AT&T EP5962 handset will not find base unit

SOURCE: Handset can't find base.

I just got a 3rd handset for the same phone system and were having the same error message,,, the at&t help line does not know what it is,.,. We returned it once and got another one because of the same problems, and were still having it.. AT & T help line said to return it again and try another one .. then he actually said to replace the whole phone system .. thats easier said than done! we paid 199 plus tax on the system and then another 81.00 for the third handset!

SOURCE: Handset not registering with base

You could try to clear all the memory from the base unit and start again!!!
Instructions to clear phone (Uniden 8855).
1. Go to your base unit.
2. Put your flip phone in the cradle.
3. Press down and hold down (AT ALL TIMES) the end (find hs) button.
4. Whilst holding down this button, take the power plug out of the wall.
5. Whilst still holding down the end (find hs) button, plug the power back in.
6. When you hear a beep from the base unit system.
7. Let go of the end (find hs) button.
8. Your phone memory should be cleared now and you are ready to repeat the process of registering your base and additional handsets.

SOURCE: Got instruction to unregister KX-TG6074B

Thanks for the reply, I did get the solution from Panasonic support group (worked!). Here they are:

1. Unplug the AC Adaptor from the back of the main base.
2. Hold down the LOCATOR button, while plugging the AC Adaptor back.
3. Once the base indicator lights come back on, release the Locator button.
4. After less than 5 seconds, hold down the LOCATOR button again until you get a long beep.

After doing the above procedure, you may then register your handsets to the base unit by following the instructions on page 39 of the manual

SOURCE: How do you unregister a defective handset so that it can replaced

1. Delete or listen to all voice mail messages, if necessary, to clear the IN USE/Voice Mail light indicator.
Note: Skip this step if it does not apply to your MD Series cordless telephone model.
2. Press OFF on the base station and each handset.
3. Press and hold down PAGE on the base station until the IN USE light flashes slowly, then release.
4. Press and hold down PAGE again until the IN USE light begins to flash quickly, then release PAGE.
5. Quickly and fully press and release PAGE again.
6. Please register handset displays. Press OK to begin the registration process, or press EXIT.

SOURCE: Handset won't work

I went through this exercise with a Siemens Gigaset 8800. The solution is to DE-register the handset first. Then register it with your base. This function can likely be accessed in the handset menu. The phone you purchased is apparently still registered to the previous user's base.