[asterisk-users] gsm errors

[Gordon Henderson]

On Sat, 18 Aug 2007, ram wrote:

> Hi
>
> iam using Asteriks 1.2.17
>
> Server Side ( provider Side g729)
> clients side gsm
>
> when iam calling, iam getting lot of errors like below
>
> and lot of voice breaks
>
> Aug 16 21:23:14 WARNING[9521] dsp.c: Inband DTMF is not supported on codec
> gsm. Use RFC2833
>
> any suggestions

This might sound obvious, but Use rfc2833.

But apart from that, you're transcoding from GSM (a lossy format) to g729 
(another lossy format) so audio quality is going to be quite poor. Can't 
you stick to either GSM or g729 all the way? What clients are you using 
that only support GSM? (and if they're on a LAN why not use 
G711/uLaw/aLaw?)

Gordon