Cannot activate light on feature keys display

Try a different phone on the same router, does that fix it?

Yes - download the opperator manual from net at
http://www.nd.gov/itd/files/services/voice/1140e-user-guide.pdf

You can use the mute feature to block 2 way speech

Hello, depending on the status of the call the buttons will change automatically. Be aware that you may not be the initiator of the call so you may not have all the features. I hope this helps. If not you may contact me at: http://www.liveperson.com/nortel-guy

The system has a built-in feature called "Set Relocation", which will allow you to move your phone to another active telephone jack in your office and the extension number, voicemail box, and all features will stay with your phone.

Have your system administrator turn on Set Relocation, or check your Norstar administration manual for programming details. Or, you can call your telecom service company and have them send a technician.

First I will suggest you to upgrade the Firmware....check the ringer tune and volume is OK ... or try pressing Feature key * 6 and Press 1,2,3,4 or next to hear different type of ring types .....Press OK to save it....Now Try....Further result please let us know...Thanks for being with Fixya....Good Luck

If you are running C6E or later firmware, then the following keypad sequence is used to reset all provisioning paramaters to a "factory default":
[*][*][7][3][6][3][9][MAC][#][#]
Where MAC corresponds to the MAC address of the IP Phone which can be found on a label on the back of the IP Phone.
Since a MAC address can contain the letters A-F, then letters A/B/C can be entered via the [2] key on the dialpad, and letters D/E/F can be entered via the [3] key.
For example, an IP Phone with MAC address 00:19:E1:E2:17:12 would be reset to "factory default" when the sequence **73639001931321712## is entered on the keypad.

is it a bcm 50?bcm 50 must be version 3.0 release for module to work.

1. Reset the phone by disconnecting and re-connecting power.
2. When the Nortel logo appears, press each of the four soft keys in sequence.
3. If no other configuration changes are required, press OK repeatedly until the “PC
Port? 1-ON 0-0FF” option appears.
4. Press 1 to enable the PC Port or 0 to disable the PC Port.
5. Select OK to confirm the change.
6. Restart the IP Phone.
When the IP Phone is restarted, the firmware sets the PC Port status accordingly

C1B is ancient UNIStim firmware. You cannot downgrade to it. Try converting to a more recent UNIStim version. You can download firmware from www.nortel.com/support.

here you are...
This could be the problem with your signaling server , have you checked it ??
I think it is losing connectivity of T-Lan Network.