GXP Series IP Phones – GXP2135 Product Description GXP2135 4 SIP accounts, 8 lines Dual-switched 10/100/1000 Mbps ports, integrated PoE 4-way audio conferencing Integrated Bluetooth ® See also different: Intercoms & PA – GSC3516 IP PBX Solutions – SoftwareUCM DECT Cordless IP Phones – DP720/DP722/DP730 Wi-Fi Cordless IP Phones – WP856