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Outbound voice call from VTA failing through H323 IOS gateway when using VT advantage with CallManager. The PSTN releases the call with the Cause code = Incompatible destination when using VT advantage with CallManager error message

TCC_2
Level 10
Level 10

‎06-22-2009 04:10 PM - edited ‎03-12-2019 08:39 AM

Core Issue

The calling party is video enabled (IP phone with Cisco VT Advantage [CVTA]). The calling party and gateway are in different regions, between which the Video Call Bandwidth is set to None.

Resolution

For a workaround, issue the bearer-cap speech command on the voice port.

Note: This command forces the calls to use audio only, which allows the calls to work. This bypasses the bearer capabilities mismatch.

For more information, refer to: Understanding debug isdn q931 Disconnect Cause Codes.

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