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?
