Comdial 8312S System Reference Manual page 94

Sending And Receiving Non-Verbal Messages
To send an LCD message to a caller who has initiated a SOHVA
or intercom call from another LCD telephone,
1. Hear the SOHVA tone or voice announcement in your handset or
headset.
2. Press the appropriate fixed RESPONSE MESSAGE button to
send a preselected message (I Will Call Back, for example) to the
calling telephone,
—OR—
while still on the call, press the scrolling RESPONSE MESSAGE
button to scroll through the system-supplied messages.
3. Press # when your display shows the message you wish to send
(the message will then be displayed at the calling telephone and
the SOHVA call will be terminated).
8 – 6 LCD Speakerphone Reference Guide
GCA70–250