I have had this issue sometime when the agent suddenly cannot log on to the selected device although that it worked the day before. The solution was then to do a hard resett (pull the powercord) on the hard phone so it did a total reboot and reregistered to call manager. Then it worked again to log on to the device. Try this
i wana thank you all for your responses,they were really very helpful.The login problem has been sorted.i had to associate the device with icm in the Application User page of User Management in the CCM as suggested by Branmill in his response.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...