We have one base and 3 handsets. Two of the handsets have developed the same problem,at about the same time! When the phone rings or you want to place a call, pressing either line button does nothing. It won't activiate a line and you can not call or talk. There is no physical damage and the units are clean. We have tried unplugging the batteries and then reinstalling power to the units hoping to reset some electronic function but this doesn't work.
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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??",
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
( 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
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.
I had this happen suddenly on 2 out of 3 handsets with a DS6151 base and DS6101 handsets. Well, what happened is there was no dial tone on either of the 2 handsets on either of the 2 lines and a message appeared on the display "Unable to Call Try Again" after some delay, if Line1 or Line2 button was pressed.
Oddly, the 2 that did not work were the ones normally on "extension" chargers and the 1 that did work was the one on the base unit. That caused me to suspect the base unit .. which it still may have been but the solution was NOT. And, also odd, the handsets seemed to still be synched with the base unit in many respects.
Cycling the power on the base unit did nothing.
These are fairly new units and battery life is generally much longer in my experience.
- Remove the battery from the handset that doesn't work properly.
- Re-install the same battery.
Whatever was wrong, this reset it and the handsets started working again.
Depending on the model no of your phone, your phone has the option to choose between "Line1" and "Line2" from network settings. You can either choose "Line1" from the settings or restore your phone to factory defaults,
make sure your wiring that connects lines from dmarc into the unit is consistant. Line1 must be line1 on all phones, line2 must be line2 etc.
After line appearance verified follow instructions in the manual and everything should work. If it doesnt contact manufacturer for assistance
Most of the Cordless 2 line phone BASE UNITS have the connections on the back for line1/line2 or seperate line 1 and line 2 connection. If you have the type of phone with the line1/line2 jack you have to be sure that both lines are on the same wall jack, otherwise make sure the phone you purchase has seperate line jacks and you will have two phone cords going to the base unit.
Same manual as lethean provided on a similar post but Page 24 if the previously used Base is Unavailable and your phone shows "Deregistration" in the Menu.
Base Unavailable (Handset Only)
To clear the base registration data in the handset, please follow these steps:
Press and hold  and [#] for more than 5 seconds. Select the BASE UNAVAILABLE submenu.
BASE UNAVAILABLE appears. Move the cursor to select YES, and then press the OK soft key.
ARE YOU SURE? appears. Move the cursor to select YES. Press the OK soft key.
Uniden TRU8885-2 Cordless Phone > User Guide
E X P A N D I N G Y O U R P H O N E w w w . u n i d e n . c o m Register the Handset to the Base If you purchase an extra handset, you need to register the handset to the base before use. Only one handset can be registered at a time. The handset ID for the supplied handset(s) was assigned at the factory, which has #1 or #2 in the display (#2 for models that have two handsets in packaging). When you register additional handset to the base, the handset ID will be assigned. 1) Before registering the extra handset, the battery pack must be charged for 15-20 hours. 2) Place the extra handset in the main base unit to begin registration. 3) While the handset is registering, Handset Registering will appear in the LCD. When Registration Complete is displayed, the handset has been registered to the base. If Registration Failed appears, please try these steps again. Extra Handset Extra Handset Charger Charger Main Base Extra Handset + Main Base Charge the handset for 15-20 hours. Place the extra handset in the main base to register. 1 2 3 4 ?An extra handset can be registered when the main base is in standby mode. ?Standby Mode - The handset is not in use and talk/flash has not been pressed.