4-8 Message structure and function
297-2521-106 Standard 23.01 March 2001
Q.931 message descriptions
Table NO TAG1 lists Q.931 messages in alphabetical order. Included are
each message’s meaning, direction, event information, and (where
applicable) the correlation of messages with traditional telephone events.
The following list depicts the messages in the order of their appearance
during regular call setup.
• SETUP
• CALL PROC
• PROG
• ALERT
• CONN
• CONN ACK
• DISC
• REL
• REL COM
• NOTIFY
• REST
• REST ACK
• STATUS ENQ
• STATUS
• SERV
• SERV ACK
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