KX-TGP550
SIP IP Expandable Cordless Phone System with Corded Handset Base Station and 1 Cordless Handset, One button Call Transfer, Ethernet Pass-through port.
KX-TGP500
SIP IP Expandable Cordless Phone System with Location-Free Base Station and 1 Cordless Handset, Handset locator button, Supports 6 TPA50s, DID Specific Ring Tones.