Sound distortion only in a specific peer

Hi all,

I use Asterisk 1.2.22 on a Trixbox machine and I’m having the following strange new problem:

I get sound distortion on a specific peer, when listening to voice mail or make/receive a calls. The device is Grandstream 2000, I replaced with another Grandstream 2000 and the problem still exists. The same Grandstream devices work perfectly (no distortion) if I configure them with other peer accounts.

So the problem is that no matter what device I use a specific peer account has sound distortions!!! How is this possible and can anyone provide me with a solution?

Thank you in advance…