[SR-Users] kamailio / rtpproxy - remove codec

[Daniel-Constantin Mierla]

Hello,

you are using it with some rtp relay function. Remove the codec, then do 
msg_apply_changes() (all this before doing record route), then do the 
rtp relaying.

Cheers,
Daniel

On 07/04/14 12:01, Oliver Roth wrote:
>
> Here we go
>
> IN
>
> INVITE sip:41442742931 at 81.7.235.180:5060;transport=udp SIP/2.0
>
> Via: SIP/2.0/UDP 82.197.185.185;branch=z9hG4bKa368.02f63ac6.0
>
> Via: SIP/2.0/UDP 
> 195.216.67.103:5060;branch=z9hG4bK008082590C36C1313E749FCBA4C6
>
> Route: <sip:82.197.185.186;lr=on>
>
> From: 
> <sip:+41446512001 at 195.216.67.103;user=phone>;tag=008082590C36C1313BF6EF12E7F2
>
> To: <sip:+41442742931 at 82.197.185.185;user=phone>;tag=snl_0014532334
>
> Call-ID: e43880005082-533eb654-10953444-55d4a80-6bc5dd at 127.0.0.1
>
> CSeq: 5466 INVITE
>
> Contact: <sip:+41446512001 at 195.216.67.103:5060>
>
> Max-Forwards: 69
>
> Content-Type: application/sdp
>
> Session-Expires: 1800;refresher=uas
>
> Supported: 100rel, timer, replaces
>
> Content-Length: 330
>
> v=0
>
> o=- 82545395 2 IN IP4 195.216.67.103
>
> s=session
>
> t=0 0
>
> m=audio 4550 RTP/AVP 8 0
>
> c=IN IP4 195.216.67.120
>
> a=rtpmap:8 PCMA/8000
>
> a=rtpmap:0 PCMU/8000
>
> a=sendrecv
>
> m=image 4552 udptl t38
>
> c=IN IP4 195.216.67.120
>
> a=T38FaxVersion:0
>
> a=T38MaxBitRate:14400
>
> a=T38FaxUdpEC:t38UDPRedundancy
>
> a=T38FaxRateManagement:transferredTCF
>
> OUT
>
> INVITE sip:41442742931 at 81.7.235.180:5060;transport=udp SIP/2.0
>
> Via: SIP/2.0/UDP 82.197.185.186;branch=z9hG4bKa368.aca64b5.0
>
> Via: SIP/2.0/UDP 82.197.185.185;branch=z9hG4bKa368.02f63ac6.0
>
> Via: SIP/2.0/UDP 
> 195.216.67.103:5060;branch=z9hG4bK008082590C36C1313E749FCBA4C6
>
> From: 
> <sip:+41446512001 at 195.216.67.103;user=phone>;tag=008082590C36C1313BF6EF12E7F2
>
> To: <sip:+41442742931 at 82.197.185.185;user=phone>;tag=snl_0014532334
>
> Call-ID: e43880005082-533eb654-10953444-55d4a80-6bc5dd at 127.0.0.1
>
> CSeq: 5466 INVITE
>
> Contact: <sip:+41446512001 at 195.216.67.103:5060>
>
> Max-Forwards: 68
>
> Content-Type: application/sdp
>
> Session-Expires: 1800;refresher=uas
>
> Supported: 100rel, timer, replaces
>
> Content-Length: 188
>
> v=0
>
> o=- 82545395 2 IN IP4 82.197.185.186
>
> s=session
>
> t=0 0
>
> m=audio 64748 RTP/AVP 8 0
>
> c=IN IP4 82.197.185.186
>
> a=rtpmap:8 PCMA/8000
>
> a=rtpmap:0 PCMU/8000
>
> a=sendrecv
>
> 5037682.197.185.186
>
> *Von:*sr-users-bounces at lists.sip-router.org 
> [mailto:sr-users-bounces at lists.sip-router.org] *Im Auftrag von 
> *Daniel-Constantin Mierla
> *Gesendet:* Montag, 7. April 2014 10:40
> *An:* Kamailio (SER) - Users Mailing List
> *Betreff:* Re: [SR-Users] kamailio / rtpproxy - remove codec
>
> Hello,
>
> can you give the incoming sdp and outgoing sdp (both as text) when you 
> are using sdp_remove_media, to see what gets malformed there?
>
> Cheers,
> Daniel
>
> On 07/04/14 08:37, Oliver Roth wrote:
>
>     Hi all
>
>     We use kamailio 3.3.7 and rtpproxy for enduser call-termination.
>
>     In case of a fax call, we get an invite from our carrier for
>     codecs G711a/u and T38.
>
>     As our termination carrier does not support T38 and because the
>     invite contains G711 and T38 we get back error 488.
>
>     How is it possible to remove the whole T38 part of this invite?
>
>     We tried
>     sdp_remove_codecs_by_name(list) without success – what “name”
>     should we use for T38? [T38, t38, t.38, T.38, …]
>     sdp_remove_line_by_prefix(string)
>     sdp_remove_media(type)
>
>     None of these functions did really work – best was the last one
>     with type=image but then the sip header is malformed.
>
>     As we saw with Kamailio version 4.1.x there are a lot of new
>     functions within sdpops. Would an upgrade help?
>
>     So basically the question is:
>
>     How to remove the t38 part of the fax invite? (see attachment)
>
>     KR,
>
>     Oli
>
>
>
>
>
>     _______________________________________________
>
>     SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>
>     sr-users at lists.sip-router.org  <mailto:sr-users at lists.sip-router.org>
>
>     http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
>
> -- 
> Daniel-Constantin Mierla -http://www.asipto.com
> http://twitter.com/#!/miconda  <http://twitter.com/#%21/miconda>  -http://www.linkedin.com/in/miconda
> Kamailio World Conference - April 2-4, 2014, Berlin, Germany
> http://www.kamailioworld.com

-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference - April 2-4, 2014, Berlin, Germany
http://www.kamailioworld.com

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