I'm trying to configure a 2600 with fxs cards as a sip-ua to communicate with an ISP's sip network. I've run a couple of debugs and my sip packets are being sent out as my LAN ip range which I suspect could be the reason i'm not receiving any reply messages. I've tried creating a loopback on that router with the inside global ip address with no success. I'm wondering if there are any options? I've seen information on session border controllers which can modify the SIP headers for me but I'd need to upgrade routers. I've also seen that on ATA186/188 you can specify the WAN IP address but that means buying an ATA.
Can you confirm that SIP messages are sent the with the wrong source address, by applying an access list on the outside interface ? Either if you deny or permit traffic sourced from the wrong interface, you will have a counter about this.
Also, can you confirm messages that messages have the correct from address in the SIP message ?
Also I would suggest you upgrade at least to latest maintenance of 12.3T. That should fit even in the limited memory of the 2600.
If i apply an access list won't that just catch any traffic coming from that interface? It's coming from the right interface but because of the NAT the sip messages are displaying the incorrect WAN address.
If 192.168.0.3 is the interface going to the device doing NAT, that is correct. Now, your NAT device should have support for SIP, that is, it should change this address to his own WAN address. Cisco NAT devices, like IOS and the PIX, supports this.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
Over the last few months, I have had the privilege of working on SI...
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