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It has to do with the electrical load that each ringer imposes on the line. Each set has a limit on how many handsets you can register with it. If you look on the bottom of the base you will see on the identification plate a data item called Ringer Equivalence Number or REN.
In telecommunication, a ringer equivalence number (REN) is a somewhat arbitrary number which denotes the electrical load a telephone ringer has on the line.
Some Panasonic cordless phones come with up to five handsets each will need to be properly adjusted. You may need to set the main handset to synchronize with the base unit plugged into the telephone wall jack and assign special configuration numbers to the other handsets in order to properly identify each one within a specified location. One handset left in the turned on mode may make it impossible to place calls with the any of the other handsets. This will continue until either the battery dies or fails on the handset or the phone is switched off and replaced in its charger for charging again. Synchronize the main handset by pressing the MENU button on the handset, then pressing the down button IN order to select the number you wish to assign to that handset. Repeating this process if you have already done so will greatly decrease the level of errors experienced with panasonic phones.
press function, initial setting, registration, deregistration, enter 335(deL) and then press Ok (right button on screen). Once that is done press mute on the base unit and Ok on the hanset (right button on sreen)
For Panasonic system (especially for KX-T7633), you have to make changes from extension 101.
1. leave handset in the cradle then press "program".
2. Dial *# then "SP-PHONE" button until you see something like time set something something
3. manually input correct date then time then press "auto dial/store" button.
4. pick up the handset then hang up to save.
IF it was a used handset it was likely registered to another base. I just switched bases (1line to a 2 line base). I had to "deregister" the handsets from the old base. I am not sure if you can deregister if the old base is not present? With the old base plugged into power I hit the "function key" at the bottom left of the handset and scrolled down to initial settings. Under registration is "deregistration". I selected that and it put the handset back to its default out of the box. Then simply hit the mute button on the New base and OK on the handset. Worked for all 5 of my old handsets.
Real easy... remove the battery and you'll see 2 screws. then start peeling the phone in half from where the screws were.. the phone may seem like its breaking but it does snap apart... then you will needs a soldering iron to replace the antenna..