ITU-T Q.601-Q.695 ANNEX B-1993 Interworking of Signalling Systems - Narrative Presentation of Interworking - Interworking of Signalling Systems Study Group XI; 26 pp
After the sending of the ACM and until the release of the call, on receipt of the Forward transfer message (FOT), the Forward transfer signal is sent (F2).
ITU-T Q.601-Q.695 ANNEX B-1993 history
1993ITU-T Q.601-Q.695 ANNEX B-1993 Interworking of Signalling Systems - Narrative Presentation of Interworking - Interworking of Signalling Systems Study Group XI; 26 pp