[cisco-voip] 8831 Conference phone call drops

[Dave Wolgast]

My customer has 3 beautiful new 8831 SIP conference phones running SIP load
9-3-3-5. The customer is running CUCM 9.1(2)SU1.

When we make a call from the phone to either internal or PSTN destinations,
the remote phone rings. When answered, we get about 1 second of rtp to the
8831, then it drops with the message "Lost connection with server. Call in
progress will be preserved." The call stays up on the remote side with dead
air.

The customer has a checkpoint firewall between CUCM and the users, and sees
the firewall dropping packets from the phone classified as
sip_any-tcp-ipv6. This is confusing because we are not running IPv6
anyplace and have explicitly disallowed it in Common Phone Configuration.

Does anyone have any ideas/advice?


-- 
Dave Wolgast
Livonia, NY
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