Adding CO line to system

[LPNMRK]

The first three buttons in the top row of the dterm 80 phone have CO lines 1, 2 and 3. We hooked up a new CO line to the system and would like to program the fourth button, which is currently not programmed, to hit this new CO line 4. How can we do that?

Thank you.

 

[belevedere]

What system is this?

 

[LPNMRK]

Elite IPK. When I press Feature + the first three buttons, they show CO Line 1, CO Line 2 and CO Line 3.
When I press Feature + the fourth button, it shows "Unused."

 

[belevedere]

Place trunk 4 in group 1, MB 3 TRF 03
Set trunk 3 to MF in MB 3 TRF 92
Set trunk 4 to line key 4 in MB 4-12 for telephone port 04. verify port by pressing FNC + 4 at the phone.

Get a programming manual at

http://www.wedophones.com