Question 4/II - International interconnection of the different
mobile services and the public switched
telephone network or ISDN
(Continuation and expansion of Question 16/II,
1985-1988)

Considering

1. the existence of a world-wide maritime mobile satellite system
(INMARSAT);

2. the existence of and plans for automatic maritime mobile VHF/UHF
telephone services and land mobile telephone services;

3. the requirements specified in Resolution No. 201 of the WARC-79 and
Resolution No. 320 of MOB WARC-83 and Appendix 43 of MOB-83 and
the possible existence of plans for aeronautical services;

4. the Recommendations relating to numerical ship station identification
and numbering systems and selection procedures for international
telephone and ISDN service (E.210, E.211, E.215 and E.216);

5. the Recommendations relating to the identification plan for land
mobile stations and telephone numbering plan for land mobile stations
in public land mobile networks (E.212, E.213);

6. the Recommendation relating to numbering in the aeronautical
satellite system of INMARSAT (E.215);

7. the development of complementary Recommendations by other
CCITT Study Groups and the work of the cognizant Study Groups and
Interim Working Parties in the CCIR;

8. the basic requirements for common procedures at mobile units
having different communications capabilities e.g. telephony/telex,
satellite/VHF/UHF;

9. the planned introduction of land mobile satellite systems;

10. the planned implementation of mobile service location and
registration centres by some administrations;

11. the need to study the numbering and selection procedures for
VHF/UHF maritime mobile radio telex service in view of the deletion of
Recommendation F.121;

12. the rapid development of Integrated Services Digital Network
Recommendations,

What new Recommendations are required and what additions or
modifications to existing Recommendations are needed to provide for
international interconnection of the different mobile telephone or ISDN
services and the public switched telephone network and the ISDN?

The following items should, in particular, be included in the studies:

i) numbering and selection procedures for VHF/UHF maritime mobile
radio telex service;

ii) numbering and selection procedures for interconnection between
mobile systems, in particular INMARSAT, and terrestrial networks;

iii) numbering and selection procedures for group coast station calls;

iv) network quality of service.