[Users] sdp negotiation fails - no ACK - rtpproxy

Benko benkokakao at gmail.com
Fri Mar 9 11:19:24 CET 2007


Hi!

Thanks for your answer, you've pointed the finger on it, i've found the
error yesterday and it was the rr-module. Looks like i was far too
focused on nat/sdp ;-)

Regards
Christian


On Thu, 08 Mar 2007 21:57:16 +0200
Daniel-Constantin Mierla <daniel at voice-system.ro> wrote:

> Hello,
> 
> didn't looked at traces, but in the past MS SIP stuff had issues with 
> record routing. Make sure you turn on enable_full_rr parameter of rr
> module.
> 
> http://www.openser.org/docs/modules/1.2.x/rr.html#AEN89
> 
> Another issue might be related to codecs, might be that exchange does 
> not like asterisk codec, put is less probable.
> 
> Cheers,
> Daniel
> 
> On 03/06/07 15:29, Benko wrote:
> > Hello!
> >
> > I'm struggling with a issue since several days, since i make no more
> > efforts i'd like to ask you for help: 
> > I'm trying to attach a exchange 2007 server to openser, most of the
> > features work(inbound call, refer) but i can't get a outbound call
> > to work as exc doesn't seem to like the SDP in my "200 OK" answer,
> > i get no ACK and no rtp-stream is sent from exchange. My setup
> > looks like this:
> >
> >     ________         _______        _____         ________
> >    |asterisk|=======|openser|======|(NAT)|=======|exchange|
> >    |________|       |_______|      |_____|       |________| 
> >    2x.x.x.107       2x.x.x.106    62.x.x.193      10.1.99.97
> >
> >
> > A rtpproxy is running on the openser too, exchange is talking tcp...
> >
> >
> > In my openser-config i use the nathelper-module and rtpproxy to
> > traverse nat for the clients. This setup is working for all phones
> > i've tested so far, so imho it is useable.
> >
> > Exchange has a feature that allows dialouts to read voicemail to
> > e.g. a mobile phone. It is using a standard INVITE dialog, in a
> > local network without nat i've been succesfull to attach exchange
> > to sipx and a phone registered at sipx and i guess it will also
> > work with a local openser who doesn't use nat-traversal features.
> >
> > However, with the public openser where i have a NAT, exchange
> > doesn't seem to accept my sdp-proposal, i get no ACK and the rtp
> > stream is only sent by asterisk, not by exchange. 
> > Unfortunately exchange offers no valuable debugging information, so
> > i have no idea what exactly it doesn't like about my answer - i did
> > some trial and error with different nat-helper-functions, activated
> > and deactivated them but so far it didn't make a difference(or the
> > call didn't got through at all due to missing nat-traversal).
> >
> > I've uploaded wireshark-traces exported to text of the
> > working local dialog with sipX(http://pastebin.ca/383516) and the
> > non-working external dialog (http://pastebin.ca/383540) with
> > openser, maybe someone can take a look at it and check if
> > there's something wrong on my(=openser) side of the dialog - Thanks
> > in advance!
> >
> > best regards
> > Christian
> >
> > _______________________________________________
> > Users mailing list
> > Users at openser.org
> > http://openser.org/cgi-bin/mailman/listinfo/users
> >
> >   




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