Appendix B. ISUP Messages (ANSI/UK/ETSI/ITU-T)
The table in this appendix summarizes ISDN User Part (ISUP) messages and the purpose of each. For an introduction to ISUP, refer to Chapter 8, “ISDN User Part (ISUP).”
Table B-1. ISUP Messages
Message/Code | Full Message Name | Purpose |
|---|---|---|
ACM 0 0 0 0 0 1 1 0 | Address Complete | Sent in the backward direction, indicating that all address signals have been received and that the call set-up is progressing. |
ANM 0 0 0 0 1 0 0 1 | Answer | Sent in the backward direction to indicate that the called party has answered the call. May be used to trigger billing and measurements of call duration. |
APM (NI99)(I) 0 1 0 0 0 0 0 1 | Application Transport | Sent in either direction to convey application information using the Application Transport ... |
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