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