I have a Cisco IP Phone 7940 that is acting strange. When a call comes in the panel will light, but it will not ring. This is a intermitent problem as is currently being remedied by disconnecting and reconnecting the network cable. Any thoughts on what this might be??
Also, is it possible to update a IP Phone firmware version using Call Manager via. Cisco TFTP? How can I set a TFTP server up and what is involved in doing so?