I have two different infraestructures in my telephony network.
One Cisco, with one publisher, a suscriber and two voice gateways, one of them connected with a Nortel CS-1000 PBX by a QSIG.
When I try to do a conference between a Cisco and a Nortel, the Nortel phone leaves the conference itself.
Between Cisco phones, there is no problem.
Can anybody help me?.
Thanks in advance
How do you integrated Cisco with Nortel ? Which protocol ?
Does the Trunk/GW between Cisco and Nortel contains CFB in its MRGL ? Which all codec are in use when you do conference ?
If there is mismatch in codec then you need Xcoder for this.
'one of them connected with a Nortel CS-1000 PBX by a QSIG..'using E1/T1? If yes, try to use 'debug isdn q931' to see, who sends release message. If it goes from CUCM, then go through steps that Manish has suggested.