[Asterisk-Users] Codecs? - Asked to transmit frame type 256, while native formats is 8 (read/write = 8/8)

[Aisling]

Hi everyone,
 
I have an issue which is kind of a catch 22 situation. I had outgoing
calls to my new PSTN provider working perfectly. Then I started
focussing on incoming calls. It seems that I can solve an error which
gets my incoming calls working but that in turns means my outgoing calls
don't work. - Strange.
 
Anyhow I was getting an error: 
 
Process_sdp: No compatible codecs! 
And from the SIP debug I could see that the incoming SIP INVITE was
getting a sip response of 488 Unacceptable here from my asterisk server.

 
After doing a bit of searching I determined that this might be the fault
of the codec's particularly the G729 codec. So in the peer block that I
have for my PSTN provider in my sip conf I specified allow=g729.
I called my PSTN geographic number again and was delighted when the
incoming calls worked. However when I next went to make an outgoing call
(after having added in the "allow=g729" line), I got an infinite loop of
warnings:
 
WARNING: chan_sip.c: 2520 sip_write: Asked to transmit frame type 256,
while native formats is 8 (read/write = 8/8)
WARNING: codec_gsm.c165 gsmtolin_framein: Huh? A GSM frame that isn't a
multiple of 33 or 65 bytes long from RTP
 
After those warnings I thought there might be a problem with the gsm
codec so I commented the lines containing "allow=gsm" and still kept the
line "allow=g729" because as I've said already incoming calls won't work
otherwise (but outgoing will).
This however just gave another warning:
 
WARNING: chan_sip.c: 2520 sip_write: Asked to transmit frame type 4
while native formats is 256 (read/write=64/64).
When I comment this line out again I am back to my original situation
where outgoing calls work and incoming don't.
 
Has anyone any idea how I can work around this?
 
Many thanks in advance,
Aisling.
 


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