[Freeswitch-users] Sofia late-negotiation on re-INVITE (codec-modification)

[Visciano Giovanni]

Basic call SIP vs SIP with:

<param name="inbound-late-negotiation" value="true"/>
<action application="set" data="inherit_codec=true"/>
<param name="renegotiate-codec-on-reinvite" value="true"/>

This help to avoid FS transcoding, the SIP endpoints negotiate codec end-to-end.
FS still in the media path but no transcoding applied.

INVITE [pcma,g729] ---> FS ---> INVITE [pcma,g729]
200 OK [pcma]      <--- FS ---> 200 OK [pcma]



If a SIP ep send a re-INVITE for codec modification, sofia negotiate the new codec on that leg without "asking" the remote party. This result in transcoding and since I have mod_g729 only in passthrough mode the call is released by the core.

re-INVITE [g729] ---> FS
200 OK    [g729] <--- FS


*************
It seems that "late_negotiation + inherit_codec" doesn't apply to a codec modification.
Do I miss some configuration options in the SIP profile?
(Note: I cannot use proxy-media/no-media mode in my configuration)
*************


Regards
Giovanni


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