Question 10/VII - General technical principles for interworking between
public networks or between public networks and other networks for the
provision of data services (continuation of part of Question 10/VII
studied in 1985-1988)

considering

(a) that the provision of data services may require several networks to
interwork;

(b) the framework of X-Series Recommendations related to interworking
given in Recommendation X.300;

(c) that the CCITT studies several types of networks for the provision
of data services;

(d) that consequently many interworking scenarios have been and
continuously will be identified for the purpose of interworking;

(e) that general principles are needed to study these scenarios and that
Recommendation X.300 already defines such principles;

(f) that Recommendation X.305 specifies how different networks relate to
the provision of the OSI NS end-to-end;

What further additions to existing Recommendations X.300 and X.305, or
new Recommendations, if any, are required to define general principles
for interworking for the provision of data services?

This study should include:

-possible enhancements or new descriptions of existing or new
interworking scenarios and the abstract/functional requirements
resulting from these scenarios;

-general principles on service indications and compatibility checking,
based on the work done during the 1985-1988 study period (see Annex 1);

-resulting from above points, general guidelines for detailed
descriptions of interworking cases;

-further alignment of the representation of network elements in
Recommendation X.300 and for example X.31 and X.122 (e.g. PH/AU/IWF).
Question 11/VII - Arrangements generic to different interworking
(circuit and packet modes) between public networks or between public
networks and other networks, for the provision of data services
(continuation of part of Question 10/VII studied in 1985-1988)

Considering

(a) that the provision of data services may require several networks to
interwork;

(b) the framework of X-Series Recommendations related to interworking
given in Recommendation X.300;

(c) that X.300 defines general principles for interworking for the
provision of data services and provides for a structure for interworking
scenarios;

(d) that X.301 defines general principles for call control within and
between subnetworks, independent of the protocol-type that is used;

(e) that there is a continuous need to identify further details or
aspects for such call control that new types of subnetworks are
emerging,

What further additions to existing Recommendations X.301, X.180 and
X.181, or new Recommendations are needed, if any, to define general
principles for call control between and within subnetworks for the
provision of data transmission services?

This study should include:

-new emerging aspects of call control (e.g. addressing, optional user
facilities,...);

-between the I.250-Series and X.301 alignment, where needed.