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

[mayamatakeshi]

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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