I have a dxa15588-2 twin cordless phone. I have purchased from Uniden a series TCX4 expansion handset. I am having a problen registering the tcx expansion handset with my DXA 15588-2 main base. Are the two systems compatible? What is the procedure to use to make the TCX 4 operable with my original base unit? Oscar Saenz

Best to visit this page to find the manual you are after.

http://www.uniden.com/telephones/dect-60-cordless-digital-answering-system-with-caller-id-expandable-up-to-6-handsets/invt/dect1580g

http://www.uniden.com/accessory-handset+charger-for-dect1500-dect-60-cordless-phone-series/invt/dcx150g

http://phone.manualsonline.com/manuals/mfg/american_telecom/american_telecom_cordless_telephone_product_list.html

With the phone in standby, press MENU/SELECT on the base.
Move the cursor to select the Register Handset menu, and then press MENU/SELECT. Handset Registering will appear.
On the handset, press and hold # until the handset beeps and displays Handset Registering.
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.
Note: If a handset has ever been registered to a base, reset the handset before you register it to a new base

call your provider or buy new phone

If the handsets are not currently registered to any base, the SYSTEM RESET menu won't appear.

If the TCX905 handsets in question are actually expansion handsets from another Uniden Phone System, they are not true TCX905 handsets. To verify, remove the battery cover and battery, then look at the inside label. If it lists the model of a TRU9xxx phone system, your handsets are NOT TCX905.

Uniden unfortunately has programmed the expansion handsets from SINGLE LINE TRU9xxx phone systems to NOT REGISTER against the TRU9466. (Those same handsets register fine against predecessor model TRU8866 though).

I have a TRU9585 Base.

On the BASE press menu/select, scroll down to register handset using the button to the right of the display, and press select. The LED on the base will flash quickly.

Now pick up the TWX955 handset (the one that won't register), and press and hold # until it registers.

Worked for me.

You may have to manually "register" your handsets to the base. This is supposed to do it automatically but there are instructions for "registering" your handsets if the automatic feature fails or you add a new base, etc. Consult your owner manual for instructions.

we purchased the uninden 3 pack bundle they worked fine when installed now one handset will light up but the screen comes up blank and the handset won't work also if this can be corrected i would like to know how to purchase one extra hand set and charger

What is the model # of your handset. It must be tcx 900 or tcx 905 to be compatible with the tru 9488. Good luck! :)

i had to delete the caller id which was full. everything works now.