Hand set not ringing or making any noise at all. mute is not on

If there is a Dnd butto programmed, it will be located on the top right hand side. By pressing the do not disturb button the ring wil be abbreviated. otherwise it you will have to go into the phone system programming to make that phone not ring.

Have you checked the switch on the top left of the phone?
That's the mute switch. Flip it in the Up position and that should fix your problem
If the phones ringing when you test the ringer in the settings, the ringer works. It's probably just muted..
I hope that helps...
Thank you

These are the instructions from the manual, which I found here:

http://safemanuals.com/user-guide-instructions-owner-manual/GE/21028GE3-A-_E


RING SELECT (FOR ANSWERING MACHINE)

This feature lets you select the number of times you want to phone to ring
before the answering system answers a call.

1. Make sure your phone is OFF (not in talk mode).
2. Press the MUTE/PROG button to go to the main menu.
3. Press CID/VOL (up or down) button to scroll to HANDSET SETUP.
4. Press MUTE/PROG button to confirm.
5. Press the CID/VOL (up or down) button to scroll to the RING SELECT menu.
6. Press MUTE/PROG button to enter the menu. RING SELECT 3 4 5 6 TS shows in the display.
7. Use the CID/VOL (up or down) button to scroll to the your selection. The default setting is 5.
8. Press the MUTE/PROG button to confirm. You will hear a confirmation tone and the new setting shows in the display.

NOTE: If you select Toll Saver (TS) the unit answers after the 3rd ring if there
are NEW messages, OR the unit answers after the 5th ring if there are NO new
messages. This allows user to access their answerer from another location and
then hang up after 4 rings to save long distance charges.

It can vary from u-joints to the ring & pinion. You will need to apply pressure to the DRIVESHAFT to inspect the u joints for looseness. Generally u can move the driveshaft by hand when the trans is set in nuetral to check the ring & pinion for noise
Turn it back & forth quickly to hear any noise

have you checked to make shure all mute is turned off. go to menu then select settings go to sound settings turn mute off

go to the phone settings maybe your phone are muted make it unmute and did you try to replace speaker, maybe one of his wire are desconnected

You can use Do Not Disturb feature
Feature 85 - On
Feature #85 - Off
Cheers

In these sets, I have found that the squealing is caused by the horizontal transformer. It is caused by a part (usually a coil or transformer that is vibrating).
My shop will take a pencil ( with eraser) and just barely touch ( with the eraser side) the component that we think is making the noise. If the pitch changes or goes away completely then that is the part that is making the noise. If not, then we move on to the next suspected part.
When the part is found, unplug the set and apply a solution around the coil or transformer. The solution we use is fingernail polish ( I know, we are professionals, but, it has worked for us over 35 years). Let it dry, about 10 to 15 minutes.
When trying to detect the noise, the set must be running, do not put both hands inside the set at the same time and do not touch any part of the ground with that second hand.
Any questions, respond to this post and I will respond.