Hi

At my work we have this old phone. Yesterday it stopped allowing us to make out going calls.
We can still make out going calls with our other 3 phones.

I pick up the handset press the line number i want, but it doesn't light up that line number and i don't hear the dial tone.
If some1 is making/taking a call with any of the other phones i can see on this phone the line number light up as in-use.

I think i need to re-asign the out going lines to the numbers, but cannot find the manual for the phone.

Any Help would be appreciated thankyou.