[asterisk-users] Incompatible voice frame ulaw/alaw

[Larry Moore]

On 26/08/2012 3:45 AM, Markus wrote:
> Hi list, I'm resending this.. no one answered. No one got an idea? Thank
> you!
>
>
> When I receive an incoming call from a SIP peer where I've configured
>
> disallow=all
> allow=alaw
> (and no other codec)
>
> I can see the following NOTICE on the console:
>
> Dropping incompatible voice frame SIP/peer07-0000007c of format ulaw
> since our native format has changed to (alaw)
>
> My question is: where can I change the native format from ulaw to alaw
> (or something else)? Is ulaw, as the native format, adjustable in some
> config file or is it hard-coded into Asterisk?
>
> It doesn't seem to have any effect on the voice quality but the messages
> on the console are quite annoying.
>

I suspect you will find the frequency of these messages is the value you 
have set for rtpkeepalive.

I would suggest you include the following in your peer's configuration;

rtpkeepalive=0

Larry.