thnks for your response, we made another test and saved the debug herewith attached. We were able to get ring back, but as soon as answered the call is dropped. The originating end goes through a firewall, they have opened ports 1720 and UDP on ports 16384 through 16384 + 4x (based on the fxs ports on the voice card). On some of the previous debug the h245 failed with timeout. I wld appreciate some advice. Thnks
Voice calls traversing a PIX Firewall get disconnected
Core Issue The PIX h225 fixup routine is causing the Transmission Control Protocol (TCP) zero byte keepalives between the voice gateway and the Cisco CallManager to fail. Consequently, the voice call gets terminated exactly five minutes after the call setup due to unacknowleged TCP keepalive packets.
Resolution Upgrade to a PIX Firewall version that contains a fix for the problem in Cisco bug ID CSCdy13293.
Another workaround is to downgrade to PIX version 6.1.3 or earlier. You may also disable fixup protocol h323 and h225 if Network Address Translation (NAT) is not used.
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