OnSIP reviews the Panasonic KX-TGP500
The Panasonic TGP500 is a DECT solution for the home or small office. It comes with one Panasonic KX-TPA50 cordless handset, but can support 6, allowing for up to 3 simultaneous calls. Each base station can also store up to to maximum of 8 different SIP registrations.
I'm not a huge fan of DECT solutions, but this one wasn't too shabby. For more details, check out my full review of the Panasonic KX-TGP500.