Call quality over scn problem

[kovy]

Site A:
IPO 500 w/PRI/SIP trunking/VMPro/Mix of Dig/Analog/IP sets

Site B:
IPO 500 w/Dig and Analog Sets, the only outside connectivity is an SCN trunk to site A.

At site B, all calls across the SCN are clipping, playback of any recording/message from the VM is tinny/fades in and out.

I have more than enough bandwidth across the SCN, fiber all the way (only about 5 miles). My SCN lines appears to be configured correctly. My tech support (Catalyst) says I am good, my network guy says I am good - but I am far from good! Please offer suggestions. Thanks

 

[kovy]

Avaya "recommends" starting right to left
That should be left to right