asterisk users - Apr 2006 - Noise on IAX or SIP trunk between 2 Asterisk

Hi everyone:

My escenario is:

Meridian PBX (Connected to the PSTN) is connected to Asterisk-1 via PRI T1, 
the Asterisk 1 is connected to Asterisk 2 via IAX trunk or SIP trunk, the 
Asterisk 2 is used for predictive dialer with Answer Machine Detector, so 
for some reason, the AMD is starting at the moment the first ring  back is 
detected, wich is not a normal behavior, because the AMD detect words. So 
finally i found the source of the problem: When the call is start to ring 
back generate some noise afecting to AMD.

Any idea why the trunk or my configuration generate noise when the call is 
connected.?????


Regards.

Cristian.

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