I have 2821 Communication manager express with 6 Nos. 7942G IP Phones & 10 Nos. 7911 IP Phones in network.
Everything working fine. But, Once every 2 months, i am getting problem with couple of 7911 IP Phones that it can receive incoming calls, But CAN NOT MAKE OUTGOING CALLS.
In order to resolve this problem, I am creating new ephone-dn directory number and assinging same ephone-dn to specified ephone number. & removing old ephone-dn directory number for same. Then those particular 7911 IP Phones can make outgoing calls.
and i have to reset those IP PHones & have to reconfigure it.
Is there any specific solution or troubleshooting for this kind of problem???