Rec. ITU-T Q.764 (03/1993) … SIGNALLING SYSTEM No. 7 … ISDN USER PART SIGNALLING PROCEDURES
FOREWORD
CONTENTS
1 General
2 Basic call control and signalling procedures
    2.1 Successful call set-up
    2.2 Unsuccessful call set-up
    2.3 Normal call release
    2.4 Suspend, resume
    2.5 Signalling procedures for connection type allowing fallback
    2.6 Propagation delay determination procedure
    2.6.1 Procedure
    2.7 Echo control procedure
    2.8 Network features
    2.9 Abnormal conditions
    2.10 ISDN User Part signalling congestion control
    2.11 Automatic congestion control
    2.12 Unequipped circuit identification code message (national use)
    2.13 ISDN User Part availability control
    2.14 MTP Pause/Resume
    2.15 Overlength messages
Annex A
Annex B … Figures on basic call control signalling procedures
Annex C … Examples of echo control signalling procedures
C.1 Echo control equipment in all exchanges
C.2 Multiple forwardings
C.3 Echo control equipment is not available in all exchanges
C.4 Echo control equipment is not available in all exchanges
C.5 Interworking with signalling systems not supporting the echo control procedure in the preceding network
C.6 Interworking with signalling systems not supporting the echo control procedure in the succeeding network
C.7 Procedures after address complete … backward direction
C.8 Procedures after address complete … forward direction
Annex D … Examples of signalling procedures for connection type allowing fallback
Annex E … Test calls
E.1 Called number for test calls
E.2 Accounting of test calls
Annex F … Cause values
Annex G … Start up procedures
G.1 Initial procedure for putting the first group of circuits into service
G.2 Initial procedure for putting additional circuits into service
G.3 Test procedures