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A label can have a maximum of seven characters. To administer Labels for Extensions from the System Programming console:
Press System Program.
Press Exit or Start.
Press More or Right Arrow Key.
Dial the extension number that you want to administer.
Enter the label information for the extension number selected.
Press Exit or Back.
Press Home or Exit to exit programming mode.
Note: When programming on the system programming console, use the buttons next to the display to specify the letters A through I and punctuation. Use the line/feature buttons to specify additional alphanumeric characters for labels. Use the template provided with the System Programming console to see which line buttons correspond to which alphanumeric characters,
Press Feature 00 Press LEFT intercom, LEFT intercom Press right intercom. Display will ask for an extension number. Enter the extension number you want to modify. Now it should say "program ExtXX" Press * * (STAR STAR) then touch the lines in the order you want to pick them up, when finished entering the order.... PRESS * * (STAR STAR) Then Press Feature 00 to exit programming.
When you switch phones the system does not know this. All programming is stored in the system, not the phones. If you swap phones of the same model nothing should change. If you put a phone in with different button configurations then things very well may change.
It's not an easy fix. The phone system would need to be re-programmed for that phone port.
You can do a self test by pressing buttons in this order: Intercom, speaker, *, 0, 0
The phone will make noise and all the lights will flash.
If all the lights are working in self test but no in normal operation, then it's probably a programming issue. Have you had any other problems or mysterious changes in the system? Possibly after a power outage or lightning storm??