Question about AT&T 3658B 5.8GHz Cordless Telephone System :

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How to de-register handset from ATT 3658B phone system. I am at max capacity and one handset has become defective. I have spare handsets, but I must de-register the defective one before I can re-register the new one. Thnaks.

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  • eckert_andy Apr 09, 2011

    Haven't tried expert's fix yet. Will try it over the weekend and respond Monday.

  • eckert_andy Apr 10, 2011

    Hi, My base does not have it's own dialpad. I tried using this code on each handsets "enter base ID" entry point and it disabled the handset, but it did not de-register it. I was not able to register the new handset. I was able to reenable all the old handsets with the base registration code. Any other ideas? Thank you.



    Andy E.

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First deregister all handsets:

Step 1: At the base, press MENU, scroll to BASE SETTINGS, then press OK.

Step 2: Using the base dialpad, enter * * 3 3 5 7 8 2

Step 3: Re-register each system handset:

At the base, press MENU, scroll to DISPLAY BASE-ID, then press OK. The 15-digit base ID number will be displayed.

Step 4: Using the handset dialpad, enter the base ID number. Repeat the registration procedure for each system handset. Each handset is assigned a number in the order of registration

Posted on Apr 06, 2011

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My V-TECH CS6229-3 phone base does not register the base phone but i can change another phone on this three phone set and it is registered and the phone


Is the handset you are trying to register de-registered? if not it will not register to another base until it is.first de-registered.
To de-register the handset do the following-
With a charged battery in the handset Enter *331734# then without pause Press and Release the Menu Select Button. You will hear a Beep. Handset would then be De-registered..
Then place the handset on the Main Base cradle and follow the instruction that come up on the handset display.if the handset still does not register then most likely the base memory is full and will have to be re-set .
To re-reset the Base:- Remove any handset from the main base cradle. Then Press and Hold the Locator or find HS or handset Locator button until the IN USE light comes on and begin to flash then release it and immediately with out pause press and release it again. That will re-set the base memory. All your handset will then be de-registered and will to be re-registered. Place each handset to be re-registered on the Main Base cradle and follow the instructions on the the handset display and they will register.

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1 Answer

At&T EL52300--one phone reads 'out of range-move closer to base.' I did--it doesn't help. Battery OK---What do I do?


It appears that the one handset has become orphaned and
must be de-registered and then re-registered.

1. To de-register the orphaned handset from the old base:
When the orphaned handset says "Connecting..." or "Out of..."
enter *331734 [menu]
and it will soon beep and display "Not registered"

2. To register the new handset to your base:
press the "Handset Locator" button on the base and hold
it until the "in use" light comes on ( ~ 4 seconds ),
then release the button and set the new handset into
the base phone cradle. After ~ 30 seconds it will beep
and display "Handset #" (next in sequence).

3: Note: the base handles a maximum of 12 handsets.

If your system was fully populated ( ie, a handset is
already # 12 ) you will have to clear all the handsets
from the base and re-register them all in sequence.
( it is the only way to 'rescue' the places occupied
by the lost handsets ).

To clear the base of all registrations:

1. Press and hold the the "Handset Locator" button
until the "in use" light lights and then starts to blink
( ~ 10 seconds ), release the button --
then press it again briefly while the "in use" light
is still blinking.

2. The base will beep and all handsets that were registered
will display "Not Registered"

3. Follow the instructions above for each handset
in turn to re-register them:
press "Handset Locator" ~ 4sec ( in-use light on ),
set handset into the base cradle, etc.

The manual is available from: www.manualslib.com
but does not fully describe these procedures.

Good luck !

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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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I had to purchase a new AT&T cordless phone system since my last set was destroyed by lightening. My old system was CL82409 and my new system is CL82209. I have 3 expandable handsets from the old...


According to the manual starting on page 52, you need to de-register all handsets then re-register the handsets one at a time. The manual covers both cordless model numbers so the handsets should be interchangeable. I have included a link where you can download the manual if you need it.

http://att.vtp-media.com/ecp/documents/product_Product/127/UserManual/1082/cl82209_manual_i3.pdf

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1 Answer

How do I deregister my handsets on my VTech 2656


To be able to register your replacement handset, you must de-register all the handsets from the VT2656 base unit.

Follow the steps below to de-register your handset(s) from the VT2656 base:

1. Take out the handset that sits on the base.
2. Unplug power from the base.
3. Hold down PAGE while reconnecting power. When the In Use light blinks, release the PAGE key.
4. Hold down PAGE key for 5 seconds. When the In Use light begins to flash, release the PAGE key.
5. The handset charging light will blink 5 times. Within 5 seconds from when it stops blinking, press PAGE once.

You must register the handset(s) by following the steps below:

1. After charging the handset, remove it from the cradle, the LCD display will read "SEARCHING FOR BASE".
2. Press "NEW" and then enter the 15-digit Base ID code, located on the underside of the VT2656 base unit.
3. Press "OK". The handset will display "PLEASE WAIT!!".
4. Wait approximately 15 seconds. The handset will display "FOUND BASE". If the handset displays "BASE BUSY TRY LATER", this indicates that the system is in use. Wait until the base unit is in the idle (on hook) mode and repeat steps 2-4.

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1 Answer

I need to deregister missing handset #1


To de-register HANDSET #1:

1) Grab any working handset which is registered to your base (so HANDSET #2 or #3 in your case)

2) Press and hold the "END" + "#" key for 5+ seconds (wait for it to beep)

3) Choose the "Deregister HS" menu option

4) Pick HANDSET #1 as the handset ot de-register (since that's the "phantom" registered handset)

5) Once de-registered, you can de-register handsets #2 and #3 directly from each handset's "normal" menu interface (i.e. press "Menu", choose "Deregistration")

6) Thereafter, if you re-register your handset, they should start at HANDSET #1, then #2, and so on.

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1 Answer

Can I use handsets from another DCT 748 unit to expand my DCT 748


Short answer:
No. This model of phone can only support 4 handsets. If you need more than that, you will need to have a second base unit.

Detailed answer:
One of my handsets went bad, and I just bought complete DCT748-4 package from a seller on eBay for a very good price. This set was used, but in very good condition. I didn't need the whole set - just one handset - but like I said, it was a good price. Anyway, I began by telling my old base unit to de-register handset #2 (the failed unit). However, I then found that I could not register the "new" handset with my old base unit because it was already registered to the "new" base unit. So, I first had to apply power to the "new" base unit and de-register the handsets. Then, I placed one of the "new" handsets onto my old base unit, and it said "Handset Registering ..." and registered just fine. Just for the fun of it, I placed one of the other spare handsets into my old base unit. It said "Hanset Registering ..." but then it beeped and said "Registration Failed." This is because I already had 4 handsets registered to my base, and the base can not handle a fifth handset.

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1 Answer

A busy signal


Hi Kevin,

Sorry for being off line so long. If you have not fixed the problem already, I would try de-registering the handset 3 (from both the base and handset), then re-register it, it should re-register as HS 3, unless 1 and 2 are vacant. If that does not do it, de-register just the handset (not at the base), then re-register it to the base, it will grab the next sequencial intercom number. If it is still failing, then the handset is most likely defective. As a last resort, you can try initializing the handset and the base. Let me know how it goes. CG

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