I'm installing CUCM 6.1 on one of my best customers but I'm experiencing problems whn connecting the PCs to the device port on the IP phones.
All the phones are connected to a 3750G-PoE and registered with the CUCM. When I attached a PC on the phone's PC port, the PC's NIC doesn't come up. I have checked the cable connecting the PC directly to the switch, and it goes fine. I have also tried it wirh different IP phones (2 7941 and 2 7961) with the same result: the PC doesn't have connection.
I have also verified that in Phone's configuration page, the 'PC Port' is enabled.
Back to basics...
Your using a straight through cable between the phone and PC?
When you say no link.. are you saying there are no green lights on the PC NIC?
Are the phones registered with CallManager and working normally? (apart from this?)