i am trying to configure the 2811 router to listen for SIP messages on non-standard sip port 5070 with "ip port-map sip port 5070" command. The port mapping is visible in "show ip port-map" and packets are recieved on 5070 port. The problem is, that the packets are not recognized as SIP, and "debug ccsip messages" shows nothing. Has anyone succeeded in configuring such a thing?
I'm pretty far from a firewall expert, but if you were to correctly configure a SIP-aware firewall (including contact fields AND UDP ports), then CME would never know the difference.
My guess - I don't know if you can use IOS firewall and this type of configuration on the same router. If you were to detach it and use an ASA I'm sure this would work, but we run into some architectural headaches when this is attempted (especially for only some messages/ports).
This was our plan, until we saw the firewall. The firewall is where the story gets really fun. It's not possible to get an ASA in there, there is only a third party firewall, which is supposed to be SIP aware, however it seems it is far from that.
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