<div dir="auto">Hello Carsten,<div dir="auto"><br></div><div dir="auto">Is the sending of video codecs to audio only endpoints causing some problems, or is only useless but no problems?</div><div dir="auto"><br></div><div dir="auto">-giovanni</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Sep 26, 2018, 14:56 Carsten Bock <<a href="mailto:carsten@ng-voice.com">carsten@ng-voice.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I am using FreeSwitch Release:<br>
FreeSWITCH (Version 1.9.0 -n20180903T123919Z-1~jessie+1git 5dd4451<br>
2018-08-31 19:05:39Z 64bit) is ready<br>
<br>
I have the following, rather simple scenario, where I can't figure<br>
out, how to configure it properly. I use FreeSwitch as Transcoding<br>
B2B-UA/SBC. All the logic is done on a Kamailio in Front of<br>
FreeSwitch. Thus my dialplan is rather simple:<br>
<br>
<context name="public"><br>
<extension name="other"><br>
<condition><br>
<action application="bridge"<br>
data="sofia/internal/${destination_number}@${loadbalancer}"/><br>
</condition><br>
</extension><br>
</context><br>
<br>
In order to provide transcoding, I have set the following in my<br>
internal.xml profile:<br>
<br>
<param name="inbound-codec-prefs" value="$${global_codec_prefs}"/><br>
<param name="outbound-codec-prefs" value="$${global_codec_prefs}"/><br>
<br>
<param name="disable-transcoding" value="false"/><br>
<param name="inherit_codec" value="false"/><br>
<br>
<!--set to 'greedy' if you want your codec list to take precedence --><br>
<param name="inbound-codec-negotiation" value="generous"/><br>
<br>
<!-- Let calls hit the dialplan before selecting codec for the a-leg --><br>
<param name="inbound-late-negotiation" value="true"/><br>
<br>
In vars.xml, I have the following:<br>
<br>
<X-PRE-PROCESS cmd="set" data="global_codec_prefs=G722,PCMU,PCMA"/><br>
<X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G722,PCMU,PCMA"/><br>
<br>
<X-PRE-PROCESS cmd="set" data="media_mix_inbound_outbound_codecs=true"/><br>
<X-PRE-PROCESS cmd="set" data="rtp_pass_codecs_on_stream_change=true"/><br>
<X-PRE-PROCESS cmd="set" data="sip_renegotiate_codec_on_reinvite=true"/><br>
<br>
This works like a charm for all Voice-Calls, the B-Party gets an offer<br>
including all the codecs from the list, e.g. A-Party supports only<br>
G722, B-Party supports only PCMU, so FreeSwitch does the transcoding.<br>
<br>
However, it leads to issues, when it comes to Video. As soon as I add<br>
H264 and VP8 to the codecs list (global_codec_pref /<br>
outbound_codec_prefs), the call to my B-Party includes the offer for<br>
Video as well, even if the A-Party did not offer Video initially. Is<br>
there an easy way to solve this? What are the right settings for such<br>
scenario?<br>
<br>
I tried the following in my dialplan:<br>
<br>
<!-- Here we check for Video to add it back into the SDP if we want --><br>
<condition field="${switch_r_sdp}" expression="/(.*)(m=video<br>
\d+)(.*)/s" break="never"><br>
<anti-action application="export"<br>
data="nolocal:absolute_codec_string=G722,PCMA,PCMU"/><br>
</condition><br>
<br>
This would remove the Video from the initial invite, if the A-Party<br>
did not offer Video initially. However, if I then enable Video at a<br>
later stage (Re-INVITE with m=video), FreeSwitch will not forward the<br>
new stream to the B-Party and then instead just send a re-INVITE with<br>
Audio only to the B-Party.<br>
<br>
Where did I go wrong? Any ideas?<br>
<br>
Thanks,<br>
Carsten<br>
<br>
--<br>
<br>
Carsten Bock<br>
CEO (Geschäftsführer)<br>
<br>
ng-voice GmbH<br>
Millerntorplatz 1<br>
20359 Hamburg / Germany<br>
<br>
<a href="http://www.ng-voice.com" rel="noreferrer noreferrer" target="_blank">http://www.ng-voice.com</a><br>
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