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VS-900 Architects and Engineering Specifications v1.0
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3.4.1 FULL-DUPLEX
Communication between two Master Stations shall be full duplex if at least one handset is off-
hook. Communication between two Telephone Master Stations shall be full-duplex.
Communication between a Master Station and a Telephone Master Station shall be full duplex if
the Master Station handset is off-hook.
3.4.2 VOICE-OPERATED (VOX) SWITCHING (HALF-DUPLEX)
Communication between a Master Station and a Telephone Master Station shall be VOX if the
Master Station handset is on-hook. Communication between a Master Station and a Sub-station
shall be VOX if the Master Station handset is off-hook. The voice level at the Master Station shall
control the voice switching. Communication between a Telephone Master Station and a Sub-
station shall be VOX.
3.4.3 "PRESS-TO-TALK" (PTT) CONTROL
The Master Station PTT key shall be pressed to talk, and released to listen. Communication
between two Master Stations shall be PTT if both handsets are on-hook. Communication
between a Master Station and a Sub-station shall be PTT if the Master Station handset is off-
hook and PTT if the Master Station handset is on-hook.
3.5 CALLING PARTY DISPLAY
The Master Station shall display the 6-digit number or 8-character name of one of up to 64 calling
stations. When the Master Station simultaneously receives calls from two or more stations, the
station with the highest priority shall be displayed, and other waiting stations shall be displayed in
order of priority as the [REDIAL] key is pressed. The display priority shall be displayed in the
following order: Emergency Conference calls, Emergency priority Sub-station calls, Incoming
Outside Telephone Line calls, “Normal” priority Sub-station calls and Master Station or Telephone
Master Station calls.
3.6 SUB-STATION PRIORITY LEVEL
Each sub-station shall be assigned a display priority as “Normal” or "Emergency” by system
programming at the time of installation. “Emergency” sub-station calls shall appear higher in the
programmed Master Station’s Call Queue.
3.7 SELECTIVE RESPONSE/CALL QUEUE
The Selective Response/Call Queue function shall allow a Master Station receiving multiple calls
simultaneously to select and answer any desired calling party from up to 64 queued calls.
Pressing the [REDIAL] key shall advance the display to the station number or name of the second
calling party. Subsequent depressions of the [REDIAL] key will cycle the display through all
waiting station numbers or names. Lifting the handset when the desired station number (name) is
displayed shall terminate the calling tone and initiate conversation. Alternatively, the [PTT] key
may also be pressed for hands-free response.
3.8 AUTO-DIAL
Each Master Station shall support an Auto-Dial function and include eight programmable Auto-
Dial keys to allow one-touch dialing of an assigned station number or to activate functions such
as Paging, Call Forwarding or other function. Programming the Auto-Dial keys shall be possible
at the Master Station by the user.
3.9 REDIAL
The Redial function shall allow the Master Station operator to one-touch dial the last dialed
station number or system function. The Redial function shall not be available for Emergency
Paging.