Question about AT&T 5840 5.8GHz Speakerphone/Answering/Caller ID Answering Machine

5 Answers

ATT 5840 Base reset code/procedure

I have a problem with the registration of three replacement handsets (had six, 3 broke, 3 replaced). They will not register, because the base is still holding the old handset's registration codes. I know this can be solved by resetting the whole system, but unplugging it will NOT do it. I found this post, and THAT is the solution, but the instructions are horrible. Please help, I need the reset code/procedure for the base.

http://www.phone.us/dcforum/DCForumID7/111.html

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  • 3 more comments 
  • Anonymous May 20, 2008

    Same problem, but different base. I have the 3358 base, which has no menu item for resetting the base. Can anyone help?

  • Lynnsang May 20, 2008

    Same problem, different base. I have the 3358 base, which has no menu item for the base id. Can anyone help?



  • Anonymous Feb 21, 2009

    Our 5840 base and handsets don't recognize the base code. Help.

  • Will Gates Oct 11, 2012

    I have an AT&T 5862 BC and unfortunately the instructions to use the soft keys and the mute and flash buttons did not work. Any suggestions

  • Michael Buck
    Michael Buck Jun 20, 2017

    This is the answer for the 5830 or 5840. I searched all over and nothing worked. Finally, I found this page and was fixed in a flash. Take the batteries out of all the phones, even your existing ones (set phone number one aside so you can re-register it first). On the 5840 corded base, press Menu. Press the down arrow until you see Display Base ID and press okay. The base screen will display the 15-digit Base ID code for about 30 seconds, then return to the idle screen. Write down the Base ID code so you can enter it at the handsets after you reinstall the batteries. Unplug the base for 15 seconds and remove the backup battery if you have one installed (the only thing you will lose is your time setting).

    Plug the base in. Then de-register the handsets by following the steps below:

    1. Using the soft keys on the base located below the base screen, press MENU
    2. Press the down arrow until BASE SETTINGS is highlighted.
    3. Press the OK soft key.
    4. On the base, press MUTE 3 times and FLASH twice. This will de-register the unit. I have my phones numbered to make paging easier (and easier to find a missing one!). The first phone you reinstall the battery will be phone one and so on. You will be prompted to enter the base ID number in each handset. Make sure to register each one completely before moving to the next one. Handset one may or may not register automatically. If not, register it like all the others by putting in the ID code. You may see a message that says handset rejected by base. Don't worry. Just press the "new" soft key and enter the base ID. You are now finished.

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Document.write(parent.prscreen) Try this to get it working. Relocate the handset(s) closer to the main base.

Check for any lights on the base including charge, intercom, and channel lights (if applicable to the model).

Re-cradle the handset on the base for 15 seconds. Lift the handset and press PHONE.

Unplug the AC adapter from the main base unit and take out the battery from the handset. Leave it unplugged for 15 seconds. Plug the handset battery in and re-cradle the handset. Plug back the AC adapter in and wait for 15 seconds.

Try to de-register the handsets by following the steps below:

1. Using the soft keys on the base located below the base screen, press MENU
2. Press the down arrow once until BASE SETTINGS is highlighted.
3. Press the OK soft key.
4. On the base, press MUTE 3 times and FLASH twice. This will
deregister the unit.

Below are steps on how to re-register the handsets:

1. Make sure to charge the handset battery pack at least 12 hours.
2. Using the soft keys on the base located below the base screen, press MENU.
3. Use the up or down arrow keys to select DISPLAY BASE ID.
4. Press OK. The base screen will display the 15-digit Base ID
code for about 30 seconds, then the unit returns to the idle
screen. Write down the Base ID code on a piece of paper.
5. At the cordless handset, use the soft key to select NEW.
6. Enter the 15-digit Base ID code using the number keypad.
7. Use the soft key to select OK. The screen displays PLEASE
WAIT!.
8. After about 45 seconds, the screen displays FOUND BASE. If the handset displays BASE BUSY TRY LATER, the base is in
use.

Other products that use the 5.8GHz band can interfere with the use of this phone. These products or equipments include: radio towers, page towers, cellular Phones, other 5.8GHz cordless phones, intercoms, or monitors. If any of these are in the area, they may interfere with the performance of the phone. Try relocating the phone.

Video displays, Televisions or Personal Computers can cause
interference on the phone if it is plugged in electrically with one of this equipment (typically on a power strip or extension cord). Please relocate the phone to an AC outlet without any other major appliance plugged in.
You can also relocate the base to another room.

Relocate the phone out of the kitchen area. Appliances may cause interference.

If the charge light does not remain on, clean the handset and base charging contacts using a pencil eraser. If it comes on after cleaning the contacts, you may need to charge the unit for 10 hours.

Make sure that the AC power cord is securely plugged into the base. If unsuccessful, plug the unit into a different known working outlet or turn on the switch on the power strip.

Posted on Apr 30, 2008

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Thanks!  You solved my problem!  I have the 5840 base with 4 handsets and bought two new handsets that wouldn't register until I reset the whole system as below. Then I re-registered each of the six handsets without a problem.  My setup is for an 84 year old man so he can reach a phone quickly wherever he is in the house.  Thanks again!  

Try to de-register the handsets by following the steps below:

1. Using the soft keys on the base located below the base screen, press MENU
2. Press the down arrow once until BASE SETTINGS is highlighted.
3. Press the OK soft key.
4. On the base, press MUTE 3 times and FLASH twice. This will
deregister the unit.

Posted on Jun 11, 2008

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Walter's tip worked for me as well. The answering machine messages are still there but the answering machine clock reset back to Monday, 1:30am. (it is wed, 7:30pm). That was easy to adjust, though and now my new handset is working. The handsets had to be reprogrammed individually with the 15 digit base ID code, but that just took a minute as well.

Posted on Mar 26, 2009

Does anyone know if using the procedure noted resets everything including clock, erases messages etc. Or does it just reset the base id
Thanks

Posted on Jul 01, 2008

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What those instructions should read is to press MUTE three times and FLASH twice.

That reset my phone.

Hope this helps.

Posted on Jan 24, 2008

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Posted on Jan 02, 2017

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1 Answer

DS6321 out of range, no power at base


This sounds like a registration problem, the handset(s)
and the base have lost identification with each other.

I. To address this, first de-register the handset(s) ---
do this procedure for each handset:

0. Start by taking off the battery compartment cover....

1. press [menu]
2. scroll up/down to "Settings"
3. enter * 7 8 9 0 #
4. scroll down to "next page", press [select]
5. scroll down to "Register Clear?", press [select]
6. display asks "Confirm?" or "Register Clear??", press [select]
7. display reads "Ok" and chirps, press [ off ]

8. UNPLUG THE HANDSET BATTERY (why the cover was off)

9. Wait ~30 seconds, re-connect the battery & replace the cover

10. display reads "Not Registered" ===============================

II. To register the handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #1" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a few
hours and try the registration ( II ) again.

NOTE: the base can only handle 5 handsets and will
increment the number of each handset registered
until "Handset #5" has appeared, even if some of
the handsets are lost/not in use. Trying to register
more than 5 handsets will result in "Registration Failed."
===============================

III. To clear the base of all handset registrations and
be able to start registering again at Handset #1:

1. press [Find Handset] on the base and hold past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink.
2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration
3. for multiple handsets, return to II. above and
register each handset in turn.
===============================
Good luck !!

May 02, 2016 | Vtech Lands Phones

2 Answers

Can not get the second handset to register to the base


This is the registration procedure

Step 1: press MENU-6 and select 3 “SET BASE”
Step 2: press the REG key on the master base
Step3: press register to finish the registration procedure.
• After the registration complete, handset 11 and handset 21 can
2-WAY intercom with each other

If issue persists reset the unit start registration by using 2nd unit that currently unable to register. if issue continues please inform for further troubleshooting

Good Luck

Jan 01, 2008 | EnGenius SN 920 Ultra Cordless Phone

1 Answer

Hand set says connecting even before it is reset with new base.


This sounds like a registration problem, each 'old'
handset must be de-registered from its original
base and then registered to the 'new' base.

NOTE: the CS6229 handles a maximum of 5
handsets. If you have a handset displaying
"Handset #5" then you have a 'fully populated system'
even if you actually have only one or two handsets.

You will need to clear each handset ( I ) then clear
the base of all registrations ( II ) before re-registering
each handset ( III ) up to the maximum of five.
=====================================
( I ). First, to de-register a handset ---

0. Start by taking off the battery compartment cover.

1. press [menu]
2. scroll up/down to "Settings"
3. enter * 7 8 9 0 #
4. scroll down to "next page", press [select]
5. scroll down to "Register Clear?", press [select]
6. display asks "Confirm?" or "Register Clear??",
press [select]
7. display reads "Ok" and chirps, press [ off ]

8. UNPLUG THE HANDSET BATTERY
(this is why the cover was off)

9. Wait ~30 seconds, re-connect the battery &
replace the cover

10. display reads "Not Registered"
===============================

( II.) To clear the base of all handset registrations
( if needed, else skip ahead to ( III ). )

1. press [Find Handset] on the base and hold
past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink. 2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration ===============================

( III.) To register each handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

===============================
Good luck !!

Jul 23, 2015 | Vtech Lands Phones

2 Answers

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The secret decoder key sequence, provided by AT&T tech support, to factory reset this handset is:

(right softkey "-") * 3 3 1 7 3 4 # (left softkey "-")

The handset they should beep and go into registration mode.

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The secret decoder key sequence, provided by AT&T tech support, to factory reset the TL86009 handset is:

(right softkey "-") * 3 3 1 7 3 4 # (left softkey "-")

The handset they should beep and go into registration mode.

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I am trying to replace a handeset on my E5640 answering system. I have followed the procedures to deregister the existing handsets but it will not accept the base code for the last one. The handset I am...


  • Your telephone can accommodate up to four cordless handsets. You can add new handsets (Model E560-2, sold separately) at any time, but each must be registered with the base before use.
  • The handset provided with your telephone is automatically registered as Handset 1.
  • Additional handsets will be assigned numbers in the order they are registered (2, 3 or 4). You can register a maximum of four handsets.
To de-register all handsets
• Unplug the power supply from the base unit.
• Remove all handsets from the charge cradles and base.
• Plug in the power supply while pressing and holding the HANDSET LOCATOR button.
• Continue pressing HANDSET LOCATOR until the IN USE and CHARGING indicators are lit (this could take up to 10 seconds).
• Release the HANDSET LOCATOR button.
• All handsets will display: ENTER BASE ID: XXXXXXXXXX
Once the base indicators turn off (up to 30 seconds), the handsets have been de-registered from the base, and can now be re-registered.

To re-register a handset:
• Make sure your handset batteries are properly installed and charged.
• Your handset will display "ENTER BASE ID".
• Enter the 15-digit Base ID number from the bottom of the base unit.
• Press SELECT to accept the new code and complete re-registration.

To re-register a handset to a new base unit:
• Make sure your handset batteries are properly installed and charged.
• Unplug the old base unit. Your handset will display "SEARCHING...".
• Install the new base unit by plugging it into an electrical outlet and phone jack.
• Press and hold the SELECT key until the handset displays "ENTER BASE ID".
• Enter the new 15-digit Base ID number from the bottom of the new base unit.
• Press SELECT to accept the new code and complete re-registration. The handset is now registered to the new base.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

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1 Answer

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The process is called "Registering."

From another fixya post:

1. Make sure to charge the handset battery pack at least 12 hours.
2. Using the soft keys on the base located below the base screen, press MENU.
3. Use the up or down arrow keys to select DISPLAY BASE ID.
4. Press OK. The base screen will display the 15-digit Base ID
code for about 30 seconds, then the unit returns to the idle
screen. Write down the Base ID code on a piece of paper.
5. At the cordless handset, use the soft key to select NEW.
6. Enter the 15-digit Base ID code using the number keypad.
7. Use the soft key to select OK. The screen displays PLEASE
WAIT!.
8. After about 45 seconds, the screen displays FOUND BASE. If the handset displays BASE BUSY TRY LATER, the base is in
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Did the cordless set work before?

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Once all the cordless sets are back up and working, plug in the base station and wait for about 1 minute.
This forces the base station to re-establish and link between the base station and the cordless sets.

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1 Answer

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