[Freeswitch-users] Video Upgrade/Downgrade and Transcoding

[Giovanni Maruzzelli]

Hello  Carsten,

Is the sending of video codecs to audio only endpoints causing some
problems, or is only useless but no problems?

-giovanni


On Wed, Sep 26, 2018, 14:56 Carsten Bock <carsten at ng-voice.com> wrote:

> Hi,
>
> I am using FreeSwitch Release:
> FreeSWITCH (Version 1.9.0 -n20180903T123919Z-1~jessie+1git 5dd4451
> 2018-08-31 19:05:39Z 64bit) is ready
>
> I have the following, rather simple scenario, where I can't figure
> out, how to configure it properly. I use FreeSwitch as Transcoding
> B2B-UA/SBC. All the logic is done on a Kamailio in Front of
> FreeSwitch. Thus my dialplan is rather simple:
>
>   <context name="public">
>     <extension name="other">
>       <condition>
>         <action application="bridge"
> data="sofia/internal/${destination_number}@${loadbalancer}"/>
>       </condition>
>     </extension>
>   </context>
>
> In order to provide transcoding, I have set the following in my
> internal.xml profile:
>
>     <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
>     <param name="outbound-codec-prefs" value="$${global_codec_prefs}"/>
>
>     <param name="disable-transcoding" value="false"/>
>     <param name="inherit_codec" value="false"/>
>
>     <!--set to 'greedy' if you want your codec list to take precedence -->
>     <param name="inbound-codec-negotiation" value="generous"/>
>
>     <!-- Let calls hit the dialplan before selecting codec for the a-leg
> -->
>     <param name="inbound-late-negotiation" value="true"/>
>
> In vars.xml, I have the following:
>
>   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G722,PCMU,PCMA"/>
>   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G722,PCMU,PCMA"/>
>
>   <X-PRE-PROCESS cmd="set" data="media_mix_inbound_outbound_codecs=true"/>
>   <X-PRE-PROCESS cmd="set" data="rtp_pass_codecs_on_stream_change=true"/>
>   <X-PRE-PROCESS cmd="set" data="sip_renegotiate_codec_on_reinvite=true"/>
>
> This works like a charm for all Voice-Calls, the B-Party gets an offer
> including all the codecs from the list, e.g. A-Party supports only
> G722, B-Party supports only PCMU, so FreeSwitch does the transcoding.
>
> However, it leads to issues, when it comes to Video. As soon as I add
> H264 and VP8 to the codecs list (global_codec_pref /
> outbound_codec_prefs), the call to my B-Party includes the offer for
> Video as well, even if the A-Party did not offer Video initially. Is
> there an easy way to solve this? What are the right settings for such
> scenario?
>
> I tried the following in my dialplan:
>
>       <!-- Here we check for Video to add it back into the SDP if we want
> -->
>       <condition field="${switch_r_sdp}" expression="/(.*)(m=video
> \d+)(.*)/s" break="never">
>         <anti-action application="export"
> data="nolocal:absolute_codec_string=G722,PCMA,PCMU"/>
>       </condition>
>
> This would remove the Video from the initial invite, if the A-Party
> did not offer Video initially. However, if I then enable Video at a
> later stage (Re-INVITE with m=video), FreeSwitch will not forward the
> new stream to the B-Party and then instead just send a re-INVITE with
> Audio only to the B-Party.
>
> Where did I go wrong? Any ideas?
>
> Thanks,
> Carsten
>
> --
>
> Carsten Bock
> CEO (Geschäftsführer)
>
> ng-voice GmbH
> Millerntorplatz 1
> 20359 Hamburg / Germany
>
> http://www.ng-voice.com
> mailto:carsten at ng-voice.com
>
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>
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>
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