We have a NEC SV8100 that is having an issue with the MOH when involving a PRI channel(IP Flex circuit) The music sounds great as BGM on a digital station, so it is NOT the source. I have tried several diferent music sources all with the same result. I have adjusted the gain in 10-4-03 up and down. I do not have a SLT port or I would test using a loop around (SLT port to analog CO port) and test that way. Any ideas ? Carrier ?