.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\"                 Not Copyright ( c) 1991 
.\"
.\" Assumes tbl, eqn, MS macros, and lots of luck.
.TA 1c 2c 3c 4c 5c 6c 7c 8c
.ds CH
.ds CF
.EQ
delim @@
.EN
.nr LL 40.5P
.nr ll 40.5P
.nr HM 3P
.nr FM 6P
.nr PO 4P
.nr PD 9p
.po 4P

.rs
\v | 5i'
.sp 1P
.LP
4.5.17
	\fIKeypad facility\fR 
.sp 9p
.RT
.PP
The purpose of the Keypad facility information element is to convey IA5 
characters, e.g., entered by means of a terminal keypad. 
.EF '%	Fascicle\ VI.11\ \(em\ Rec.\ Q.931''
.OF '''Fascicle\ VI.11\ \(em\ Rec.\ Q.931	%'
.PP
The Keypad facility information element is coded as shown in
Figure\ 4\(hy25/Q.931. The default maximum length of this information element 
is 
34\ octets.
.RT
.LP
.rs
.sp 15P
.ad r
\fBFigure 4\(hy25/Q.931 [T108.931], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.sp 1P
.LP
4.5.18
	\fILow layer compatibility\fR 
.sp 9p
.RT
.PP
The purpose of the Low layer compatibility information element is to provide 
a means which should be used for compatibility checking by an addressed 
entity (e.g.,\ a remote user or an interworking unit or a high layer function 
network node addressed by the calling user). The Low layer compatibility
information element is transferred transparently by an ISDN between the call
originating entity (e.g.,\ the calling user) and the addressed entity. See
Annex\ B and Annex\ L.
.PP
If low layer compatibility negotiation is allowed by the network (see Annex\ 
M), the Low layer compatibility information element is also passed 
transparently from the addressed entity to the originating entity.
.PP
The Low layer compatibility information element is coded as shown in Figure\ 
4\(hy26/Q.931 and in Table\ 4\(hy18/Q.931. The maximum length of this 
information element is 16\ octets.
.RT
.sp 1P
.LP
4.5.19
	\fIMore data\fR 
.sp 9p
.RT
.PP
The More data information element is sent by the user to the
network in a USER INFORMATION message, and delivered by the network to the
destination user(s) in the corresponding USER INFORMATION message. The 
presence of the More data information element indicates to the destination 
user that 
another USER INFORMATION message will follow containing information
belonging to the same block.
.PP
The use of the More data information element is not supervised by the  network.
.PP
The More data information element is coded as shown in
Figure\ 4\(hy27/Q.931.
.bp
.RT
.LP
.rs
.sp 47P
.ad r
\fBFigure 4\(hy26/Q.931 [1T109.931] \ \ 
(traiter comme tableau), p. 2\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 10P
.ad r
\fBNotes de la Figure 4\(hy26/Q.931 [2T109.931] \ \ 
(traiter comme tableau),
p. 3\fR 
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T110.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 1\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
[Unable to convert Table]
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (1 de 8) [T110.931], p. 4\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T111.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 2\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIInformation transfer rate (octets 4 and 4b)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
\fICircuit mode\fR
\fIPacket\(hymode\fR
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0
\(em
This code shall be used for packet mode calls
.br
1\ \ 0\ \ 0\ \ 0\ \ 0
64 kbit/s
\(em
.br
1\ \ 0\ \ 0\ \ 0\ \ 1
2 \(mu 64 kbit/s
\(em
.br
1\ \ 0\ \ 0\ \ 1\ \ 1
384 kbit/s
\(em
.br
1\ \ 0\ \ 1\ \ 0\ \ 1
1536 kbit/s
\(em
.br
1\ \ 0\ \ 1\ \ 1\ \ 1
1920 kbit/s
\(em
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ When octet 4b is omitted, the low layer compatibility is bi\(hydirectional symmetric at the information transfer rate specified in
octet\ 4. When octet 4b is included, the information transfer rate in octet\ 4
refers to the origination \(ra destination direction.
.LP
\fINote 2\fR
\ \(em\ When the information transfer rate 2 \(mu 64 kbit/s is used, the
coding of octets 3 and 4 refer to both 64\ kbit/s channels.
 }
.T&
lw(228p) .
 {
\fIStructure (octet 4a)\fR
.LP
Bits
.br
7\ \ 6\ \ 5
.LP
0\ \ 0\ \ 0
default (see Note 1)
.br
0\ \ 0\ \ 1
8 kHz integrity (Note 2)
.br
1\ \ 0\ \ 0
service data unit integrity
.br
1\ \ 1\ \ 1
unstructured
.LP
\fINote 1\fR
\ \(em\ If octet 4a is omitted, or the structure field is coded
\*Q000\*U, then the value of the structure attribute is according to the
following:
.LP
 }
.T&
lw(228p) .
 {
\fITransfer mode\fR
\fITransfer capability\fR
\fIStructure\fR
.LP
circuit
speech
8 kHz integrity
.br
circuit
unrestricted digital
8 kHz integrity
.br
circuit
restricted digital
8 kHz integrity
.br
circuit
audio
8 kHz integrity
.br
circuit
video
8 kHz integrity
.br
packet
unrestricted digital
service data unit
integrity
\fINote 2\fR
\ \(em\ When the information transfer rate 2 \(mu 64 kbit/s is
used, 8\ kHz integrity with Restricted Differential Time Delay (RDTD) is
offered.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (2 de 8) [T111.931], p. 5\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 11P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T112.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 3\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIConfiguration (octet 4a)\fR
.LP
Bits
.br
4\ \ 3
.LP
0\ \ 0
point\(hyto\(hypoint
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ If octet 4a is omitted, the configuration is assumed to be
point\(hyto\(hypoint.
 }
.T&
lw(228p) .
 {
\fIEstablishment (octet 4a)\fR
.LP
Bits
.br
2\ \ 1
.LP
0\ \ 0
demand
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ If octet 4a is omitted, the method of establishment is
assumed to be \*Qdemand\*U.
 }
.T&
lw(228p) .
 {
\fISymmetry (octet 4b)\fR
.LP
Bits
.br
7\ \ 6
.LP
0\ \ 0
bidirectional symmetric
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ If octet 4b is omitted, bidirectional symmetric is
assumed.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (3 de 8) [T112.931], p. 6\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 22P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T113.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 4\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIUser information layer 1 protocol (octet 5)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 1
CCITT standardized rate adaption V.110 [7]/X.30 [8]. This implies the presence of octet 5a and optionally octets 5b, 5c and 5d as
defined below.
.br
0\ \ 0\ \ 0\ \ 1\ \ 0
Recommendation G.711 [10] \(*m\(hylaw
.br
0\ \ 0\ \ 0\ \ 1\ \ 1
Recommendation G.711 A\(hylaw
.br
0\ \ 0\ \ 1\ \ 0\ \ 0
Recommendation G.721 [11] 32 kbit/s ADPCM and
Recommendation I.460 [15]
.br
0\ \ 0\ \ 1\ \ 0\ \ 1
Recommendations G.722 [12] and G.725 [35] 7 kHz audio
.br
0\ \ 0\ \ 1\ \ 1\ \ 0
Recommendation H.261 [13] for 384 kbit/s video
.br
0\ \ 0\ \ 1\ \ 1\ \ 1
Non\(hyCCITT standardized rate adaption. This implies
the presence of octet 5a and, optionally, octets 5b, 5c and 5d. The use of this codepoint indicates that the user rate specified in octet 5a is defined by the user. Additionally, octet 5b, 5c and 5d, if present, are defined consistent
with the user specified rate adaption.
.br
0\ \ 1\ \ 0\ \ 0\ \ 0
CCITT standardized rate adaption V.120. This
implies the presence of octets 5a and 5b as defined below, and optionally
octets\ 5c and\ 5d.
.br
0\ \ 1\ \ 0\ \ 0\ \ 1
CCITT standardized rate adaption X.31 [14] HDLC flag
stuffing.
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ If the transfer mode is \*Qcircuit mode\*U, and if the
information transfer capability is \*Qunrestricted digital information\*U or
\*Qrestricted digital information\*U, and if the user information layer 1 protocol is not to be identified to the network, octet 5 shall be omitted. If the
transfer mode is packet mode, octet 5 may be omitted. Otherwise, octet\ 5
shall be present.
 }
.T&
lw(228p) .
 {
\fISynchronous/asynchronous (octet 5a)\fR
.LP
Bit
.br
7
.LP
0
Synchronous
.br
1
Asynchronous
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ Octets 5b\(hy5d may be omitted in case of synchronous user
rates.
 }
.T&
lw(228p) .
 {
\fINegotiation (octet 5a)\fR
.LP
Bit
.br
6
.LP
0
In\(hyband negotiation not possible
.br
1
In\(hyband negotiation possible
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ See Recommendations V.110 and X.30.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (4 de 8) [T113.931], p. 7\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 10P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T114.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 5\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIUser rate (octet 5a)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0
rate is indicated by E\(hybits specified in Recommendation
I.460
.br
0\ \ 0\ \ 0\ \ 0\ \ 1
0.6 kbit/s Recommendations V.6 [16] and X.1 [17]
.br
0\ \ 0\ \ 0\ \ 1\ \ 0
1.2 kbit/s Recommendation V.6
.br
0\ \ 0\ \ 0\ \ 1\ \ 1
2.4 kbit/s Recommendations V.6 and X.1
.br
0\ \ 0\ \ 1\ \ 0\ \ 0
3.6 kbit/s Recommendation V.6
.br
0\ \ 0\ \ 1\ \ 0\ \ 1
4.8 kbit/s Recommendations V.6 and X.1
.br
0\ \ 0\ \ 1\ \ 1\ \ 0
7.2 kbit/s Recommendation V.6
.br
0\ \ 0\ \ 1\ \ 1\ \ 1
8 kbit/s Recommendation I.460
.br
0\ \ 1\ \ 0\ \ 0\ \ 0
9.6 kbit/s Recommendations V.6 and X.1
.br
0\ \ 1\ \ 0\ \ 0\ \ 1
14.4 kbit/s Recommendation V.6
.br
0\ \ 1\ \ 0\ \ 1\ \ 0
16 kbit/s Recommendation I.460
.br
0\ \ 1\ \ 0\ \ 1\ \ 1
19.2 kbit/s Recommendation V.6
.br
0\ \ 1\ \ 1\ \ 0\ \ 0
32 kbit/s Recommendation I.460
.br
0\ \ 1\ \ 1\ \ 1\ \ 0
48 kbit/s Recommendations V.6 and X.1
.br
0\ \ 1\ \ 1\ \ 1\ \ 1
56 kbit/s Recommendation V.6
.br
1\ \ 0\ \ 1\ \ 0\ \ 1
0.1345 kbit/s Recommendation X.1
.br
1\ \ 0\ \ 1\ \ 1\ \ 0
0.100 kbit/s Recommendation X.1
.br
1\ \ 0\ \ 1\ \ 1\ \ 1
0.075/1.2 kbit/s Recommendations V.6 and X.1 (Note)
.br
1\ \ 1\ \ 0\ \ 0\ \ 0
1.2/0.075 kbit/s Recommendations V.6 and X.1 (Note)
.br
1\ \ 1\ \ 0\ \ 0\ \ 1
0.050 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 0\ \ 1\ \ 0
0.075 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 0\ \ 1\ \ 1
0.110 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 1\ \ 0\ \ 0
0.150 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 1\ \ 0\ \ 1
0.200 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 1\ \ 1\ \ 0
0.300 kbit/s Recommendations V.6 and X.1
.br
1\ \ 1\ \ 1\ \ 1\ \ 1
12 kbit/s Recommendation V.6
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ The first rate is the transmit rate in the forward direction of the call. The second rate is the transmit rate in the backward direction
of the call.
 }
.T&
lw(228p) .
 {
\fIOctet 5b for V.110 [7]/X.30 [8] rate adaption\fR
 }
.T&
lw(228p) .
 {
\fIIntermediate Rate (octet 5b)\fR
.LP
Bits
.br
7\ \ 6
.LP
0\ \ 0
Not used
.br
0\ \ 1
8 kbit/s
.br
1\ \ 0
16 kbit/s
.br
1\ \ 1
32 kbit/s
 }
.T&
lw(228p) .
 {
\fINetwork independent clock (NIC) on transmission (Tx) (octet 5b)\fR
\fI(Note 1)\fR
.LP
Bit
.br
5
.LP
0
Not required to send data with network independent clock
.br
1
Required to send data with network independent clock
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ Refers to transmission in the forward direction of
the call.
.br
\fINote 2\fR
\ \(em\ See Recommendations V.110 and X.30.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (5 de 8) [T114.931], p. 8\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T115.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 6\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fINetwork independent clock (NIC) on reception (Rx) (octet 5b) (Note 1)\fR
.LP
Bit
.br
4
.LP
0
Cannot accept data with Network Independent Clock (i.e., sender does not support this optional procedure)
.br
1
Can accept data with Network Independent Clock (i.e., sender does
support this optional procedure)
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ Refers to transmission in the backward direction of the
call
.br
\fINote 2\fR
\ \(em\ See recommendations V.110 [7] and X.30 [8].
 }
.T&
lw(228p) .
 {
\fIFlow control on transmission (Tx) (octet 5b) (Note 1)\fR
.LP
Bit
.br
3
.LP
0
Not required to send data with flow control mechanism
.br
1
Required to send data with flow control mechanism
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ Refers to transmission in the forward direction of the
call
.br
 }
.T&
lw(228p) .
 {
\fINote 2\fR
\ \(em\ See Recommendations V.110 and X.30.
 }
.T&
lw(228p) .
 {
\fIFlow control on reception (Rx) (octet 5b) (Note 1)\fR
.LP
Bit
.br
2
.LP
0
Cannot accept data with flow control mechanism (i.e., sender does not support this optional procedure)
.br
1
Can accept data with flow control mechanism (i.e., sender does
support this optional procedure)
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ Refers to transmission in the backward direction of the
call
.br
 }
.T&
lw(228p) .
 {
\fINote 2\fR
\ \(em\ See Recommendations V.110 and X.30.
 }
.T&
lw(228p) .
 {
\fIOctet 5b for V.120 [9] Rate adaption\fR
 }
.T&
lw(228p) .
 {
\fIRate adaption header/no header (octet 5b)\fR
.LP
Bit
.br
7
.LP
0
Rate adaption header not included
.br
1
Rate adaption header included
 }
.T&
lw(228p) .
 {
\fIMultiple frame establishment support in data link (octet 5b)\fR
.LP
Bit
.br
6
.LP
0
Multiple frame establishment not supported. Only UI frames allowed.
.br
1
Multiple frame establishment supported.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (6 de 8) [T115.931], p. 9\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 5P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T116.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 7\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIMode of operation (octet 5b)\fR
.LP
Bit
.br
5
.LP
0
Bit transparent mode of operation
.br
1
Protocol sensitive mode of operation
 }
.T&
lw(228p) .
 {
\fILogical link identifier negotiation (octet 5b)\fR
.LP
Bit
.br
4
.LP
0
Default, LLI = 256 only
.br
1
Full protocol negotiation (Note)
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ A connection over which protocol negotiation will be executed is indicated in bit\ 2 of octet\ 5b.
 }
.T&
lw(228p) .
 {
\fIAssignor/assignee (octet 5b)\fR
.LP
Bit
.br
3
.LP
0
Message originator is \*Qdefault assignee\*U
.br
1
Message originator is \*Qassignor only\*U
 }
.T&
lw(228p) .
 {
\fIIn\(hyband/out\(hyband negotiation (octet 5b)\fR
.LP
Bit
.br
2
.LP
0
Negotiation is done with USER INFORMATION messages on a temporary
signalling connection
.br
1
Negotiation is done in\(hyband using logical link zero.
 }
.T&
lw(228p) .
 {
\fINumber of stop bits (octet 5c)\fR
.LP
Bits
.br
7\ \ 6
.LP
0\ \ 0
Not used
.br
0\ \ 1
1 bit
.br
1\ \ 0
1.5 bits
.br
1\ \ 1
2 bits
 }
.T&
lw(228p) .
 {
\fINumber of data bits excluding parity bit if present (octet 5c)\fR
.LP
Bits
.br
5\ \ 4
.LP
0\ \ 0
Not used
.br
0\ \ 1
5 bits
.br
1\ \ 0
7 bits
.br
1\ \ 1
8 bits
 }
.T&
lw(228p) .
 {
\fIParity information (octet 5c)\fR
.LP
Bits
.br
3\ 2\ 1
.LP
0\ 0\ 0
Odd
.br
0\ 1\ 0
Even
.br
0\ 1\ 1
None
.br
1\ 0\ 0
Forced to 0
.br
1\ 0\ 1
Forced to 1
.LP
All other values are reserved.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (7 de 8) [T116.931], p. 10\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T117.931]\fR 
.ce
TABLE\ 4\(hy18/Q.931\ (Sheet\ 8\ of\ 8)
.ce
\fBLow layer compatibility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIDuplex mode (octet 5d)\fR
.LP
Bit
.br
7
.LP
0
Half duplex
.br
1
Full duplex
 }
.T&
lw(228p) .
 {
\fIModem type (octet 5d)\fR
.LP
Bits 6\(hy1 coded according to network specific rules.
 }
.T&
lw(228p) .
 {
\fIUser information layer 2 protocol (octet 6)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 1
Basic mode ISO 1745 [36]
.br
0\ \ 0\ \ 0\ \ 1\ \ 0
CCITT Recommendation Q.921 (I.441) [3]
.br
0\ \ 0\ \ 1\ \ 1\ \ 0
CCITT Recommendation X.25 [5], link layer
.br
0\ \ 0\ \ 1\ \ 1\ \ 1
CCITT Recommendation X.25 Multilink
.br
0\ \ 1\ \ 0\ \ 0\ \ 0
Extended LAPB; for half duplex operation (T.71 [37])
.br
0\ \ 1\ \ 0\ \ 0\ \ 1
HDLC ARM (ISO 4335) [38]
.br
0\ \ 1\ \ 0\ \ 1\ \ 0
HDLC NRM (ISO 4335)
.br
0\ \ 1\ \ 0\ \ 1\ \ 1
HDLC ABM (ISO 4335)
.br
0\ \ 1\ \ 1\ \ 0\ \ 0
LAN logical link control (ISO 8802/2) [39]
.LP
0\ \ 1\ \ 1\ \ 0\ \ 1
CCITT Recommentation X.75 [40]. Single Link
Procedure (SLP)
.br
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fIOptional layer 2 protocol information (octet 6a)\fR
.LP
To be defined.
 }
.T&
lw(228p) .
 {
\fIUser information layer 3 protocol (octet 7)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 1\ \ 0
CCITT Recommendation Q.931 (I.451)
.br
0\ \ 0\ \ 1\ \ 1\ \ 0
CCITT Recommendation X.25, packet layer
.br
0\ \ 0\ \ 1\ \ 1\ \ 1
ISO 8208 [41] (X.25 packet level protocol for data
terminal equipment)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0
ISO 8348 [42] (OSI connection oriented network service
specific subset of ISO 8208 and
CCITT X.25)
.br
0\ \ 1\ \ 0\ \ 0\ \ 1
ISO 8473 [43] (OSI connectionless service)
.LP
0\ \ 1\ \ 0\ \ 1\ \ 0
CCITT Recommendation T.70 [32] minimum network layer
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fIOptional layer 3 protocol information (octet 7a)\fR
.LP
To be defined.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy18/Q.931 (8 de 8) [T117.931], p. 11\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 3P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 10P
.ad r
\fBFigure 4\(hy27/Q.931 [T118.931]  \ \ 
(\*`a traiter comme tableau), p. 12\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 2
.sp 1P
.LP
4.5.20
	\fINetwork\(hyspecific facilities\fR 
.sp 9p
.RT
.PP
The purpose of the Network\(hyspecific facilities information element is 
to indicate which network facilities are being invoked. The 
Network\(hyspecific facilities information element is coded as shown in
Figure\ 4\(hy28/Q.931 and Table\ 4\(hy19/Q.931. No more than four Network\(hyspecific 
facilities information elements may be included in a single message.
.PP
The maximum length of this information element is network
dependent.
.RT
.LP
.rs
.sp 25P
.ad r
\fBFigure 4\(hy28/Q.931 [T119.931] \ \ 
(\*`a traiter comme tableau), p. 13\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T120.931]\fR 
.ce
TABLE\ 4\(hy19/Q.931
.ce
\fBNetwork\(hyspecific facilities information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fILength of network identification (octet 3)\fR
.LP
This field contains the length, in octets, of the network
identification found in octet 3.1 and the repetition of octet 3.2. If the value is \*Q0000\ 0000\*U, then the default provider (see Annex\ E, \(sc\ E.1) is assumed and octets 3.1 and 3.2 are omitted.
 }
.T&
lw(228p) .
 {
\fIType of network identification (octet 3.1)\fR
.LP
Bits
.br
7\ \ 6\ \ 5
.LP
0\ \ 0\ \ 0
user specified
.br
0\ \ 1\ \ 0
national network identification
.br
0\ \ 1\ \ 1
international network identification
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINetwork identification plan (octet 3.1)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0
unknown
.br
0\ \ 0\ \ 0\ \ 1
Carrier Identification Code (Note)
.br
0\ \ 0\ \ 1\ \ 1
Data network identification code (Recommendation X.121
[21])
.LP
All other values are reserved.
\fINote\fR
\ \(em\ Carrier Identification Codes may be an appropriate method of identifying the network serving the remote user.
 }
.T&
lw(228p) .
 {
\fINetwork identification (octets 3.2, etc.)\fR
.LP
These IA5 characters ar
e organized according to the network
identification plan specified in octet 3.1.
 }
.T&
lw(228p) .
 {
\fINetwork\(hyspecific facilities (octets 4, etc.)\fR
.LP
This field is encoded acc
ording to the rules specified by the
identified network.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy19/Q.931 [T120.931], p. 14\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 16P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.21
	\fINotification indicator\fR 
.sp 9p
.RT
.PP
The purpose of the Notification indicator
information element is to indicate information pertaining to a call.
.PP
The Notification indicator information element is coded as shown in
Figure\ 4\(hy29/Q.931 and Table\ 4\(hy20/Q.931. The maximum length of this
information element is 3\ octets.
.RT
.LP
.rs
.sp 15P
.ad r
\fBFigure 4\(hy29/Q.931 [T121.931] \ \ 
(\*`a traiter comme tableau), p. 15\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.ce
\fBH.T. [T122.931]\fR 
.ce
TABLE\ 4\(hy20/Q.931
.ce
\fBNotification indicator information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(132p) .
 {
\fINotification description (octet 3)\fR
.LP
Bits
.br
7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
user suspended
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
user resumed
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
bearer service change
.LP
All other values are reserved.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy20/Q.931 [T122.931], p. 16\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 6P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.22
	\fIProgress indicator\fR 
.sp 9p
.RT
.PP
The purpose of the Progress indicator information element is to
describe an event which has occurred during the life of a call. The information 
element may occur two times in a message. 
.PP
The Progress indicator information element is coded as shown in
Figure\ 4\(hy30/Q.931 and Table\ 4\(hy21/Q.931. The default maximum length 
of this 
information element is 4\ octets.
.RT
.LP
.rs
.sp 18P
.ad r
\fBFigure 4\(hy30/Q.931 [T123.931] \ \ 
(\*`a traiter comme tableau), p. 17\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 24P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T124.931]\fR 
.ce
TABLE\ 4\(hy21/Q.931
.ce
\fBProgress indicator information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fICoding standard (octet 3)\fR
.LP
Bits
.br
7\ \ 6
.LP
0\ \ 0
CCITT standardized coding, as described below
.br
0\ \ 1
reserved for other international standards (Note)
.br
1\ \ 0
national standard (Note)
.br
1\ \ 1
standard specific to identified location (Note)
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ These other coding standards should be used only when
the desired progress indication cannot be represented with the
CCITT\(hystandardized coding.
 }
.T&
lw(228p) .
 {
\fILocation (octet 3)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0
user
.br
0\ \ 0\ \ 0\ \ 1
private network serving the local user
.br
0\ \ 0\ \ 1\ \ 0
public network serving the local user
.br
0\ \ 1\ \ 0\ \ 0
public network serving the remote user
.br
0\ \ 1\ \ 0\ \ 1
private network serving the remote user
.br
1\ \ 0\ \ 1\ \ 0
network beyond interworking point
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ Depending on the location of the users, the local public network and remote public network may be the same network.
 }
.T&
lw(228p) .
 {
\fIProgress description (octet 4)\fR
.LP
Bits
.br
7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
No.
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
1
Call is not end\(hyto\(hyend ISDN, further call
progress information may be available in\(hyband
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
2
Destination address is non\(hyISDN
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1
3
Origination address is non\(hyISDN
.br
0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0
4
Call has returned to the ISDN
.br
0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0\ \ 0
8
In\(hyband information or appropriate pattern
now available
.LP
All other values are reserved.
\fINote\fR
\ \(em\ The use of the different progress descriptions is further
explained in Annex\ I.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy21/Q.931 [T124.931], p. 18\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 11P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.23
	\fIRepeat indicator\fR 
.sp 9p
.RT
.PP
The purpose of the Repeat indicator information element is to
indicate how repeated information elements shall be interpreted, when included 
in a message. The Repeat indicator information element is included before 
the first occurence of the information element which will be repeated in 
a message. The Repeat indication information element is coded as shown 
in 
Figure\ 4\(hy31/Q.931 and Table\ 4\(hy22/Q.931.
.PP
\fINote\fR \ \(em\ Use of the Repeat indication information element in
conjunction with an information element that occurs only once in a message
shall not of itself constitute an error.
.RT
.LP
.rs
.sp 11P
.ad r
\fBFigure 4\(hy31/Q.931 [T125.931] \ \ 
(\*`a traiter comme tableau), p. 19\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.ce
\fBH.T. [T126.931]\fR 
.ce
TABLE\ 4\(hy22/Q.931
.ce
\fBRepeat indicator information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIRepeat indication (octet 1)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 1\ \ 0
Prioritized list for selecting one possibility (Note)
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ Used for Bearer service change procedures (see
Annex\ O).
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy22/Q.931 [T126.931], p. 20\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 6P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.24
	\fIRestart indicator\fR 
.sp 9p
.RT
.PP
The purpose of the Restart indicator information element is to
identify the class of the facility (i.e.,\ channel or interface) to be
restarted.
.PP
The Restart indicator information element is coded as shown in
Figure\ 4\(hy32/Q.931 and Table\ 4\(hy23/Q.931. The maximum length of this 
information element is 3\ octets. 
.RT
.LP
.rs
.sp 15P
.ad r
\fBFigure 4\(hy32/Q.931 [T127.931] \ \ 
(\*`a traiter comme tableau), p. 21\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.ce
\fBH.T. [T128.931]\fR 
.ce
TABLE\ 4\(hy23/Q.931
.ce
\fBRestart indicator information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIClass (octet 3)\fR
.LP
Bits
.br
3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0
Indicated channels (Note 1)
.br
1\ \ 1\ \ 0
Single interface (Note 2)
.br
1\ \ 1\ \ 1
All interfaces
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ The channel identification information element must be included and indicates which channels are to be restarted.
.LP
\fINote 2\fR
\ \(em\ If non\(hyassociated signalling is used, the channel identification information element must be included to indicate the interface to be restarted if it is other than the one on which the D\(hychannel is
present.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy23/Q.931 [T128.931], p. 22\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 3P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.25
	\fISegmented message\fR 
.sp 9p
.RT
.PP
The purpose of the Segmented message information element is to
indicate that the transmission in which it appears is part of a segmented
message, in addition to the use of message type SEGMENT. When included in a
message segment, it appears directly after the message type information
element (see Annex\ K).
.PP
The Segmented message information element is coded as shown in
Figure\ 4\(hy33/Q.931 and Table\ 4\(hy24/Q.931.
.RT
.LP
.rs
.sp 18P
.ad r
\fBFigure 4\(hy33/Q.931 [T129.931] \ \ 
(\*`a traiter comme tableau), p. 23\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 2
.ce
\fBH.T. [T130.931]\fR 
.ce
TABLE\ 4\(hy24/Q.931
.ce
\fBSegmented message information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIFirst segment indicator (octet 3)\fR
.LP
Bit
.br
8
.LP
0
Subsequent segment to first segment
.br
1
First segment of segmented message
 }
.T&
lw(228p) .
 {
\fINumber of segments remaining (octet 3)\fR
.LP
Binary number indicating the number of remaining segments within the
message to be sent.
 }
.T&
lw(228p) .
 {
\fISegmented message type (octet 4)\fR
.LP
Type of message being segmented coded as per \(sc\ 4.4.
.LP
\fINote\fR
\ \(em\ Bit 8 is reserved for possible future use as an extension
bit.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy24/Q.931 [T130.931], p. 24\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.26
	\fISending complete\fR 
.sp 9p
.RT
.PP
The purpose of the Sending complete information element is to
optionally indicate completion of called party number, see \(sc\(sc\ 5.1.3, 
5.2.1 
and\ 5.2.4.
.PP
It is a single octet information element coded as shown in
Figure\ 4\(hy34/Q.931.
.RT
.LP
.rs
.sp 10P
.ad r
\fBFigure 4\(hy34/Q.931 [T131.931] \ \ 
(\*`a traiter comme tableau), p. 25\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 3
.sp 1P
.LP
4.5.27
	\fISignal\fR 
.sp 9p
.RT
.PP
The purpose of the Signal information element is to allow the
network to optionally convey information to a user regarding tones and
alerting signals. (See\ \(sc\(sc\ 7 and\ 8.)
.PP
The Signal information element is coded as shown in Figure 4\(hy35/Q.931 
and Table\ 4\(hy25/Q.931. The length of this information element is 3\ 
octets. 
.PP
The Signal information element may be repeated in a message.
.RT
.LP
.rs
.sp 15P
.ad r
\fBFigure 4\(hy35/Q.931 [T132.931] \ \ 
(\*`a traiter comme tableau), p. 26\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T133.931]\fR 
.ce
TABLE\ 4\(hy25/Q.931
.ce
\fBSignal information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fISignal value (octet 3)\fR
.LP
Bits
.br
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
dial tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
ring back tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
intercept tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1
network congestion tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0
busy tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 1
confirm tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1\ \ 0
answer tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1\ \ 1
call waiting tone on
.br
0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0\ \ 0
off\(hyhook warning tone on
.br
0\ \ 0\ \ 1\ \ 1\ \ 1\ \ 1\ \ 1\ \ 1
tones off
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
alerting on \(em pattern 0 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
alerting on \(em pattern 1 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
alerting on \(em pattern 2 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1
alerting on \(em pattern 3 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0
alerting on \(em pattern 4 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 1
alerting on \(em pattern 5 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1\ \ 0
alerting on \(em pattern 6 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1\ \ 1
alerting on \(em pattern 7 (Note)
.br
0\ \ 1\ \ 0\ \ 0\ \ 1\ \ 1\ \ 1\ \ 1
alerting off
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ The use of these patterns is
network\(hydependent.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy25/Q.931 [T133.931], p. 27\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 22P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.28
	\fITransit network selection\fR 
.sp 9p
.RT
.PP
The purpose of the Transit network selection information element
is to identify one requested transit network. The Transit network selection
information element may be repeated in a message to select a sequence of
transit networks through which a call must pass. See Annex\ C.
.PP
The Transit network selection information element is coded as shown
in Figure\ 4\(hy36/Q.931 and Table\ 4\(hy26/Q.931. The default maximum 
length of this information element is network dependent. 
.RT
.LP
.rs
.sp 17P
.ad r
\fBFigure 4\(hy36/Q.931 [T134.931] \ \ 
(\*`a traiter comme tableau), p. 28\fR 
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T135.931]\fR 
.ce
TABLE\ 4\(hy26/Q.931
.ce
\fBTransit network selection information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIType of network identification (octet 3)\fR
.LP
Bits
.br
7\ \ 6\ \ 5
.LP
0\ \ 0\ \ 0
user specified
.br
0\ \ 1\ \ 0
national network identification
.br
0\ \ 1\ \ 1
international network identification
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINetwork identification plan (octet 3)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0
unknown
.br
0\ \ 0\ \ 0\ \ 1
Carrier Identification Code (Note)
.br
0\ \ 0\ \ 1\ \ 1
Data network identification code (Recommendation
X.121) [21]
.LP
All other values are reserved.
\fINote\fR
\ \(em\ Carrier Identification Codes may be an appropriate method of identifying the network serving the remote user.
 }
.T&
lw(228p) .
 {
\fINetwork identification (octet 4)\fR
.LP
These IA5 characters ar
e organized according to the network
identification plan specified in octet 3.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy26/Q.931 [T135.931], p. 29\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.5.29
	\fIUser\(hyuser\fR 
.sp 9p
.RT
.PP
The purpose of the User\(hyuser information element is to convey
information between ISDN users. This information is not interpreted by the
network, but rather is carried transparently and delivered to the remote
user(s).
.PP
The User\(hyuser information element is coded as shown in
Figure\ 4\(hy37/Q.931 and Table\ 4\(hy27/Q.931. There are no restrictions 
on the 
content of the user information field.
.PP
In SETUP, ALERTING, CONNECT, DISCONNECT, RELEASE and RELEASE COMPLETE messages, 
the User\(hyuser information element has a network dependent maximum 
size of 35 or 131 octets. The evolution to a single maximum value is the 
long term objective; the exact maximum value is the subject of further 
study. 
.PP
In USER INFORMATION messages sent in association with a circuit\(hymode 
connection, the User\(hyuser information element has a network dependent 
maximum size of 35 or 131\ octets. For USER INFORMATION messages sent in 
a temporary or permanent user\(hyuser signalling connection, the user information 
field contained inside this information element has a maximum size equal 
to the maximum size of messages defined in \(sc\ 3, that is 260\ octets. 
.PP
\fINote\fR \ \(em\ The User\(hyuser information element is transported
transparently by an ISDN between a call originating entity, e.g.,\ a calling
user and the addressed entity, e.g.,\ a remote user or a high layer function
network node addressed by the call originating entity.
.RT
.LP
.rs
.sp 17P
.ad r
\fBFigure 4\(hy37/Q.931 [T136.931] \ \ 
(\*`a traiter comme tableau), p. 30\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 13P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T137.931]\fR 
.ce
TABLE\ 4\(hy27/Q.931
.ce
\fBUser\(hyuser information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIProtocol discriminator (octet 3)\fR
.LP
Bits
through |
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
User\(hyspecific protocol (Note 1)
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
OSI high layer protocols
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
X.244 [44] (Note 2)
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1
Reserved for system management convergence function
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0
IA5 characters (Note 4)
through |
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1\ \ 1
Rec. V.120 [9] rate adaption
through |
0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0\ \ 0\ \ 0
Q.931 (I.451) user\(hynetwork call control messages
reserved for other network layer or layer\ 3
protocols, including Recommendation\ X.25 [5].
(Note 3)
through |
@ pile { { \~\~0\~\~0\~\~1\~\~0\~\~0\~\~0\~\~0 } above { 0\~\~0\~\~1\~\~1\~\~1\~\~1\~\~1\~\~1 } } @ 
$$ }
through | 
$$fo0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
} above { 0\ \ 1\ \ 0\ \ 0\ \ 1\ \ 1\ \ 1\ \ 1
$$fe
$$ }
national use.
reserved for other network layer or layer\ 3
protocols, including
Recommendation\ X.25.
(Note 3)
through |
$$fo0\ \ 1\ \ 0\ \ 1\ \ 0\ \ 0\ \ 0\ \ 0
} above { 1\ \ 1\ \ 1\ \ 1\ \ 1\ \ 1\ \ 1\ \ 0
$$fe
$$ }
 }
.T&
lw(228p) .
 {
through |
All other values are reserved.
\fINote 1\fR
\ \(em\ The user information is structured according to user needs.
.LP
\fINote 2\fR
\ \(em\ The user information is structured according to Rec. X.244 which
specifies the structure of X.25 call user data.
.LP
\fINote 3\fR
\ \(em\ These values are reserved to discriminate these protocol
discriminators from the first octet of a Rec. X.25 packet including general
format identifier.
.LP
\fINote 4\fR
\ \(em\ The user information consists of IA5 characters.
.LP
 }
.TE
.nr PS 9
.RT
.ad r
luster
\fBTableau 4\(hy27/Q.931 [T137.931], p. 31\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 14P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 2P
.LP
4.6
	\fISupplementary services information elements\fR 
.sp 1P
.RT
.sp 1P
.LP
4.6.1
	\fIDate/time\fR 
.sp 9p
.RT
.PP
The purpose of the Date/time information element is to provide the date 
and time to the user. It indicates the point in time when the message 
has been generated by the network.
.PP
\fINote\fR \ \(em\ It is a network dependent matter whether the time indicated 
is local time or Coordinated Universal Time\ (UTC) and which calender is 
used 
for referencing the date.
.PP
The Date/time information element is coded as shown in
Figure\ 4\(hy38/Q.931. Octets\ 3\(hy8 are binary coded (bit\ 1 being the least
significant bit).
.RT
.LP
.rs
.sp 24P
.ad r
\fBFigure 4\(hy38/Q.931 [T138.931] \ \ 
(\*`a traiter comme tableau), p. 32\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 15P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.2
	\fIFacility\fR 
.sp 9p
.RT
.PP
The purpose of the Facility information element is to indicate the invocation 
and operation of supplementary services, identified by the 
corresponding operation value within the Facility information element. The
Facility information element is defined in Figures\ 4\(hy39/Q.931 to\ 4\(hy43/Q.931 
and Tables\ 4\(hy28/Q.931 to 4\(hy33/Q.931. 
.PP
\fINote\fR \ \(em\ The generic structure and codepoints for the Facility
information element are defined in Recommendation\ Q.932. This section 
contains only the coding required for procedures described in \(sc\ 7 of 
this 
Recommendation.
.PP
The Facility information element may be repeated in a given message.
.PP
The maximum length of the Facility information element is application dependent 
consistent with the maximum length of the message. 
.RT
.LP
.rs
.sp 25P
.ad r
\fBFigure 4\(hy39/Q.931 [T139.931] \ \ 
(\*`a traiter comme tableau), p. 33\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 13P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T140.931]\fR 
.ce
TABLE\ 4\(hy28/Q.931
.ce
\fBFacility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIService discriminator (octet 3)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
1\ \ 0\ \ 0\ \ 0\ \ 1
supplementary service applications
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIClass (octet 4)\fR
.LP
Bits
.br
8\ \ 7
.LP
1\ \ 0
context\(hyspecific
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIForm (octet 4)\fR
.LP
Bits
.br
6
.LP
1
constructor
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIComponent tag (octet 4)\fR
.LP
Bits
.br
5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 1
invoke
.br
0\ \ 0\ \ 0\ \ 1\ \ 0
return result
.br
0\ \ 0\ \ 0\ \ 1\ \ 1
return error
.br
0\ \ 0\ \ 1\ \ 0\ \ 0
reject
 }
.T&
lw(228p) .
 {
\fILength format (octet 5)\fR
.LP
Bits
.br
8
.LP
0
length of the component length field is one octet
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength of component (octet 5 bits 7\(hy1)\fR
.LP
This field indicates the total length of the contents of the component field (i.e., octet 6 and its subparts). It is the binary coding of the
number of octets of the component, with bit 1 as the least significant
bit (2\u0\d).
 }
.T&
lw(228p) .
 {
\fIComponent (octet 6)\fR
.LP
The structure of the component field varies, according to the
specific component indicated in the component tag field. See the
remainder of \(sc 4.6.2.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy28/Q.931 [T140.931], p. 34\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 5P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T141.931]\fR 
.ce
TABLE\ 4\(hy29/Q.931
.ce
\fBAbstract Syntax Notation 1 (ASN.1) representation of user\(hyuser
.ce
information\fR 
.ce
\fBservice components\fR 
.T&
lw(60p) | lw(12p) | lw(156p) .
OPERATION		User\(hyUser\(hyService
.T&
lw(60p) | cw(12p) | lw(156p) .
Argument	::=	SEQUENCE (Service, Preferred)
.T&
lw(60p) | cw(12p) | lw(156p) .
Result	::=	empty
.T&
lw(60p) | cw(12p) | lw(156p) .
Errors	::=	Not Supported
.T&
lw(60p) | cw(12p) | lw(156p) .
::=1		
.T&
lw(60p) | cw(12p) | lw(156p) .
Service	::=	 {
[1]\ IMPLICIT INTEGER\ { ervice1 (1),
[1]\ IMPLICIT INTEGER
\ Service2 (2),
[1]\ IMPLICIT INTEGER
\ Service3 (3 }
 }
.T&
lw(60p) | cw(12p) | lw(156p) .
Preferred	::=	 {
[2]\ IMPLICIT BOOLEAN\ { es (TRUE),
[2]\ IMPLICIT BOOLEAN
\ No (FALSE) }
 }
.T&
lw(60p) | cw(12p) | lw(156p) .
ERROR Not Supported		
.T&
lw(60p) | cw(12p) | lw(156p) .
Parameter	::=	empty
.T&
lw(60p) | cw(12p) | lw(156p) .
::= 1		
.T&
lw(228p) .
 {
\fINote\fR
: See Recommendations X.208 and X.209 for a complete definition
of ASN.1.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy29/Q.931 [T141.931], p. 35\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 28P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.2.1
	\fIInvoke component\fR 
.sp 9p
.RT
.PP
The invoke component is used to request the indicated supplementary service.
.PP
The invoke component is coded as shown in Figure 4\(hy40/Q.931.
.PP
The length of the invoke component is 14\ octets.
.RT
.LP
.rs
.sp 31P
.ad r
\fBFigure 4\(hy40/Q.931 [T142.931] \ \ 
(\*`a traiter comme tableau), p. 36\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 11P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T143.931]\fR 
.ce
TABLE\ 4\(hy30/Q.931\ (Sheet\ 1\ of\ 2) 
.ce
\fBInvoke component within facility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIClass (octet 6 and 6.3)\fR
.LP
Bits
.br
8\ \ 7
.LP
0\ \ 0
universal
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIForm (octet 6 and 6.3)\fR
.LP
Bit
.br
6
.LP
0
primitive
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength format (octet 6.1 and 6.4)\fR
.LP
Bits
.br
8
.LP
0
length is one octet
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength of invoke identifier (octet 6.1 bits 7\(hy1)\fR
.LP
This field indicates the total length of the contents of invoke
identifier field (i.e., octet 6.2). It is the binary coding of the
number of the octets of the invoke identifier, with bit 1 as the
least significant bit (2\u0\d).
 }
.T&
lw(228p) .
 {
\fIInvoke identifier (octet 6.2)\fR
.LP
This field contains a unique identification used to identify the
requests of a supplementary service and is used to correlate this
request with the corresponding replies.
 }
.T&
lw(228p) .
 {
\fILength of operation value (octet 6.4 bits 7\(hy1)\fR
.LP
This field indicates the total length of the contents of the operation value field (i.e., octet 6.5). It is the binary coding of the number
of octets of the operation value, with bit 1 as the least significant
bit (2\u0\d). At the present time only single octet operation values have
been defined.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy30/Q.931 (1 de 2) [T143.931], p. 37\fR 
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T144.931]\fR 
.ce
TABLE\ 4\(hy30/Q.931\ (Sheet\ 2\ of\ 2) 
.ce
\fBInvoke component within facility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIOperation value (octet 6.5)\fR
.LP
Bits
.br
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
user\(hyuser information
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIOperation\(hyspecific fields (octet 6.6, etc.)\fR
.LP
Each operation value may have a number of associated fields. These
fields vary from operation to operation value. See the remainder of
\(sc\ 4.6.2.1.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy30/Q.931 (2 de 2) [T144.931], p. 38\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.2.1.1
	\fIOperation\(hyspecific fields for user\(hyuser information\fR 
\fIsupplementary service\fR 
.sp 9p
.RT
.PP
The user\(hyuser information supplementary service operation\(hyspecific 
fields within the invoke component of the Facility information element 
are used to indicate details of the requested user\(hyuser information 
supplementary 
service.
.PP
These fields are coded as shown in Figure 4\(hy41/Q.931 and
Table\ 4\(hy31/Q.931.
.PP
The length of these fields is 6 octets.
.RT
.LP
.rs
.sp 30P
.ad r
\fBFigure 4\(hy41/Q.931 [T145.931] \ \ 
(\*`a traiter comme tableau), p. 39\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 9P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T146.931]\fR 
.ce
TABLE\ 4\(hy31/Q.931\ (Sheet\ 1\ of\ 2)
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIClass (octets 6.6, 6.8 and 6.8.3)\fR
.LP
Bits
.br
8\ \ 7
.LP
0\ \ 0
universal
.br
1\ \ 0
context\(hyspecific
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIForm (octet 6 and 6.3)\fR
.LP
Bit
.br
6
.LP
0
primitive
.br
1
constructor
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength format (octet 6.1 and 6.4)\fR
.LP
Bit
.br
8
.LP
0
length is one octet
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength of sequence (octet 6.7, bits 7\(hy1)\fR
.LP
This field indicates the total length of the following sequence of
field (i.e., octet 6.8 and its subparts). It is the binary coding
of the number of octets of the service, with bit 1 as the least significant
bit (2\u0\d).
 }
.T&
lw(228p) .
 {
\fILength of service (octet 6.8.1, bits 7\(hy1)\fR
.LP
This field indicates the total length of the contents of the service
field (i.e., octet 6.8.2). It is the binary coding of the number of
octet of the service, with bit 1 as the least significant bit (2\u0\d).
At the present time, only single octet service values have been
defined.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy31/Q.931 (1 de 2) [T146.931], p. 40\fR 
.ad b
.RT
.LP
\-v'1P'
.ce
\fBH.T. [T147.931]\fR 
.ce
TABLE\ 4\(hy31/Q.931\ (Sheet\ 2\ of\ 2)
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIService (octet 6.8.2) (Note)\fR
.LP
Bits
.br
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
Service 1
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 0
Service 2
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1\ \ 1
Service 3
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ The meaning of user\(hyuser information supplementary
services 1, 2, and 3 are defined in Recommen\(hy 
dation\ I.257A.
 }
.T&
lw(228p) .
 {
\fILength of preferred (octet 6.8.4)\fR
.LP
This field indicates the total length of the preferred field (i.e.,
octet 6.8.5). It is the binary coding of the number 
of\ octets of the
preferred field with bit 1 as the least significant field (2\u0\d). At
the present time, only single octet preferred values have been
defined.
 }
.T&
lw(228p) .
 {
\fIPreferred (octet 6.8.5)\fR
.LP
Bits
.br
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0
False (service is required)
.br
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
True (service is preferred)
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable 4\(hy31/Q.931 [T147.931], p.\fR 
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.2.2
	\fIReturn result component\fR 
.sp 9p
.RT
.PP
The return result component enables the performing entity to
provide a positive reply to a successfully performed operation to the invoking 
entity. 
.PP
The return result component is coded as shown in
Figure\ 4\(hy42/Q.931.
.RT
.LP
.rs
.sp 23P
.ad r
\fBFigure 4\(hy42/Q.931 [T148.931] \ \ 
(\*`a traiter comme tableau), p. 42\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 17P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T149.931]\fR 
.ce
TABLE\ 4\(hy32/Q.931 
.ce
\fBReturn result component within facility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIClass (octet 6)\fR
.LP
Bits
.br
8\ \ 7
.LP
0\ \ 0
universal
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIForm (octet 6)\fR
.LP
Bits
.br
6
.LP
0
primitive
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength format (octet 6.1)\fR
.LP
Bits
.br
8
.LP
0
length is one octet
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength of invoke identifier (octet 6.1 bit 7\(hy1)\fR
.LP
This field indicates the total length of the contents of invoke
identifier field (i.e., octet 6.2). It is the binary coding 
of\ the
number of the octets of the invoke identifier, with bit 1 as the
least significant bit (2\u0\d).
 }
.T&
lw(228p) .
 {
\fIInvoke identifier (octet 6.2)\fR
.LP
This field is used to correlate the positive response to the
supplementary service requested by the invoking entity.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy32/Q.931 [T149.931], p. 43\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 18P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.2.3
	\fIReturn error component\fR 
.sp 9p
.RT
.PP
The return error component enables the performing entity to return the 
negative reply to the invoking entity. 
.PP
The return error component is coded as shown in
Figure\ 4\(hy43/Q.931.
.RT
.LP
.rs
.sp 30P
.ad r
\fBFigure 4\(hy43/Q.931 [T150.931] \ \ 
(\*`a traiter comme tableau), p. 44\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 12P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T151.931]\fR 
.ce
TABLE\ 4\(hy33/Q.931 
.ce
\fBReturn error component within facility information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIClass (octets 6 and 6.3)\fR
.LP
Bits
.br
8\ \ 7
.LP
0\ \ 0
universal
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fIForm (octet 6 and 6.3)\fR
.LP
Bits
.br
6
.LP
0
primitive
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength format (octet 6.1 and 6.4)\fR
.LP
Bits
.br
8
.LP
0
length is one octet
.LP
All other values reserved.
 }
.T&
lw(228p) .
 {
\fILength of invoke identifier (octet 6.1 bit 7\(hy1)\fR
.LP
This field indicates the total length of the contents of invoke
identifier field (i.e., octet 6.2). It is the binary coding 
of\ the
number of the octets of the invoke identifier, with bit 1 as the
least significant bit (2\u0\d).
 }
.T&
lw(228p) .
 {
\fIInvoke identifier (octet 6.2)\fR
.LP
This field is used to correlate the negative response to the
supplementary service requested by the invoking entity.
 }
.T&
lw(228p) .
 {
\fILength of error value (octet 6.4, bits 7\(hy1)\fR
.LP
This field indicates the total length of the contents of the error
value field (i.e., octet 6.5). It is the binary coding 
of\ the number of
octets
of the service, with bit 1 as the least significant bit (2\u0\d). At the present time only a single 
octet\ error value has been defined.
 }
.T&
lw(228p) .
 {
\fIError value (octets 6.5)\fR
.LP
Bits
.br
8\ \ 7\ \ 6\ \ 5\ \ 4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 0\ \ 1
not supported
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy33/Q.931 [T151.931], p. 45\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 14P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.6.3
	\fIFeature activation\fR 
.sp 9p
.RT
.PP
This information element is defined in
Recommendation\ Q.932\ [4].
.RT
.sp 1P
.LP
4.6.4
	\fIFeature indication\fR 
.sp 9p
.RT
.PP
This information element is defined in
Recommendation\ Q.932\ [4].
.RT
.sp 1P
.LP
4.6.5
	\fISwitchhook\fR 
.sp 9p
.RT
.PP
The purpose of the Switchhook information element is to indicate
the status of the terminal switchhook to the network for use in supplementary 
services. 
.PP
The Switchhook information element is coded as shown in
Figure 4\(hy44/Q.931 and Table\ 4\(hy34/Q.931. The length of this information 
element is 3\ octets. 
.RT
.LP
.rs
.sp 17P
.ad r
\fBFigure 4\(hy44/Q.931 [T152.931] \ \ 
(\*`a traiter comme tableau), p. 46\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 2
.ce
\fBH.T. [T153.931]\fR 
.ce
TABLE\ 4\(hy34/Q.931
.ce
\fBSwitchhook information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(132p) .
 {
\fISwitchhook value (octet 3)\fR
.LP
bit
.br
1
.LP
0\ \ \ on\(hyhook
.br
1\ \ \ off\(hyhook
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy34/Q.931 [T153.931], p. 47\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
4.7
	\fIInformation elements for packet communications\fR 
.sp 1P
.RT
.PP
The information elements defined below are intented to be used in the support 
of packet communications as described in \(sc\ 6 and 
Recommendation\ X.31\ [14].
.PP
The use of these information elements for out\(hyof\(hyband call control 
for packet calls is for further study. 
.RT
.sp 1P
.LP
4.7.1
	\fIInformation rate\fR 
.sp 9p
.RT
.PP
The purpose of the Information rate information element is to notify the 
terminating user of the throughput indicated by the incoming 
Recommendation\ X.25\ [5] call request packet.
.PP
The Information rate information element is coded as shown in
Figure 4\(hy45/Q.931 and Tables\ 4\(hy35/Q.931 and\ 4\(hy36/Q.931.
.PP
The maximum length of this information element is 6 octets.
.RT
.LP
.rs
.sp 31P
.ad r
\fBFigure 4\(hy45/Q.931 [T154.931] \ \ 
(\*`a traiter comme tableau), p. 48\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 2P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T155.931]\fR 
.ce
TABLE\ 4\(hy35/Q.931
.ce
\fBInformation rate information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIIncoming/outgoing information rate (octets 3 and 4)\fR
.LP
The incoming outgoing information rate fields are used to indicate the information rate in the direction network to user, and user to network
respectively.
.LP
The information rate for the direction of data transmission from the
calling DTE is indicated in bits\ 5, 4, 3, 2 and\ 1 of octet\ 3. The information rate for the direction of data transmission from the called DTE is indicated in bits\ 5, 4, 3, 2 and\ 1 of octet\ 4. The bits are coded as specified in
Table\ 4\(hy36/Q.931.
 }
.T&
lw(228p) .
 {
\fIMinimum incoming/outgoing information rate (octets 5 and 6)\fR
.LP
The minimum information rate for the direction of data transmission
from the calling DTE is indicated in bits 5, 4, 3, 2 and 1 of octet 5.
The minimum information rate for the direction of data transmission from
the called DTE is indicated in bits 5, 4, 3, 2 and 1 of octet 6.
The bits are encoded as specified in Table 4\(hy36/Q.931.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy35/Q.931 [T155.931], p. 49\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.ce
\fBH.T. [T156.931]\fR 
.ce
TABLE\ 4\(hy36/Q.931
.ce
\fBThroughput class coding\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(18p) sw(18p) sw(18p) sw(18p) sw(18p) | cw(90p) , c | c | c | c | c | ^ .
Bits	Throughput class  (bit/s)
5	4	3	2	1
_
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	0	0	0	Reserved
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	0	0	1	Reserved
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	0	1	0	Reserved
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	0	1	1	75
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	1	0	0	150
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	1	0	1	300
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	1	1	0	600
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	0	1	1	1	1200
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	0	0	0	2400
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	0	0	1	4800
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	0	1	0	9600
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	0	1	1	19200
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	1	0	0	48000
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	1	0	1	Reserved
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	1	1	0	Reserved
.T&
cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(90p) .
0	1	1	1	1	Reserved
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy36/Q.931 [T156.931], p. 50\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.2
	\fIEnd\(hyto\(hyend transit delay\fR 
.sp 9p
.RT
.PP
The purpose of the End\(hyto\(hyend transit delay information element is 
to request and indicate the nominal maximum permissible transit delay applicable 
on a per call basis to that virtual call. 
.PP
The End\(hyto\(hyend transit delay is coded as shown in
Figure\ 4\(hy46/Q.931 and Table\ 4\(hy37/Q.931.
.PP
The maximum length of this information element is 11 octets.
.RT
.LP
.rs
.sp 42P
.ad r
\fBFigure 4\(hy46/Q.931 [T157.931] \ \ 
(\*`a traiter comme tableau), p. 51\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T158.931]\fR 
.ce
TABLE\ 4\(hy37/Q.931
.ce
\fBEnd\(hyto\(hyend transit delay information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fICumulative transit delay value [octet 3 (bits 1\(hy2) octets 3a and 3b]\fR
.LP
Cumulative transit delay value binary enco
ded in milleseconds. Bit 2 of octet 3 is the highest order bit and bit 1 of octet 3b is the lowest order bit. The cumulative transit delay value occupies 16 bits total.
 }
.T&
lw(228p) .
 {
\fIRequested end\(hyto\(hyend transit delay value [octet 4 (bits 1\(hy2) octets 4a\fR
\fIand 4b]\fR
.LP
Requested en\(hyto\(hyend transit delay value binary enco
ded in
milleseconds. Bit 2 of octet 4 is the highest order bit and bit 1 of octet 4b is the lowest order bit. The requested end\(hyto\(hyend transit delay value occupies 16 bits total.
 }
.T&
lw(228p) .
 {
\fIMaximum end\(hyto\(hyend transit delay value [octet 5 (bits 1\(hy2) octets 5a\fR
\fIand 5b]\fR
.LP
Maximum end\(hyto\(hyend transit delay value binary enco
ded in
milleseconds. Bit 2 of octet 5 is the highest order bit and bit 1 of octet 5b is the lowest order bit. The maximum end\(hyto\(hyend transit delay value occupies 16 bits total.
.LP
\fINote\fR
\ \(em\ For a Recommendation X.31 typ
e of access to an ISDN the
procedures only apply in the notification phase at the terminating exchange. 
At the terminating exchange, if the End\(hyto\(hyEnd Transit Delay 
facility is present in the X.25[5] incoming call request packet, the 
contents should be copied into End\(hyto\(hyend transit delay information 
element as follows:
.LP
i)
The cumulative transit delay field (octets 3 and 4) of the
X.25
end\(hyto\(hyend transit delay facility should be copied into octets 3, 3a and\ 3b.
The bit order should be preserved as described above in the description.
.LP
ii)
If octets 5 and 6 are present in the X.25 end\(hyto\(hyend transit delay 
facility, they should be interpreted as the requested end\(hyto\(hyend transit 
delay value. The value present should be copied into octets 4, 4a and\ 
4b. The bit order should be preserved as described above in the description.
.LP
iii)
If octets 7 and 8 are present in the X.25 end\(hyto\(hyend
transit delay facility, the value present is the minimum end\(hyto\(hyend transit
delay allowed. Octets 7 and 8 should be copied into octets 5, 5a and\ 5b. The
bit order should be preserved as described above in the
description.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy37/Q.931 [T158.931], p. 52\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 18P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.3
	\fIPacket layer binary parameters\fR 
.sp 9p
.RT
.PP
The purpose of the Packet layer binary parameters information
element is to indicate requested layer\ 3 parameter values to be used for the
call.
.PP
The Packet layer binary parameters information element is coded as
shown in Figure\ 4\(hy47/Q.931 and Table\ 4\(hy38/Q.931.
.PP
The maximum length of this information element is 3 octets.
.RT
.LP
.rs
.sp 15P
.ad r
\fBFigure 4\(hy47/Q.931 [T159.931] \ \ 
(\*`a traiter comme tableau), p. 53\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 26P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T160.931]\fR 
.ce
TABLE\ 4\(hy38/Q.931
.ce
\fBPacket layer binary parameters information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(132p) .
 {
\fIFast select (octet 3)\fR
.LP
Bit
.br
5\ \ 4
.LP
$$fo0\ \ 0
} above { 0\ \ 1
$$fe
$$ }
Fast select not requested
1\ \ 0
Fast select requested with no restriction of response
.br
1\ \ 1
Fast select requested with restrictions of response
 }
.T&
lw(132p) .
 {
\fIExpedited data (octet 3)\fR
.LP
Bit
.br
3
.LP
0
No request/request denied
.br
1
Request indicated/request accepted
 }
.T&
lw(132p) .
 {
\fIDelivery confirmation (octet 3)\fR
.LP
Bit
.br
2
.LP
0
Link\(hyby\(hylink confirmation
.br
1
End\(hyto\(hyend confirmation
 }
.T&
lw(132p) .
 {
\fIModulus (octet 3)\fR
.LP
Bit
.br
1
.LP
0
modulus 8 sequencing
.br
1
modulus 128 sequencing
 }
_
.TE
.nr PS 9
.RT
.ad r
ne
\fBTableau 4\(hy38/Q.931 [T160.931], p. 54\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 17P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.4
	\fIPacket layer window size\fR 
.sp 9p
.RT
.PP
The purpose of the Packet layer window size information element is to indicate 
requested layer\ 3 window size value to be used for the call. 
The values are binary\(hyencoded.
.PP
The Packet layer window size is coded as
shown in Figure\ 4\(hy48/Q.931.
.PP
The maximum length of this information element is 4 octets.
.RT
.LP
.rs
.sp 19P
.ad r
\fBFigure 4\(hy48/Q.931 [T161.931] \ \ 
(\*`a traiter comme tableau), p. 55\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 23P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.5
	\fIPacket size\fR 
.sp 9p
.RT
.PP
The purpose of the Packet size information element is
to indicate the requested packet size values to be used for the call.
The values are encoded log\d2\u.
.PP
The Packet size information element is coded as
shown in Figure\ 4\(hy49/Q.931.
.PP
The maximum length of this information element is 4 octets.
.RT
.LP
.rs
.sp 21P
.ad r
\fBFigure 4\(hy49/Q.931 [T162.931] \ \ 
(\*`a traiter comme tableau), p. 56\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 20P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.6
	\fIRedirecting number\fR 
.sp 9p
.RT
.PP
The purpose of the Redirecting number information element is
to identify the number from which a call diversion or transfer was invoked.
.PP
The Redirecting number information element is coded as
shown in Figure\ 4\(hy50/Q.931 and Table\ 4\(hy39/Q.931.
.PP
The maximum length of this information element is network
dependent.
.RT
.LP
.rs
.sp 24P
.ad r
\fBFigure 4\(hy50/Q.931 [T163.931] \ \ 
(\*`a traiter comme tableau), p. 57\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 16P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T164.931]\fR 
.ce
TABLE\ 4\(hy39/Q.931\ (Sheet\ 1\ of\ 2)
.ce
\fBRedirecting number information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIType of number (octet 3) (Note 1)\fR
.LP
Bits
.br
7\ \ 6\ \ 5
.LP
0\ \ 0\ \ 0
unknown (Note 2)
.br
0\ \ 0\ \ 1
international number (Note 3)
.br
0\ \ 1\ \ 0
national number (Note 3)
.br
0\ \ 1\ \ 1
network specific number (Note 4)
.br
1\ \ 0\ \ 0
subscriber number (Note 3)
.br
1\ \ 1\ \ 0
abbreviated number
.br
1\ \ 1\ \ 1
reserved for extension
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote 1\fR
\ \(em\ For the definition of international, national and
subscriber number, see Recommendation\ I.330 [18].
.LP
\fINote 2\fR
\ \(em\ The type of number \*Qunknown\*U is used when the user or the
network has no knowledge of the type of number, e.g., international number,
national number,\ etc. In this case the number digits field is organized
according to the network dialling plan; e.g., prefix or escape digits might be present.
.LP
\fINote 3\fR
\ \(em\ Prefix or escape digits shall not be included.
.LP
\fINote 4\fR
\ \(em\ The type of number \*Qnetwork specific number\*U is used to
indicate administration/service number specific to the serving network, e.g., used to acces an operator.
 }
.T&
lw(228p) .
 {
\fINumbering plan identification (octet 3)\fR
 }
.T&
lw(228p) .
 {
\fINumbering plan (applies for type of number = 000, 001, 010 and 100)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 0
unknown (Note)
.br
0\ \ 0\ \ 0\ \ 1
ISDN/telephony numbering plan (Recommendation E.164
[19]/E.163 [20])
.br
0\ \ 0\ \ 1\ \ 1
data numbering plan (Recommendation X.121) [21]
.br
0\ \ 1\ \ 0\ \ 0
telex numbering plan (Recommendation F.69) [22]
.br
1\ \ 0\ \ 0\ \ 0
national standard numbering plan
.br
1\ \ 0\ \ 0\ \ 1
private numbering plan
.br
1\ \ 1\ \ 1\ \ 1
reserved for extansion
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ The numbering plan \*Qunknown\*U is used when the user
or the network has no knowledge of the numbering plan. In this case the
number digits field is organized according to the network dialling
plan; e.g., prefix or escape digits might be present.
 }
.T&
lw(228p) .
 {
\fIPresentation indicator (octet 3a)\fR
.LP
Bits
.br
7\ \ 6
.LP
0\ \ 0
Presentation allowed
.br
0\ \ 1
Presentation restricted
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ At the redirecting user\(hynetwork interface, the
presentation indicator is used for indicating the intention of the
redirecting user for the presentation of the redirecting number to the
called used. This may also be requested on a subscription basis. If octet
3a is omitted, and the network does not support subscription information for
the redirecting number information restrictions, the value
\*Q00 \(em presentation allowed\*U is assumed.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy39/Q.931 (1 de 2) [T164.931], p. 58\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T165.931]\fR 
.ce
TABLE\ 4\(hy39/Q.931\ (Sheet\ 2\ of\ 2)\fR 
.ce
\fBRedirecting number information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fIScreening indicator (octet 3a)\fR
.LP
Bits
.br
2\ \ 1
.LP
0\ \ 0
User\(hyprovided, not screened
.br
0\ \ 1
User\(hyprovided, verified and passed
.br
1\ \ 0
User\(hyprovided, verified and failed
.br
1\ \ 1
Network provided
 }
.T&
lw(228p) .
 {
\fINote\fR
\ \(em\ If octet 3a is omitted, \*Q00 \(em user\(hyprovided, not
screened\*U is assumed.
 }
.T&
lw(228p) .
 {
\fIReason for redirection (octet 3b)\fR
.LP
Bits
.br
4\ \ 3\ \ 2\ \ 1
.LP
0\ \ 0\ \ 0\ \ 1
Call forwarding busy or called DTE busy
.br
0\ \ 0\ \ 1\ \ 0
Call forwarding no reply
.br
1\ \ 0\ \ 0\ \ 1
Called DTE out of order
.br
1\ \ 1\ \ 1\ \ 1
Call forwarding unconditional or systematic call
redirection
.br
1\ \ 0\ \ 1\ \ 0
Call forwarding by the called DTE
.LP
All other values are reserved.
 }
.T&
lw(228p) .
 {
\fINumber digits (octets 4, etc.)\fR
.LP
This field is coded with IA5 characters, according to the formats
specified in the appropriate numbering/dialling plan.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy39/Q.931 (2 de 2) [T165.931], p. 59\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 22P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
4.7.7
	\fITransit delay selection and indication\fR 
.sp 9p
.RT
.PP
The purpose of the Transit delay selection and indication
information element is to request and indicate the nominal maximum permissible 
transit delay applicable on a per call basis to that virtual call. 
.PP
The Transit delay selection and indication information element is
coded as shown in Figure\ 4\(hy51/Q.931 and Table\ 4\(hy40/Q.931.
.PP
The maximum length of this information element is 5 octets.
.RT
.LP
.rs
.sp 21P
.ad r
\fBFigure 4\(hy51/Q.931 [T166.931] \ \ 
(\*`a traiter comme tableau), p. 60\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 3
.ce
\fBH.T. [T167.931]\fR 
.ce
TABLE\ 4\(hy40/Q.931
.ce
\fBTransit delay selection and indication information element\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(228p) .
 {
\fITransit delay selection and indication value [octet 3 (bits 1\(hy2), octets\fR
\fI3a and 3b]\fR
.LP
Transit delay value binary encoded in milles
econds. Bit 2 of octet 3 is the highest order bit and bit 1 of octet\ 3b is the lowest order bit. The transit delay value occupies 16\ bits total.
.LP
\fINote\fR
\ \(em\ For a Recommendation X.31[14] type of acce
ss to an ISDN the
procedures only apply in the notification phase at the terminating exchange. At the terminating exchange, if the Transit Delay Selection and Indication
facility is present in the X.25 [5] incoming call request packet, the two octet value should be copied into octets\ 3, 3a and\ 3b with the highest order bit
contained in bit\ 2 of octet\ 3 and the lowest order bit contained in bit\ 1 of
octet\ 3b.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 4\(hy40/Q.931 [T167.931], p. 61\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp