[asterisk-dev] Re: Help with 240 samples on frames read from chan_iax

[Tony Mountifield]

In article <c4d05cbe0611041120q602b5ec2k6002589394cd30f6 at mail.gmail.com>,
Moises Silva <moises.silva at gmail.com> wrote:
> Hi everyone. I know app_conference is not formal part from Asterisk,
> but I think you may help me a bit to understand what is happening
> here.
> 
>   app_conference is working just fine, except when receives frames
> with 240 samples, it seems is somehow hardcoded to expect frames of
> 160 samples, so when receives 240, a buffer overflow ocurrs on the mix
> buffer and crashes Asterisk. Frames with 240 samples, so far, are just
> generated by my IAX2 connection with other server, so, if I enter a
> conference with a SIP channel using ULAW, ZAP channel using SLIN, and
> IAX2 channel (kiax softphone) with ULAW, everything works fine, but at
> the moment the other IAX2 server enters the conference (ULAW also),
> everything crashes.
> 
>   I can stop asterisk from crashing modifing the app_conference code
> to NOT mix 240 samples frames, and works, but obviously the voice from
> the IAX2 server is not received by the other parties.
> 
> Can somebody just give me a hint about where to look?
> 
> Why just that IAX2 server generates frames with 240 samples?

One possible idea - is the phone on the other side of that server
negotiating the iLBC codec with 30ms packet size?

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org