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This is because the extra handset might have not been registered with the base unit.The headset should be register to use the headset with that base unit.
To register the handset to base unit please follow the instruction:-
On registration the handset is allocated a handset number for use on the new base unit, the handset numbers are 1-5.
1. Press and hold on the base unit until starts flashing. Registration mode will remain active for approximately 3 minutes. 2.Press and hold both together until you hear a long beep.
3.Select the base unit you wish to register by pressing the corresponding number button 1-4. 4. When PIN is displayed, enter the units PIN number (0000 for this model). 5. If the registration is successful the handset will return to standby mode in a few seconds. Thanx
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.
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.
Cancel the old handsets registration at the previous base unit if desired.
For additional handsets, you must register each of them at the new base unit. Only one handset can be registered at a time. A handset will be assigned anextension number at registration. Make sure the base unit and the other handsets are not being used. Program the same way as the extra handset you bought.
If you're trying to get 5 handsets to work with one base, it won't work. The 4215 can only handle 4 handsets, the base handset plus 3.
When I had to replace the base of my 4 handset system, the base handset still worked. Therefore I had an extra handset which couldn't be used. So I decided to buy another base. Now I have 6 handsets which can be grouped 4,2 or 3,3.
If you tried the registration process discribed in the book, it is possible that the base may have gotten zapped. Happened to me. Bought a new DCT 758 (cheap at Amazon.com) with only one extra handset and used two of the old handsets with it. It will only support the handset in the base and 3 others, so you can't use all of the old ones (save them for extras).
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.