How to make a three-way conference call with Panasonic KX-TG5240?

SOURCE: Hard reset of KX-TCD580 Base

Go to this link; http://panasonic.co.uk/customer-Support/download-centre.asp and input "KXTCD580" in the search box - after a few disclaimer screens you get to the manual for your phone. page 29 details reset for the handset Page 32 details base unit reset Page 48/49 details cancelling handsets to the base Hope this helps, please post again if you are still having problems with your phone :)

SOURCE: Panasonic KX-TG2740 Cordless Phone - Can I reset handset registration

press function button on handset, scroll to initial setting, select by pressing right arrow, scroll to registration, select, select hs registration, follow directions on handset display, pressing mute on "new" base station, and ok on handset(plugged in). If you like, you can unregister with the "old" base unit first.

SOURCE: manual for panasonic kx-tg5240

Here's the manual (Adobe PDF) from Panasoni's site:

http://service.us.panasonic.com/OPERMANPDF/KXTG5240.PDF

SOURCE: adding handset to Panasonic KX-TGA542M phone. ? how to ?

I ordered a new kx-tg560m handset for my kx-tg5632 base unit, but the enclosed instructions for registering it with the base unit were wrong. Fortunately, I found the old quick setup guide in my files.

If you do not have the same base unit and handset, go to the URL:
http://www.panaxonic.com/RegisterYourHandset.

1. On the handset, press [MENU], then press [0][0]. The handset displays "Refer to manual to prepare base. Then press OK->"
2. On the base unit, press [SELECT] until the desired extension number [H1, H2, H3, or H4] is displayed on the base unit, then press and hold [CALL] until the CHARGE indicator flashes.
3. On the handset, press the [OK] softkey.

When the handset is off and sitting in the charger, the handset's extension is displayed in the upper right corner.

SOURCE: kx-tg1100

On your handset go to "SETTINGS HS" -> "REGISTRATION" -> "CANCEL BS"
This will discard the registration of the handset to any base.

Then go to "SETTINGS HS" -> "REGISTRATION" -> "REGISTER HS"and select the base you want (i.e. BASE 1, BASE 2, ..., BASE n).

After you finish all the above, hold down the "PAGE" button for about 5 secs.

You are now done!!!

Good luck
Simos