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@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