Manual for Panasonic kx-tg6521R cordless with answering machine 2 handsets

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: Panasonic cordless handsets all say line in use

I had the same problem. Something makes the phone's memory get "stuck."  Take the battery out of the phone for a minute and then put it back. Then unplug the phone and plug in again. You need to do this with all extensions. The problem goes away. 

SOURCE: panasonic cordless phone #KX-TGA931T

For the speakerphone switching phone off problem, substitute the 630 mAh Ni-MH battery that comes with the phone with a better Ni-Mh battery of higher mAh such as Duracell or better yet eneloop.

Sudeep Chatterjee

• 3267 Answers
• Posted on Jun 23, 2009

SOURCE: english manual for Panasonic KX-TG1100CE cordless phone

You can downoad it from this link: http://phone.manualsonline.com/manuals/mfg/panasonic/kxtg1100ne_kxtg1102ne_kxtg1103ne.html or you can buy a copy from : http://www.cordless-phones.uk.com/cordless-phones/digital-cordless-phones/panasonic-kx-tg1100-phone
................................................sodeep