GXP Series IP Phones – GXP1630 Product Description GXP16303 SIP accounts, 3 lines Dual-switched 10/100/1000 Mbps ports, integrated PoE 3-way audio conferencing See also different: DECT Cordless IP Phones – DP725 Extension Modules – GBX20 GXP Series IP Phones – GXP2140 Unified Communications – GRP2610(P)