There are a PSTN, Cisco 2821 with two E1 ISDN streams and CCM6:
CCM6 <=(eth)=> GW2821 <=(two E1 controllers)=> PSTN
The problem is that the engineer of digital stations says that first 11 channels in first E1 stream are blocked by station due to some troubles with them.
When I try to see the ISDN status or E1 controllers statuses on GW2821 everything is ok.
How could I find out what is wrong with these first 11 channels in first E1 ?