Kit
Mitel 5000 - v5.1
4 X ISDN 2'S
60 phones. (5312's, SIP DECT's and analogues)
Problematic phone - Mitel 5312
Scenario
In the past weeks we have a very weird problem, when a call is received or dialed, as soon as the call is dropped, sometimes the phones starts ringing displaying 'IC', the phone is then answered and their is no one on the line all you get is fresh air, so you put down the phone and it happens again straight away, This can happen up to 10x of disconnecting the call - 'VERY ANNOYING'
We have rebooted the system which managed to resolve the issue for a week or so, but it has come back.
We have tried tracing the call via system monitoring, but there is no evidence of the call their.
Its driving me nuts, please any advice would be highly appreciated!
Thanks in advance.