Solution Usually, Port Fast is disabled. Enable Port Fast on the switch to fix this. If there is latency in your network, it will take longer than usual to register. Problem Getting call drop outs. This is usually a network problem.
Solution Look to see if they are on a shared network .
No problem when dialing other numbers. This is actually not a problem. This message occurs because there is only one phone locally connected to the Call Manager. Once you connect and register another IP phone to the Call Manager, this message will disappear. The SCM.INI file can be modified so that it won't generate this message when there is only one phone registered with the Call Manager.