[Freeswitch-users] Video Upgrade/Downgrade and Transcoding

[Joel Serrano]

Hi Carsten.. I checked and I have the codecs settings like you.. Can't help
more there sorry.
Joel.

On Thu, Sep 27, 2018 at 11:02 AM Joel Serrano <joel at textplus.com> wrote:

> Hi Carsten,
>
> I have a setup exactly like that... I’ll get you the combination of
> settings I have for FS to handle the codecs.
>
> As for your second problem, I can tell you it will not work, I have a
> quote from FS devs to implement the reinvite with video but as of right now
> you cannot switch from audio to audio+video (unless you proxy_media which
> of course you don’t want).
>
> Joel.
>
> On Wed, Sep 26, 2018 at 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
>>
>> Office +49 40 5247593-40
>> Fax +49 40 5247593-99
>>
>> Sitz der Gesellschaft: Hamburg
>> Registergericht: Amtsgericht Hamburg, HRB 120189
>> Geschäftsführer: Carsten Bock
>> Ust-ID: DE279344284
>>
>> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
>> http://www.ng-voice.com/imprint/
>>
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