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If you want to replace a handset or re-assign the designated handset number of a registered handset, you must de-register all the handsets and then individually register each handset.
To de-register all handsets:
Press and hold
on the telephone base for about 10
seconds (until the IN USE light on the telephone base turns on and starts to flash), then release FIND HANDSET
Press and release
FIND HANDSET again. (You must press FIND HANDSET
while the IN USE light is still flashing. The IN USE light flashes for
approximately seven seconds.)
All system handsets show
The de-registration process
takes about 10 seconds to complete. All handsets show
when the de-registration completes.
If de-registration fails, you might need to reset the telephone and try again.
Pick up the registered handset and then press
and place the handset back in the telephone base.
Unplug the power from the telephone base, then plug it back in.
You cannot de-register a handset if any system handset is in use.
After de-registering, proceed with registering process:
If the handset screen does not show LOW BATTERY
or HANDSET X, you will need to charge the handset for at least five minutes before registering to the telephone base.
To register a handset:
Place the unregistered handset in the telephone base or charger. If
PRESS FIND HS 4 SEC ON BASE
does not appear on the handset screen after a few seconds, remove the handset and place it in the telephone base or charger again.
On the telephone base, press and hold
for about four seconds (until the red IN USE light on the telephone base turns on) and then release the button. The handset shows
and it takes about 10 seconds to complete the registration. The handset shows
HANDSET X REGISTERED
(X represents the handset number assigned)
and you hear a beep when the registration completes.
The message indicator lights up when you have a new voicemail message,
answering machine message, when you are receiving a call, or when the
handset is placed on the charger. You can change the setting for the
voicemail indicator and message indicator by pressing [MENU],
[#], and press [▲] or [▼] to switch between off and on, then
select [Save]. It is not possible to turn off the LED for an incoming
call, or while it is on the charger.
The following is taken directly from the SSE37 owners' manual:
Registering a handset
If you see a "not registered" message on a handset,
you must register it to a base before using it.
On the base, open the menu and select
On the handset, press and hold #/DND
until the handset display says
Handset Registering (about 2 seconds).
Wait until the handset display says
Registration Complete (about 30 seconds),
then pick up the handset.
If you don't hear a dial tone or the display says
Registration Failed, charge the battery completely,
then try again.
When you see this 'register' message, it means that that particular DECT handset must be registred to the selected 'Base' station: please consult your User manual/guide for the steps by steps instruction on how to register a new handset to your base station for the specific compatible model(s).
1. Delete or listen to all voice mail messages, if necessary, to clear the IN USE/Voice Mail light indicator. Note: Skip this step if it does not apply to your MD Series cordless telephone model. 2. Press OFF on the base station and each handset. 3. Press and hold down PAGE on the base station until the IN USE light flashes slowly, then release. 4. Press and hold down PAGE again until the IN USE light begins to flash quickly, then release PAGE. 5. Quickly and fully press and release PAGE again. 6. Please register handset displays. Press OK to begin the registration process, or press EXIT.
You may need to "reset" the whole system. Do this by : 1 Unplug phone line, power to charger base, and remove the batteries. 2 Wait a couple of minutes. 3 Plug in batteries first, then phone line, and finally the power cord.
Then try to set the phones in the basecharger to register.
If your system was working fine, and it all of a sudden started doing this, it sounds like your base has taken a surge of some kind. Your base needs replacing. You can try re-registering the handsets, but from my experience the problem is fatal. Now if this is a new installation and the handsets never work yet on the base, you just need to register them. You can download the manuals or get tech tips at Siemens website, gigaset FAQ pages.
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.