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Issues ad-hoc conferencing Cisco and Avaya phones together

I have a Definity G3 system and a CUCM 10.x system.  They are connect through 3 standard ISDN (not QSIG) T1 ties to a Cicso H323 voice gateway.  I am using the software media resources on CUCM for Cisco-side conferencing.  Regular calls work correctly, but here is my issue. 

When I have a call going between a Cisco phone and an Avaya phone and I try to conference in another Cisco phone, the Avaya call gets dropped as soon as I hit the CONF button a second time to bridge the calls together.  This happens regardless of whether I start with 1 Cisco and 1 Avaya and try and pull in a 2nd Cisco or whether I have 2 Ciscos and try to pull in an Avaya. 

I can conference multiple Cisco phones without any trouble. 

To make things stranger, if I have the same call going with 1 Cisco and 1 Avaya and I hit CONF on the Avaya phone, I can pull in a second Cisco phone successfully.  Not only that, but when I hang up the Avaya phone that bridged the call, the two Cisco phones stay connected to each other (I'm assuming this is a setting on the Avaya system).

On the Avaya side, when the Avaya phone gets dropped, you see a Denial Event 1197 error.  On the Cisco side I see a Disconnect Cause 47. 

 

Anyone have any thought on what might be causing this? 

2 REPLIES

Cause code 47 means resource

Cause code 47 means resource unavailable. I would make sure that the Cisco phone that is going to do the conference has a conference bridge resource available to it. 

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New Member

I found the issue.  It turns

I found the issue.  It turns out that I had forgotten to put a voice class codec on my voip dial-peers back to CUCM, so my phone > gateway call legs were using G729a.  As soon as I changed the dial-peers to G711 conferencing started working. 

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