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

[Carsten Bock]

Hi,

just a hint: If you use rtpoffer/answer for SDP in 200ojk/ACK, the
SDP-Offer is in the 200 OK, so you need to call "rtp_offer" for the
200 OK instead of the usual "rtp_answer" for the 200 OK. The ACK/SDP
contains then the rtp_answer.
Works like a charm for me....

Carsten

2011/2/10 Emil Kroymann <emil.kroymann at isaco.de>:
> When I checked the code of the nathelper module that we are using,
> it didn't seem to be the case, that to and from tags are switched
> for the ACK request. Maybe, something has been changed after the
> point we checked out sip-router. When was this code last changed?
>
> Am Wed, 9 Feb 2011 12:51:29 -0500
> schrieb Ovidiu Sas <osas at voipembedded.com>:
>
>> 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
>> > Tel: +49-30-203899885
>> >
>> > ISACO GmbH
>> > Kurfürstenstraße 79
>> > 10787 Berlin
>> > Germany
>> >
>> > Amtsgericht Charlottenburg, HRB 112464B
>> > Geschäftsführer: Daniel Frommherz
>> >
>> >
>> > _______________________________________________
>> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
>> > list sr-users at lists.sip-router.org
>> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>> >
>> >
>>
>
>
>
> --
> Emil Kroymann
> VoIP Services Engineer
>
> Email: emil.kroymann at isaco.de
> Tel: +49-30-203899885
> Mobile: +49-176-38389303
>
> ISACO GmbH
> Kurfürstenstraße 79
> 10787 Berlin
> Germany
>
> Amtsgericht Charlottenburg, HRB 112464B
> Geschäftsführer: Daniel Frommherz
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
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>
>



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