Question 10/XVIII - Impact of signal processing on ISDN

Considering

(a) the existing Recommendations on coding;

(b) that the present ISDN is based on 64 kbit/s capabilities;

(c) that Study Group XV is studying further coding and signal processing
techniques;

(d) that there is a need for encryption for some services;

the following should be studied:

1. What is the impact of new and existing types of signal processing,
encoding and encryption methods on the network capabilities of ISDNs
(e.g., switching and signalling, selection/rejection, etc.) for example:

1.1 7 kHz audio encoding within 64 kbit/s, 32 kbit/s ADPCM encoding, and
lower rate encoding;

1.2 speech packetization;

1.3 encoding for audiovisual services (e.g., visual telephony,
videoconferencing, audiographic and Telematic teleconferencing etc.)?

Note 1 - To be studied in cooperation with Study Group XV.

Note 2 - With reference to Recommendation G.722 (7 kHz audio encoding
within 64 kbit/s), the study should specify how the ISDN can utilize
such method of coding for intra-ISDN applications, with due
consideration for interworking with the PSTN and Recommendation G.711
encoding.