[Freeswitch-users] Freeswitch transcoding even after Late Negotiation with inherit_codec

Robert Fitzjohn rehfjo at gmail.com
Mon Sep 20 19:15:58 UTC 2021

I needed an "inherit_codec =  true" before the bridge for this to work. For
some reason, setting ringback also trips this up in some cases, but it's
been a while since I looked at this so YMMV.

On Mon, 20 Sept 2021 at 18:02, Shahnawaj Khan <shahnawaj.khan1990 at gmail.com>

> Hi All,
> I am working on a use case where we don't want freeswitch to transcode
> and the codec negotiated with the B leg's answer should be passed to
> the A leg so it also uses the same codec.
> I have followed the following link
> https://freeswitch.org/confluence/display/FREESWITCH/Codec+Negotiation
> and added following flags in sip profiles
> <param name="inbound-late-negotiation" value="true"/>
> <param name="inherit_codec" value="true"/>
>  But freeswitch is itself doing the transcoding. Scenario looks like
> the following.
> 1) Bob---(Invite with OPUS,PCMU codec)---->Freeswitch
> 2) Freeswitch---(Invite with OPUS,PCMU codec)-->Alice
> 3) Alice ---(200 OK with PCMU)---> Freeswitch
> 4) Freeswitch---(200 OK with OPUS)--->Bob  //OPUS instead of PCMU
> Please let me know if I have some understanding gaps and point me in
> the right direction.
> Thanks & Regards,
> Shahnawaz
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