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

Brian West brian at freeswitch.org
Mon Jun 5 14:27:00 UTC 2017

Its working as designed.  You have to remember we're a B2BUA... so we have
some behaviors that may behave proxy like, but FreeSWITCH is still not a

On Mon, Jun 5, 2017 at 4:46 AM, Lợi Đặng <loi.dangthanh at gmail.com> wrote:

> Hi guys, I resend this because I guess my first email does not reach at
> all.
> Helps are appreciated.
> rgds,
> 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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*Brian West*
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