CyberData's SIP Talk-Back Speaker enables full-duplex two-way conversations in settings such as classrooms, offices, medical facilities and clinics. When used with the Remote Call Button, calls to a predetermined extension can be initiated from the room with the speaker. Alternatively, a call can be placed to the speaker to initiate either a page or two-way conversation. The SIP Talk-Back Speaker easily connects into local area networks with a single CAT5/6 cable from your PoE switch. Its small footprint allows the speaker to be mounted almost anywhere with multiple mounting options available. CyberData has maintained one of the most comprehensive lists of IP PBX servers certified to work with CyberData VoIP Products