[cisco-voip] problem for Cisco 7912 ip phone behind pix firewall

[Voll, Scott]

sounds like maybe a fixup protocol on the pix?

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of sekchye goh
Sent: Thu 12/23/2004 8:22 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] problem for Cisco 7912 ip phone behind pix firewall



Hi there!

   We have two cisco 7912 ip phone using SIP firmware behind PIX
firewall.  These two phone is configured to register to a SIP proxy on
the public Internet.  This SIP proxy is using SER
(http://www.iptel.org/ser/).  These two Cisco 7912 ip phones are PAT
to a single IP.

   The problem we have is when these two phones call each other, the
two party cannot hear each other 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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