[Freeswitch-users] No audio after Remote SDP:

Brian West brian at freeswitch.org
Sun Dec 20 14:36:14 PST 2009

On Dec 20, 2009, at 2:53 PM, Gad Bentolila wrote:

> DISCLAIMER: I'm REALLY new to FreeSwitch, so please take my advice with a grain of salt.

Welcome to the community.

> I have a similar setup (and problem) - the wiki documentation refers to it as "double nat". Like you, my FS and client are behind different NATs and I can register my remote endpoint and make calls (in my case, to the the FS demo ivr at 5000).
> Since your external endpoint (spa3102) is registering, you've likely setup your sip profile correctly (ext-sip-ip, ext-rtp-ip, nat settings, etc).

Your endpoint need only insert rport and FreeSWITCH will do the right thing.  

> 1) Setup stun on your remote endpoint (spa3102 in your case)
> 2) Add <variable name="sip-force-contact" value="NDLB-connectile-dysfunction"/> to the directory xml file that describes your spa3102 endpoint

The device supports STUN also its highly recommended your device know how to overcome its own NAT.  I personally do not believe its the registrars place to overcome an endpoints nat... puts undue burden on the registar.

> Option 1 worked for me right away (eyebeam in my case) and, as expected, the remote sdp had the correct (remote) IP address, since the endpoint is using stun to correctly identify its IP address to FS. However, option 2 has not made a difference (for me). Is it just me or is it strange that SIP works without stun, but RTP doesn't?
> I guess I've been spoiled by the way Asterisk handles NAT and was hopeful that NDLB-connectile-dysfunction would behave similarly, so I wouldn't have to tell users to setup stun on their clients. Maybe a FS user with some experience with this type of NAT setup and these settings can help. I'd be interested in knowing how to correctly setup remote NATted endpoints without stun - or, at least, hear from someone that this setting works for them without stun.
> Anyway, hope this helps you with your SPA3102.

Bottom line is enable rport and use stun on the SPA and it'll just work.


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