[cisco-voip] SIP Trunking and Checkpoint Firewall

[STEVEN CASPER]

We have successfully installed and tested SIP trunking from Verizon and we are now trying to run the product behind a Checkpoint firewall. So far we have not having any luck despite installing patches from Checkpoint. 
 
 Inbound calls do not complete though I see signaling exchange. On an outbound call the call completes but there is no audio in either direction It appears that Verizon dynamically changes ports and address during call set up and the Checkpoint can not adapt. Has anyone been successful running IP trunking through a Checkpoint or any other firewall. Thinking we may give an ASA a try.
 
Steve
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