Use with RingCentral cloud phone system- Use with Valcom multi-zone page control unit with FxS or analog station ports DTMF signaling only- Use with Valcom handsfree page units for talkback paging- Use with Valcom IP endpoints- Multiple units may be connected for multi-zone paging with all call behind a PABx- Background music, stereo or mono input; music mutes during page- Volume controls for background music and tones- Security code option to restrict page access- Store & Play feedback eliminator option- Multiple disconnect options- Page verification tone- Customizable Page alert tone- Drive up to 150 one-way amplified speakers on 8 Ohm output one-way output- Web interface for programming extended functions- SIP expanded to 4 extensions, with Night Ring and Store & Play on all lines- 24 Volt DC Power supply included