[SR-Users] Disabling video rtp proxing

Wed Aug 31 14:51:47 CEST 2022

That's what I'm using.
Thanks.

On Fri, Aug 26, 2022 at 3:54 PM Yuriy Gorlichenko <ovoshlook at gmail.com>
wrote:

> The easiest way I see is:
> Set up mod parameters for rtpengine
> Read_avp and write_avp
> During the request processing get $rb and put it into read_avp
>
> Change/remove needed lines from the sdp in avp using regexp or
> lua/js/python (do not use sdpos as it works with initial sdp, so it won't
> affect the data in avp )
>
> Call rtpengine_manage
> Use write_avp after in the call of set_body to apply updated value
>
>
> https://www.kamailio.org/docs/modules/devel/modules/textops.html#textops.f.set_body
>
> Then you get your changes.
>
> On Fri, 26 Aug 2022, 01:23 mayamatakeshi, <mayamatakeshi at gmail.com> wrote:
>
>> Hi,
>> Yes, I tried.
>> I had this code in my cfg file:
>>
>>     sdp_remove_media("video");
>>     append_hf("P-hint: video removed\r\n");
>>     rtpengine_offer("symetric direction=pub direction=priv
>> codec-transcode=PCMU codec-transcode=PCMA codec-transcode=GSM
>> codec-transcode=G729");
>>
>> But when I check the INVITE going out from kamailio,
>> I see the P-hint header but the m=video line is still there in the SDP:
>>
>> INVITE sip:user2 at 10.255.255.1997072 SIP/2.0
>> Max-Forwards: 70
>> Record-Route:
>> <sip:192.168.2.198;lr=on;ftag=837235;vsf=AAAAAEVGVUMAcUVUQkUAbhcKHnQxLmNvbQ--;did=662.4f01>
>> To:  <sip:05022222222 at 192.168.2.198>
>> From:  05011111111 <sip:05011111111 at test1.com>;tag=837235
>> Call-ID: 368391
>> CSeq: 14806 INVITE
>> Content-Type: application/sdp
>> Contact:  <sip:user1 at 192.168.2.50:7070>
>> User-Agent: Zoiper
>> Allow-Events: presence, kpml, talk
>> Via: SIP/2.0/UDP
>> 192.168.2.198;branch=z9hG4bK82de.2d1517380038597f70a08f7217851c70.0
>> Via: SIP/2.0/UDP 10.255.255.199:7070
>> ;received=192.168.2.50;branch=z9hG4bK794289;rport=7070
>> Content-Length: 518
>> P-hint: video removed
>>
>> v=0
>> v=0
>> o=71924084 8000 8001 IN IP4 192.168.2.110
>> s=SIP Call
>> c=IN IP4 192.168.2.198
>> t=0 0
>> m=audio 48882 RTP/AVP 0 8 3 18 101
>> a=rtpmap:0 PCMU/8000
>> a=rtpmap:8 PCMA/8000
>> a=rtpmap:3 GSM/8000
>> a=rtpmap:18 G729/8000
>> a=fmtp:18 annexb=no
>> a=rtpmap:101 telephone-event/8000
>> a=fmtp:101 0-15
>> a=sendrecv
>> a=rtcp:48883
>> a=ptime:20
>> m=video 48912 RTP/AVP 105
>> b=AS:704
>> a=rtcp-fb:* nack pli
>> a=rtcp-fb:* ccm fira=rtpmap:105 H264/90000
>> a=fmtp:105 profile-level-id=428016; packetization-mode=1
>> a=sendrecv
>> a=rtcp:48913
>>
>> I also tried doing the removal after rtpengine_offer()/rtpengine_manage()
>> but the same thing happens.
>> I also tried to use
>>   msg_apply_changes();
>> with the same results.
>>
>> So it seems rtpengine_offer() is executed later in the processing and
>> over the original SDP.
>>
>> Checking the docs what eventually worked was this:
>>
>> # set rtpengine to read the body from an AVP:
>> modparam("rtpengine", "read_sdp_pv", "$avp(sdp)")
>>
>> # set $avp(sdp) to a copy of $rb and replace the m=video line:
>> $avp(sdp) = $rb;
>> subst_attr("$sdp","/m=video [0-9]*/m=video 0/");
>>
>> So rtpengine would operate on a
>>   m=video 0 RTP/AVP XXX
>> line and so it would not set up rtp proxying for it.
>>
>> Then the original SDP line:
>>   m=video 10004 RTP/AVP 105
>> became this in the forwarded SDP:
>>   m=video 0 RTP/AVP 0
>>
>> Thanks.
>>
>> On Thu, Aug 25, 2022 at 3:39 PM Henning Westerholt <hw at gilawa.com> wrote:
>>
>>> Hello,
>>>
>>>
>>>
>>> already tried the sdpops module?
>>>
>>>
>>> https://kamailio.org/docs/modules/5.5.x/modules/sdpops.html#sdpops.f.sdp_remove_media
>>>
>>>
>>>
>>> Cheers,
>>>
>>>
>>>
>>> Henning
>>>
>>>
>>>
>>> --
>>>
>>> Henning Westerholt – https://skalatan.de/blog/
>>>
>>> Kamailio services – https://gilawa.com
>>>
>>>
>>>
>>> *From:* sr-users <sr-users-bounces at lists.kamailio.org> *On Behalf Of *
>>> mayamatakeshi
>>> *Sent:* Thursday, August 25, 2022 1:49 AM
>>> *To:* Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
>>> *Subject:* [SR-Users] Disabling video rtp proxing
>>>
>>>
>>>
>>> Hi,
>>>
>>> I'm using rtpengine for RTP proxying with kamailio.
>>>
>>> I use it just for audio.
>>>
>>> But eventually some terminal reinvites offering video.
>>>
>>> I don't want to refuse the request but just disable RTP proxying for
>>> video as my employer has limited bandwidth and want to reserve it only for
>>> audio.
>>>
>>> So I checked the rtpengine module documentation but it seems there is no
>>> way to restrict RTP proxying to be performed only for m=audio.
>>>
>>> I tried some things like
>>>
>>>     replace_body("^m=video [0-9]+", "m=video 0");
>>>
>>> and
>>>     subst_body('/^m=video [0-9]+ /m=video 0 /');
>>>
>>> and
>>>
>>>     msg_apply_changes();
>>>
>>> but still the RTP proxying  for video is set up.
>>>
>>>
>>>
>>> Any hints on how to solve this?
>>>
>>>
>>>
>>>
>>>
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