I'm setting up a new SIP trunk with nexVortex.com. I can make and receive calls with them. However, I only ever have one way audio. Snom sends the audio out but I never receive any back. I called nexVortex and they think that the audio they are sending is going to my SnomOne's private ip address, 192.168.0.7. How do I change the SIP Packet to tell nexVortex to send audio back to our public IP address so the firewall can route it to SnomOne. Right now I don't have any of my public IP's being forwarded to SnomOne. With my previous SIP provider, this wasn't necessary.
Here is part of the SIP trace they send me from their end.
2013/10/02 18:38:55.958292 173.167.75.17:5060 -> 66.23.129.253:5060 SIP/2.0 200 Ok..Via: SIP/2.0/UDP 66.23.129.253:5060;branch=z9hG4bK7fe3.1c76 34.0..Via: SIP/2.0/UDP 208.94.159.10:5060;branch=z9hG4bK-fa339-524c6830-71d e681f-2ba94f90..Record-Route: <sip:17172834883@66.23.129.253:5060;nat=yes;f tag=c00080a-13c4-524c6830-71de681f-15d3a53;lr=on>..From: "WIRELESS CALLER" <sip:15514043819@208.94.159.10:5060;isup-oli=61>;tag=c00080a-13c4-524c6830- 71de681f-15d3a53..To: <sip:17172834883@66.23.129.253:5060>;tag=04a10ec64c.. Call-ID: CXC-87-7a3d5780-c00080a-13c4-524c6830-71de681f-662e588d@208.94.159 .10..CSeq: 1 INVITE..Contact: <sip:Ai11163mLaK@192.168.0.7:5060;transport=u dp>..Supported: 100rel, replaces, norefersub..Allow-Events: refer..Allow: I NVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE..Accept: application/sd p..User-Agent: snomONE/4.5.0.1090 Epsilon Geminids..Content-Type: applicati on/sdp..Content-Length: 274....v=0..o=- 20464 20464 IN IP4 192.168.0.7..s=- ..c=IN IP4 192.168.0.7..t=0 0..m=audio 60872 RTP/AVP 0 18 101..a=rtpmap:0 p cmu/8000..a=rtpmap:18 g729/8000..a=fmtp:18 annexb=no..a=rtpmap:101 telephon e-event/8000..a=fmtp:101 0-16..a=rtcp-xr:rcvr-rtt=all voip-metrics..a=sendr ecv..