[asterisk-users] E1 PRI to and from SIP screeching

[Peter Lindquist]

Hi all,

We have just set up trixbox latest with a Rhino r1t1 card, hooked up to 
a plain E1 PRI line. We call fine SIP to SIP, but as soon as we make a 
call from SIP to PSTN all sounds become unintelligible screeching or 
static kind of noise on both ends, when we call PSTN to SIP the PSTN 
side seemingly OK at least we hear no screeching sound, but the SIP side 
is a even worse screeching sound. To be certain all is as plain as 
possible we disabled all echo canceling, and we use only alaw.

Any ideas on what this can be and how we start troubleshooting this?

Best regards,

Peter