This is baffling me and my techs....
We have a site that has an STSe (brand new) and an OHP-6000 digital MP3 MOH unit attached.

They have 3 D&E lines (CLEC) and 2 Verizon lines connected to the KSU. When a call is put on hold the 3 D&E lines have a really bad intermittant static noise that completely blocks out the MOH music for a few seconds at a time....it happens about every 8 to 10 seconds. The weird thing is when that same call is picked up off of hold by the user there is no problem at all....call is clear as a bell. The problem is only there when on-hold.
To make matters even more confusing it does it not matter what music-on-hold device is used and we even tried another KSU...same thing.
Now, if we put one of the 2 verizon lines on hold there is no problem even if we swap a verizon line into one of the co ports where the D&E lines were????

D&E is of course claiming that the problem is not in their lines.
The customer is getting frustrated with the old "it's not us it's them" scenario and we don't know what to do next....eliminating the MOH is not really an option since that was a big selling point for the system.
Has anyone run into this scenario before?