[Freeswitch-users] About proxy-hold codec re-negotiation behavior.

Lợi Đặng loi.dangthanh at gmail.com
Mon Jun 5 09:46:46 UTC 2017

Hi guys, I resend this because I guess my first email does not reach at all.
Helps are appreciated.
Loi Dang

On Mon, May 22, 2017 at 5:49 PM Lợi Đặng <loi.dangthanh at gmail.com> wrote:

> Hi list, I'm using FS with *proxy-hold*.
> Call flow is simple
> A -> FreeSWITCH -> B
> Assume FS, A and B support PCMA and PCMU, FS prefer PCMA in codec-prefs
> profile configuration.
> In affects of my configuration for *greedy early negotiation* and *disable
> transcoding*, PCMA is negotiated in both legs for initial INVITE, that's
> good, and expected.
> But then I remove PCMA from A and compose a re-INVITE for holding with
> PCMU only, the a leg is re-negotiated with PCMU, but the b leg have
> re-INVITE with PCMA due to *proxy-hold* variable, that causes transcoding
> happened after hold.
> My desire is to have FS to re-negotiate with b leg too, not so similar but
> as what I observed when I was using it with media proxy option ( A-A before
> hold, U-U after hold).
> I tried late negotiation in this case, but no luck.
> So is that not able for FS to re-negotiate codec on b leg, in using
> proxy-hold?
> Any advise is appreciated.
> rgds,
> Loi Dang
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