Call manager V4.1(3) with 2821 MGCP gateways. Inbound calls from 30 Channel BT bearer fail intermittently. The internal IPT handset rings once and the call disconnects.
BT say that there are no issues with the circuit?.
No issues are experienced with outbound calls.
No IP routing problems are apparent between gateway and Call manager etc.
Any ideas on how best to troubleshoot would be appreciated.