Question about Uniden DCX640 Cordless Expansion Handset (unidcx640)

1 Answer

Handset Fails to Register

I needed replacement for the 2 extra handsets for my Uniden DCX640 phone system that were in use until they wouldn't work, just reading "Welcome.. Please wait". So purchased 1 additional handset..the instructions were to place it on the main base to register it...but it "fails to register"...any suggestions

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  • gshort Aug 28, 2008

    I purchased a used dcx 640 to expand my 3 phone system. It is already
    registered as handset #2 and will not register as handset #4 and is
    therefore useless. Any suggestions on how to get this to work?

    I'd appreciate any help in resolving thie issue.



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  • Expert
  • 98 Answers

It is quite possible that you'll need to go into the menu settings on your base-unit and reset the unit or restore factory default, whichever option it gives you. Also, look in the menu on the phone to see if there is an option to reset the handset also. After resetting the unit and/or handsets, try to register the handsets again, one at a time. If that still does not fix the problem, you may have handsets that are not compatible with your system, or your system may not be able to support that many phones. However, if you have the right handsets, and your system can host that many handsets, then I'm confident that resetting the unit and re-registering your handsets should fix your problem.
Hope this helps! Have a nice day!

Posted on Nov 23, 2008

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Posted on Jan 02, 2017

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There is a message "Searching" on the phone, How do I get it back to working.


You might try to de-register the handset and re-register
it to the base. Be sure the handset's battery is well
charged, a weak battery can impede the registration.

( I ) To de-register the errant handset:

1. Press and hold the [END] and [ # ] keys at the same time until the screen displays
"System Reset, Deregister Handset"
2. press [select]
3. scroll to "Base Unavailable"
4. press [select]
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( II ) To register the handset to the base:

1. open the base display's [menu]
2. scroll to "Register Accy."
3. press [select]
4. on the handset, press and hold [ # ] until
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5. In ~30 seconds, handset display will say
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This is described on page 22 of the manual.
A free copy of the User's Manual can be obtained
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Good luck!
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The following is taken directly from the SSE37 owners' manual:

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First make to get a compatible handset.

For the Uniden D1660-2, the compatible handsets are DCX160 and DWX337. Make sure that you have not exceeded the number of handsets that the phone can support. The D1660-2 can support 12 handsets unless you use any DWX337 handsets. Then the limit is 6. (If you have more handsets, you will need to deregister some of them first.) Then allow the handset to charge. If the handset is reading "not registered", then place it into the base unit. You should see "Handset Registering" for about 30 seconds; then it will read Registration Complete. The manual for the Uniden D1660-2 is available here: http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/D1660-2om.pdf . This is the most common Registration for Uniden phones; there are a few exceptions (depending on the base or the replacement handset). Check the appropriate manual (see below to find the manuals).

For the DECT4096, press Menu on the base and then navigate to Handset Register. When you see Handset Registering on the base display, press and hold # on the handset to be registered until you see Handset Registering. (It takes about 2 seconds.) After the display changes to Handset Registered, check for dial tone.

On a few Uniden phones, there is a Page/Handst Register button on the base. On those you navigate through the Handset menu to Handset Register (Menu > Handset menu > Handset Registration). Then press and hold the Page button until you hear a beep. Then wait for the registration to be completed.

Most Uniden manuals are available here: http://www.uniden.com/scat/cordlessphones_mnl . Select your type of Uniden phone and scroll through the list to your model or use the search box to directly search for your phone and the manual.

I hope this helps.

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1 Answer

HOW DO U CONNECT THE HANDSET TO THE BASE.ALREADY TRIED THE REGISTER BUTTON,DID NOT WORK.IT CAME WITH NO DIRECTIONS,WE BOUGHT AT A FLE MARKET FOR 5 DOLLARS.


Are you sure of the model number? The D1680 should register the handset when you put it on the base for 30 seconds. (You should see Handset Registering followed by Registration Complete.) Then press Talk/Flash to check for dial tone. On this model if the registration fails, charge the battery (or replace the battery and then charge that). Then repeat the registration.
The manual for the Uniden D1680 is available here: http://news.uniden.com/pdf/D1680om.pdf .

For other Uniden phones, like the DEC1060, you need to navigate through the handset menus to find the Handset Registration command. Then press and hold the Register Handset (Find Handset) key on the base for 3+ secondsThen the base and handset will synch. (Low batteries could interfere with the process.)

For the D3288, you access the base menu for Register Accy and then press and hold # on the handset for 30+ seconds. (You will see Registering followed by Registration Complete.)


Additional Uniden cordless phone manuals are available here: http://www.uniden.com/scat/cordlessphones_mnl .

I hope this helps.

Cindy Wells
(with a flea market phone, my first suggestion is to try a new battery for the handset. They only have a given number of recharge cycles and you do not know the history. However, sometimes the chargers do fail and a new battery will not work. In that case, the phone should be replaced. It isn't worth the cost of out-of-warranty repairs.)

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On the handset, press and hold # until the handset beeps and displays Handset Registering.
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DSL filterTelephone cordTelephone wall jack
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Base Unavailable (Handset Only)
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