Vodavi Starplus Triad-S Product Description Manual page 201

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The OHVO receiving station may press a pre-programmed Message
button to respond to the voice over announcement without being
released from the current call, (i.e. by pressing a flex button pre-
programmed for the message IN MEETING), the calling station receives
this message on the LCD display.
Option 3 -- The OHVO receiving station may respond to the calling OHVO
station by using the Camp-On feature. The OHVO receiving station
presses the flashing HOLD button to consult with the calling station. The
existing call (CO line) goes on Exclusive Hold automatically. This method
then follows Camp-On procedures and operation.
Conditions
The station receiving the OHVO call MUST be off-hook and in H mode.
The receiving station must have OHVO enabled.
When the dialed station responds via Camp-On, all conditions and
options available to Camp-On apply. (Refer to
description for more information).
OHVO may be used to notify the called party of a transferred call (CO
Line or Intercom) by announcing the call, then releasing to complete
the transfer. When this occurs, the receiving station need not respond
to the OHVO.
When a call is transferred via OHVO, the receiving station receives
muted ringing after the transfer is complete.
Any messages including Canned, Custom, or Silent Response text
messaging may be used to respond to an OHVO call. The message
appears on the calling station and called station LCD displays.
If the calling station is a non-LCD telephone, the called station
receives error tone when responding via text messaging.
The called station may press a flex button programmed as a Text
Message button, [633+#]. Press this flex button and dial the 2-digit
message number (31-51) to respond to the calling station. DTMF
digits are not heard by either party.
The receiving station must be programmed to allow OHVO calls.
When silent messaging is used to respond to an OHVO call, the
existing call on the called station is not disconnected while the
messages are being sent to the calling station.
Off-Hook Voice Over (OHVO)
Camp-On feature