The Panasonic KX-TG6521 is a digital cordless phone that will plug into any normal BT phone line. The full specification of this phone has not yet been confirmed, but it looks like the KX-TG6521 will include a digital answering machine.
Panasonic KX-TG6521
One of the useful things with digital cordless phones is being able to add extra handsets. Usually these are sold in multi packs with the Panasonic KX-TG6521 and a number of extra phones.
Panasonic KX-TG6522
The Panasonic KX-TG6522 is a twin pack which means one main phone and one extra handset is included. The additional handset can even be in a different room to the KX-TG6521 and does not need to be plugged into the phone line.
Panasonic KX-TG6523
As the above the Panasonic KX-TG6523 is another multi pack and is a trio with two extra handsets included. Each of the phones will be able to answer calls and even transfer them between them.
Panasonic KX-TG6524
Finally the last multi pack is the Panasonic KX-TG6524 cordless phone and is a quad pack with 3 extra phones.