I am using seven 7941G IP Phones on Catalyst 3750G switch. The problem is that three of my ip phones are not powering up after replugging the ethernet cable to the ip phone. I checked the switch interfaces on these ports and it shows line & protocol down. The same port starts working when i plug the ethernet cable into the PC. Please help me in this regard.
Could be issues with the PoE power source on your switch. Sometimes the PoE components stop working and do not generate voltage on all ports. You could try using a Cisco 48V AC Adapter and see if the phones still display the same issue.
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Your phone is trying to connect to a TFTP server address to download a firmware and/or config file update. You need to figure out what IP address it is trying to connect to (You may have to use wireshark or another packet sniffer to determine this).
Once you know the IP it is trying to connect to, you'll need to set up a small network with a TFTP server running on that same address, and feed the phone a firmware update and/or config file. It will likely not fully boot unless it gets a firmware update.
These phones can take their power from a Power over Ethernet switch, where all you need to do is plug the phone in to the switch and it gets its power from there.
You can also get power cubes for these phones, but they do not come with the phone as standard, as most people like the convenience of having the power coming from the switch, and not needing to use up a further power socket in the floor/wall.
You can solve this by connecting your phone inline. On the back of the phone where the phone handset plugs into, plug one end of the jabra headset wire & connect other end to the 2nd position (marked by phone & handset). Now plug the handset wire from Ip phone to the 1st position (marked by handset) in the jabra headset. Now you are good to go.
When the phone rings lift the phone handset and answer it with your jabra headset. You can't use jabra with 7941 without lifting the handset on phone.