[SR-Users] Disabling video rtp proxing

[mayamatakeshi]

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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