I have a Cisco 2801 connected to a Nortel Option 11c PBX via 2 x isdn bris.
Everything works great apart from voice breakup in 4 out 5 calls.
There is no packet loss, crc or any errors on any interface.
The breakup sounds a bit like VAD but its turned off on the Cisco.
Gain,attentuation and echo cancel are default.
The bris are configured as slave and qsig.
Whats the best method to troubleshoot this?
I've tried the sh voice call and sh voice-port commands and there is nothing noticeable.
Any help much appreciated.