My Nortel Meridian M2008 phone will not ring

Hard to answer because your problem description does not match the part.
Nortel Meridian M7208 Corded Phone is a digital phone which works off a phone system.Also note that the carrier controls the rollover, not the phone or its system.

Once you have more/proper details maybe you can be helped.

Press Feature * 3
press the 5th line key you want to use for paging
enter the page-all code (feature 601-603 as you wish)

You will need to go into programming and set all the phones to ring.
Log in: Feature **266344, 266344
Scroll to Configuration > Line Access > Enter set number > Scroll to Ringing> Then go to each line and set it to ring.

You can use the do not disturb function on your set. When used it will stop all ringing on your set(both line ring and intercom ring). To turn on DND, press feature 85, to turn the DND back off press feature #85.

Incoming line ring settings are in the config menu under:
2nd option - Line access
enter extension number
2nd option - Ringing
Ringing then can be toggled on or off for each line assigned to that extension.
Mark

You could have a CICS, and MICS or a Nortel BCM. Which do you have?

You will need to access admin programming, do you know how?

Keep looking under Terminals and Sets for your extensions. Lines either Appear or Appear and Ring.

Carl

following a power failure, the only phone that rings is the one in reception. light still flashes but no ringing from any other phones

Yes, press Feature 4, then enter the extension of the line you wish to forward the ring to. You can also go into the phone configuration to forward after a set # of rings. To ring another extension at set times you will need admin access.

you pbx is bad