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One Way Audio

Dale Weaver

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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, 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 ->
SIP/2.0 200 Ok..Via: SIP/2.0/UDP;branch=z9hG4bK7fe3.1c76
34.0..Via: SIP/2.0/UDP;branch=z9hG4bK-fa339-524c6830-71d
e681f-2ba94f90..Record-Route: <sip:17172834883@;nat=yes;f
tag=c00080a-13c4-524c6830-71de681f-15d3a53;lr=on>..From: "WIRELESS CALLER"
71de681f-15d3a53..To: <sip:17172834883@>;tag=04a10ec64c..
Call-ID: CXC-87-7a3d5780-c00080a-13c4-524c6830-71de681f-662e588d@208.94.159
.10..CSeq: 1 INVITE..Contact: <sip:Ai11163mLaK@;transport=u
dp>..Supported: 100rel, replaces, norefersub..Allow-Events: refer..Allow: I
p..User-Agent: snomONE/ Epsilon Geminids..Content-Type: applicati
on/sdp..Content-Length: 274....v=0..o=- 20464 20464 IN IP4
..c=IN IP4 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

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Oh. Did not see the version in the text spaghetti above. It could be that the PBX has to suppress the call quality metric in the SDP to get it working; that was added in some 5.0.x version (many service providers actually have that problem). Maybe install a version 5 (free) on a test host and get the trunk working; then you can copy & paste the setting into the version 4 to see if that solves the problem.

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