ITU-T Q.1902.4 AMD 2

This amendment to the ISUP Specification ITU-T Rec. Q.1902.4 (07/2001) contains seven modifications: 1) Correction of a cut and paste error in 7.4.1 and 7.4.4; 2) Modifications of the codec negotiation in 8.3; 3) Fallback procedures modification of 8.6.2.2.2; 4) Signalling procedures for automatic rerouting (crankback); new procedures in a new clause 8.21; 5) Procedures to support the calling party's category for calls from mobile terminals; new procedures in a new clause 8.22; 6) Handling of national use elements at an international gateway SN or CMN; new procedures in a new clause 13.8; 7) Two message flows examples in codec negotiation and modification in Appendix I. NOTE - Previous Amendment(s) to Q.1902.4 (07/2001) still apply and need to be taken into account when applying this Amendment.