Hi there!
We have two cisco 7912 ip phone using SIP firmware behind PIX
firewall. These two phone is configured to register to a SER proxy on
the public Internet. These two Cisco 7912 ip phones are PATor NAPT
to a single IP.
The problem we have is when these two phones call each other, the
two party cannot hear each other's voice.
If we replace the PIX firewall with a Cisco router, there is no such problem.
Does anyone encounter this problem before? I am clueless on how to
resolve this problem. Any pointers will be much appreciated.
Thank you very much!
Best regards
sekchye
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