ITU-T Q.1103-1989 Interworking Between Signalling System No.5 and Inmarsat Standard A System - Interworking with Satellite Mobile Systems (Study Group XI) 8 pp
It is necessary to specify the interworking of Signalling System No. 5 and the signalling it may be desirable that a Maritime Satellite Switching Centre (MSSC)l) be connected to an international switching centre (ISC) by employing System No. 5 on circuits
ITU-T Q.1103-1989 history
1989ITU-T Q.1103-1989 Interworking Between Signalling System No.5 and Inmarsat Standard A System - Interworking with Satellite Mobile Systems (Study Group XI) 8 pp