It can be expadnable with the desket (KX-TGWA40) and the cordless handset (KX-TGWA41). Panasonic KX-TGW420 4 Line Corded Expandable Office Phone. Enjoy 30 numbers of speed dial, 6-way conferencing, 2-way recording, intercom, music on hold, digital answering system with up to 200 minutes of storage, and more.
eBay