Summary

This Amendment 3 to the ISUP Specification Q.764 (12/1999) contains three modifications:

1)          Fallback procedures;

             modification of clause 2.5.2.2.2.

2)          Procedures to support the calling party's category for calls from mobile terminals;
new procedures in a new clause 2.26.

3)          Signalling procedures for automatic re-routing (crankback);
new procedures in a new clause 2.27.

NOTE – Previous amendments to ITU-T Rec. Q.764 (12/1999) still apply and need to be taken into account when applying this amendment.