The VTech VDP651 is a ErisTerminal SIP Feature Handset that handles up to 4 SIP lines / accounts and manages multiple calls with advanced call handling features. The phone can be Programmed up to 7 Dedicated Feature Keys for convenient access. The VDP651 is a full-duplex speakerphone with HD voice quality makes the experience more true to life. The phone features 3-way conferencing and multi line support.