asterisk users - Sep 2007 - Choppy sound while converting alaw to ulaw

Hi there

I europe alaw is usual. I have a SIP Phone which perferes ulaw.

When my * box has to transcode alaw to ulaw the sound get's one way choppy. 
(alaw => ulaw is choppy, ulaw => alaw is fine).

I managed to fix the issue by forcing my SIP phone to use alaw only, but is 
this a know issue with asterisk 1.2.13?

-Benoit-

Benoit Panizzon wrote:
> Hi there
>
> I europe alaw is usual. I have a SIP Phone which perferes ulaw.
>
> When my * box has to transcode alaw to ulaw the sound get's one way
choppy.
> (alaw => ulaw is choppy, ulaw => alaw is fine).
>
> I managed to fix the issue by forcing my SIP phone to use alaw only, but is
> this a know issue with asterisk 1.2.13?
>
> -Benoit-
>
>
>   
I do not believe that there is an issue in Asterisk.  Is this a heavily 
used box?  What does top show when making the call that is choppy. 

When you say your phone "prefers" it, do mean alaw is listed before 
ulaw?  It that is the case, then it does not prefer it, it just came 
that way, default from the factory.

Anyways, I find if bandwidth (and that is not even the case for 
ulaw/alaw) is a problem then transcode.  If you do not have to 
transcode, use the same codec end to end.  Then it is just passing data 
on the wire and not CPU intensive.

Thanks,
Steve