Cisco 7960 turns it self off

verify your connection to the Cisco phone and also that the headset port is turned on.

I would first get a new Ethernet cable and try it. If that doesn't fix it, call your cable company and have them do a diagnostic from their end. They can tell if it is their equipment or not. It their modem is OK, and the Ethernet cable is OK, then your LAN (Ethernet) card is either going bad, or possibly not completely inserted in the socket. To check: turn off and unplug your PC. Take the side off, look where the Ethernet cable goes into your computer. If it is on the motherboard, you may want to get a LAN card and use it instead of the onboard. If the cable goes into a card plugged into one of the slots, make sure it is fully inserted. If it is, you may want to get a new card.

You can try a couple of things: Unplug the power cable from the phone, hold dows the # key, and then plug the power cable in again. The phone begins its power up cycle. Release the # key after the Speaker button is no longer lit. You should see the following message on the phone: "Reset key sequence detected" Press 123456789*0# within 60 seconds after the Headset, Mute, and Speaker buttons begin to flash. If you enter this key sequence correctly, the phone displays this prompt: Keep network cfg? 1 = yes 2 = no In order to maintain the current network configuration settings for the phone when the phone resets, press 1. In order to reset the network configuration settings when the phone resets, press 2.
Or to perform a full reset: Press **#** to reset the Cisco IP Phone 7960

Unplug the modem and router, plug them back in. Wait ten minutes and restart your computer.

How to set a Cisco IP phone to factory default Reset configuration of Cisco IP Phone (7910, 1911, 7940, 7941, 7960, 7961)

To set the Cisco IP phone to factory default completes the following steps: should be completed:

For 7940, 7941, 7960, 7961 phones:

1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when lights start flashing.
3. Press 123456789*0#.
4. Press 1 to keep network configuration or 2 to lose the network configuration.

For 7906G and 7911G phones:
1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when MWI starts flashing.
3. Press 3491672850*#.

Best and easiest way is to plug it into a newer callmanager. The firmware will be upgraded regardless of wether or not it is able to register.

to use an Ethernet phone you will need a VOIP supplier ( You will need to Google this for the country you are in ) . You will not be able to use it until you have these set up. Ethernet phones are not like a standard home phone which use your local exchange to route your calls they use servers on the internet to do that and route your call to landlines.
I hope this helps if so please give me a thumbs up

when the booting all light are turn on that's normal , after few second ethernet light momently on because ethernet chip internaly loop and check the ethernet chip that why you seen the ethernet light momently on after that ethernet should lit on if you connect router ethernet link to pc or ethernet switch.
pls check the ethernet cable , if you connect to ethernet switch pls try with cross over cable and if you connected to pc pls check duplex to auto or forced to 100 Mbps

If you can plug the cable that you have ran into your router into your computer directly and it works, then you can plug the router back in. Then connect the computer to the router via cable and unplug the router for about 15 seconds and plug it back in. If you connect the computer by cable directly and it doesn't work, then try unplugging your router for about 15 seconds and then plugging it in. I have found many networking items that need to be reset whenever a network cable is plugged in when the device is powered on.

Then you need power adapter for Cisco 7960 IP phone ( -40V DC).
Cisco phones work best with Cisco, and sometimes ONLY Cisco switches.

One question which voice gateway you will use for your 7960 VoIP phone calls to go through ?
(AT&T probably supports only their IP Phones with special and usually hidden settings from end user)