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In Cisco CallManager with the H.323 IOS gateway when PSTN users go on-hook to call an IP phone, they receive a recorded message rather than a disconnect

Core Issue

The debug Isdn q931 command output shows this message when the Public Switched Telephone Network (PSTN) user hangs up the call:

ISDN Se1/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x8012

Resolution

Issue the voice call disc-pi-off command on the H.323 gateway so the gateway treats a disconnect message with a Progress Indicator (PI), as it treats a standard disconnect without a PI, (issue the voice call disc-pi-off command in global configuration mode).

For more information on this command, refer voice call disc-pi-off in the Commands: vad (dial peer) through voice class dualtone-detect-params.


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