[Freeswitch-users] Does FS supports speex with ptime=40?

[mayamatakeshi]

On Thu, Apr 28, 2011 at 11:32 PM, Brian West <brian at freeswitch.org> wrote:

> Nope.
>

Brian, thanks.
But could you elaborate a little?
Is this an issue with the underlying speex lib? It is not possible or hard
to make it work with ptime=40?
If it is possible but not implemented due to lack of users, we could offer a
bounty.
(the issue with x-lite not advertising ptime=40 I think I can solve with
opensips/kamailio in front of FS, by correctlng the SDP).

regards,
takeshi


> On Apr 28, 2011, at 8:18 AM, mayamatakeshi wrote:
>
> > I am testing making calls with x-lite 4. Although it doesn't send a ptime
> in
> > its INVITE/SDP, i can see it is sending RTP using ptime=40 as I can count
> 25
> > UDP packets per second.
> > When I try to bridge this to PSTN which responds with PCMU, at the PSTN
> side
> > I hear trembling/metallic/robotic audio.
> >
> > I was suggested to set FS to use ptime=40, so I've tried setting codecs
> with
> > speex at 8000h@40i
> >
> > But it doesn't work. I get: "488 Not Acceptable Here" (Reason:
> > Q.850;cause=88;text="INCOMPATIBLE_DESTINATION)
> >
> > So it seems only ptime=20 is supported as listed here:
> > http://wiki.freeswitch.org/wiki/Codecs#Transcodable_codecs
> >
> > Could mod_speex be changed to work with ptime=40 too?
> > Or is there anything else that i can try?
> >
> > regards,
> > takeshi
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