GXP Series IP Phones – GXP1628 Product Description GXP1628 2 SIP accounts, 2 lines Dual-switched 10/100/1000 Mbps ports, integrated PoE 3-way audio conferencing See also different: Business Conferencing – GAC2500 IP PBX Solutions – UCM6300 & UCM6300A Series IP PBX Hotel IP Phones – GHP630(W) & GHP631(W) Unified Communications – GRP2610(P)