Intercoms & PA – GSC3516 Product Description GSC3516Multicast Talk-Back Speaker Full-duplex speakerphone with HD acoustic chamber, advanced acoustic echo cancellation 3 directional mics, 1 omnidirectional mic Integrated Wi-Fi and Bluetooth ® One 10/100Mbps network port with PoE/ PoE+ 2-pin multi-purpose input See also different: ATAs & Gateways – HT812 v2 – HT814 v2 HT818 v2 DECT Cordless IP Phones – DP750/DP752/DP755 GXP Series IP Phones – GXP2160 Unified Communications – GRP2603(P)