Howto:SIP/ISDN signaling interworking

Applies To

This information applies to

• all innovaphone products

V6 sr2 or higher.

More Information

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Call to a busy PSTN user with inband information provided by PSTN

1. -> SIP/INVITE
2. -> ISDN/SETUP
3. <- ISDN/DISCONNECT with cause 'user busy' and progress indicator
4. <- SIP/183 Session Progress

Calling user hears the inband information provided by PSTN and terminates the call then.

5. -> SIP/CANCEL
6. <- SIP/200 OK
7. -> ISDN/RELEASE
8. <- SIP/487 Request Terminated
9. -> SIP/ACK

Call to a busy PSTN user without inband information

1. -> SIP/INVITE
2. -> ISDN/SETUP
3. <- ISDN/RELEASE with cause 'user busy'
4. <- SIP/486 Busy Here
5. -> SIP/ACK

Treat ISDN/DISCONNECT like RELEASE

To enable the gateway to treat a disconnect message with progress indicator (PI) like a release message, use the config option "No Inband Disconnect".

1. -> SIP/INVITE
2. -> ISDN/SETUP
3. <- ISDN/CONNECT
4. <- SIP/200/OK
...
5. <- ISDN/DISCONNECT with progress indicator
6. <- SIP/BYE