Registering handset problem

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 !!

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

The handset must be de-registered before it can be registered.
Try this:

1. To de-register the handset from another base:
When the orphaned handset says "Connecting..." or
"Out of Range..."
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 !

Reset the hand sets that are out of range by doing the following:

1) Press and hold END and # for at least five seconds.
2) Move the cursor to select Base Unavailable and then press Menu/Select.
3) Select the base which you want to de-register from, and then press Menu/Select. Base Unavailable appears.
4) Move the cursor to select Yes, and then press Menu/Select. You hear a confirmation tone,

(For DCX150 handsets)
5) Place the handset in the base cradle for about thirty seconds. Handset Registering will appear in the LCD.
6) When the handset has registered to the base, the LCD will display Registration complete then show the handset
ID number.
If the display shows Registration failed, repeat the process again.

(For DCX200 or DCX300 handsets)
5)Disconnect the base AC adapter. Then press and hold find while you reconnect the adapter. Keep holding
find until the charge LED starts to blink.
6)When charged, registered handsets display a handset ID number. Handsets that have not been registered display:
7) On the handset, press and hold # until the handset beeps and displays Handset Registering.
8) When the handset has registered to the base, the LCD will display Registration complete then show the handset
ID number.
If the display shows Registration failed, repeat the process again.



User Manual Available Here

Please check that you have correctly registered the second handset to the base. It may be necessary to de-register the second handset and then re-register it. "Out of range" just means the second handset is not within range of the base phone it was registered to.

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.

The handset/base keeps a record of who it’s registered to. The base also keeps a record of how many handsets are registered to it.

Using the de-register function on the handset deletes the handset from the base (decrements the count) and deletes the base info from the handset. All this requires that the base and handset can communicate with each other.

To remove the base data from a handset when out of range of the base, press and hold the ‘end’ button and the ‘#’ button simultaneously until the phone beeps. It will now be de-registered from the base.

However, the base will still have this handset in it’s record.

To de-register all handsets from the base, remove power and the base handset. Press and hold the ‘flash/find hs’ button while applying power. Wait for the beep and release the button. The charge light will now flash. Sit any handset in the cradle. When the flashing stops, all handsets are inhibited from connecting.

However, the handset still appears to be connected to the base unit. Pressing talk will give an ‘Unable to connect’ message. To re-register the handsets to the base, you have to de-register the handset first with the two button method.

Of interest, pressing ‘*’ and ‘#’ on the handset while reconnecting the battery is suppose to reset the handset. Doing the same on the base unit puts you in some sort of diagnostic mode. Press speaker to exit.

One idea is that the handset is not registered with the base unit. When the phone is new, you must register the handset with the base prior to use. Is this, by any chance, a second handset that you recently acquired? If so, you should be able to set it in the cradle for the base unit for a few seconds, and after that, it should be fine.

Registering Handsets to the Base
Whichever handset you choose to charge in the base is automatically
registered to the base. Any additional handsets must also be registered to
the base before you can use them.
Be sure both handsets are fully charged.
One at a time, place each handset in the base. The charge/in use LED on
the base begins to flash, indicating the base is registering the handset.
Wait for at least five seconds, then pick up the handset and press
[talk/flash]. If the display shows TALK, the handset is registered. If not,
place the handset in the base to try again.
Press [end] and continue with the next handset.
Note:
Once both handsets are registered, it doesn’t matter which
handset is placed in the base or the charger.
When you charge the handsets, Caller
ID summary screen and the name of
the handset appears.

This can be find from uniden website.
http://www.uniden.com/pdf/DXAI4588-2om.pdf

With a little searching I was not able to confirm this phone could handle more than one cordless handset. Are you replacing a defective handset or trying to add a second. If adding, do you know if it can handle the second unit (is it advertised on the box, in the user guide, etc?) If replacing, you most likely have to de-register the old handset on the base unit before you can register a new one. If you are adding, try de-registering the working handset anyway and registering the new one. If the new one registers and you cannot re-register the once working phone you will know either the system cannot handle two phones or (if the new one will not register but you can again re-register the original) that the new handset has a problem and should be returned.