[Freeswitch-users] Cannot force transcoding between PCMU and PCMA

[Mike Jerris]

Absolute_codec_string is how you would force only an individual codec out the b leg as you’ve noted.  The other ways are about passing through the a leg codecs with some preferences and tweaks, mix adds our other codecs at the end.  These codecs are offered to the b leg then it chooses which to use.  If you ONLY want to offer PCMA out the b leg, absolute_codec_string is the right way.

> On Jan 23, 2020, at 8:14 AM, Kliment Toshkov, Netfinity JSC <kliment.toshkov at netfinity.bg> wrote:
> 
> Hello,
> 
> I have to force transcoding between PCMU and PCMA in the following scenario:
> 
> Customer [PCMA, PCMU, G729] > Kamailio > Freeswitch 1..N > termination gateway [PCMA]
> 
> I need transcoding from PCMU and G729 to take place on Freeswitch boxes. Currently it works for G729 but for PCMU calls they are originated with PCMU.
> 
> Inbound profile:
> <param name="inbound-codec-prefs" value="$${global_codec_prefs}”/>
> <param name="disable-transcoding" value="false"/>
> 
> Outbound profile:
> <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/>
> <param name="disable-transcoding" value="false"/>
> 
> vars.xml:
>   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=PCMA,PCMU,G729"/>
>   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMA"/>
> 
> 
> In xml dial plan:
>               <action application="set" data="inherit_codec=false"/>
>               <action application="set" data="media_mix_inbound_outbound_codecs=true"/>
> 
> But the calls are still not transcoded between PCMU and PCMA.
> 
> Only one thing worked - forcing the codec in bridge app:
>                 <action application="bridge" data="{absolute_codec_string='PCMA'} ..."/>
> 
> But I really need to know what I am missing and how to fix it using config files only. Brute force is not preferred.
> 
> Thank you!
> 
> Kliment Toshkov
> Key Accounts
> 
> 24/7: 0700 30000 w: www.netfinity.bg <http://www.netfinity.bg/>
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> 
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> 
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