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On the H.323 IOS gateway, no busy tone is heard on the IP phone if the dialed PSTN number is engaged. The IP phone receives a reorder tone after a period of silence

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Core Issue

This problem is seen even when the correct source IP address is bound to the correct IP interface on the H.323 gateway, with the voice rtp send-recv command configured.

In this case, the debug isdn q931 command shows that the network is clearing the call correctly with the user-busy cause.

Resolution

In order to resolve this issue, add the voice call convert-discpi-to-prog command to the global configuration of the H.323 gateway. This command converts an inbound ISDN disconnect message with a PI to an H.225 progress message with the same PI value.

Refer to Troubleshooting No Busy Tone and No Announcement Messages on ISDN-VoIP (H.323) Calls for further details.

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