Distortion on Pri Lines IP 406 V2

[IPmonkey]

When testing ddi numbers I have noticed distortion on PRI Channels when I dial out and back into the ip office. The system is a 406 pri 30 with DT 30 & Phone 8 modules. Initally the IP 406 was on V2.1(24) and I rolled it back to V2.0(18) but noticed the same problem.
I have erased back to factory default and still have the same problem.
Anybody got any ideas? I know users don't normally dial back into their own system but we have had a similar problem on a IP 412 with Media Gateway accross all lines.

 

[crashtest1000]

Had this today it showed up on the Sysmon as a L1 issue we are now changing the ISDN NTU and wait and see

We have also changed out the PRI card but I have never had a faulty PRI card on IPO.

Also check clocking is set to Network and CRC is on to match the network

 

[kristiandg]

We have had contunious reports of this as well at a couple of our sites. We notices that each of the channels had a 1db increase for inbound audio. This was set on each channel. Once we removed that it went away.

Kris G.

 

[IPmonkey]

Thanks guys for your replies, it turned out to be a BT problem in the exchange.