[chan-capi-users] Garbled playback to BRI

[Armin Schindler]

On Sun, 17 Jan 2010, Jim Hickstein wrote:
> My Asterisk 1.4.29 is now talking to my ISDN BRI in both directions, via my Diva
> Server 4BRI-8M PCI 2.0 card, at least for one call at a time (separate problem).
>  It can connect a SIP station to a call on the BRI, in or out, and the audio is
> great.
>
> But when I use the Asterisk Playback() function, on a call coming in the BRI,
> the audio sounds a bit gravelly.  It's understandable, but it sounds a like a
> scratchy vinyl record.  This is playing tt-weasels.gsm, but I found a ulaw file
> of the similar thing and it does it, too, exactly the same.
> Playback(tt-weasels) to the SIP phone sounds perfect.
>
> That is:
>
>  SIP <-> BRI           Good
>  Playback(gsm) -> SIP  Good
>  Playback(gsm) -> BRI  Scratchy
>  Playback(ulaw) -> BRI Scratchy
>
> Any clues?

Did you set the config to ulaw (default is alaw)?
If you use allow=ulaw in capi.conf, please try without it to
disable vocoder.

Armin