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H323 Disconnect while transfer external calls

Hello,

we got a problem with two H323 Voice Gateways. I will describe a scenario with the problem.

A internal caller with number 0XXXXXXXX554 calls a external destination in the PSTN with caller id 0XXXXXXXX10. The call was connected. The internal caller wants to transfer the external to another external destination 0176XXX7739.

We see in a debug isdn q931 that the call to the second destination was connected for 4 seconds. Than it was disconnected.

We have two Gateways with same IOS Software 12.4(15)T7 and Cisco Callmanager with Version 7.0.2.20000-5.

I hope someone has a idea to check.

As Attachment there is a isdn debug with q931 and h245.

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