[SR-Users] nathelper-module and sdp offer in 200 OK

Ovidiu Sas osas at voipembedded.com
Wed Feb 9 18:51:29 CET 2011


The code seems to be correct.  The to and from tags are switched for:
 - reply with offer (200ok with first SDP)
 - request with answer (ACK with second SDP)

Are you sure that you are properly invoking offer/answer rtpproxy functions?


Regards,
Ovidiu Sas

On Wed, Feb 9, 2011 at 11:48 AM, Emil Kroymann <emil.kroymann at isaco.de> wrote:
> Hi,
>
> We recently had a problem with the nathelper module and rtpproxy in a
> scenario where the SDP offer is sent only in the 200 OK. We use
> sip-router 3.1 and rtp-proxy from git master. The sip-router
> configuration uses the rtpproxy_offer() and rtpproxy_answer() functions
> in appropriate places. The problem is, that the arguments sent to
> the rtpproxy, when the ACK with the sdp answer arrives, seems to be not
> in the order, that rtpproxy expects.
>
> On the 200 OK, the nathelper module sends callid, to-tag, from-tag to
> rtpproxy. On the ACK, the nathelper module sends callid, from-tag,
> to-tag (with different command prefixes, of course, but I cannot
> remember them atm). The version of rtpproxy that we are using seems to
> expect, that the order of arguments sent on the ACK request is the same
> as on the 200 OK.
>
> My question: are there any module parameters, to correct this behaviour?
>
> Regards,
>
> Emil
> --
> Emil Kroymann
> VoIP Services Engineer
>
> Email: emil.kroymann at isaco.de
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