Dtmf Interface Operation; Intercom Mode - Raymarine Ray230 Owner's Handbook Manual

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Operations
3.5.19 DTMF Interface Operation (Optional)
A cellular fixed wireless terminal (such as the RAYCOM Fixed Cellular
Wireless Terminal) or other radio communications device with a Dual Tone
Multi-Frequency (DTMF) interface (such as some Inmarsat Mini-M's) can
be connected to the RAY230 or RAY230E, using an optional interface to
the AUX terminal.
One handset is used for DTMF phone operation while the other handset(s)
monitor(s) transmissions on the last selected working or weather channel.
The other handset(s) can only make a radio call by pressing and holding
CLR for three seconds. This terminates the phone call and gives your
handset priority over the handset making the phone call. Also, when any
DSC call is received or a distress call is transmitted, phone operation is
interrupted and radio operation is given priority. Channel 70 is always
monitored for incoming DSC calls.
Making a call
To make a phone call, remove the handset from the cradle hook and press
the FUNC key followed by the 3/CELL key. CEL appears on the 7-segment
display. Enter the telephone number to be called with the numeric keypad.
The number you just input appears on the dot matrix display. If the phone
number exceed 9 digits, the number scrolls and only the last 9 digits are
visible.
Press the ENT key to verify the number on the dot matrix display is correct.
Then press ENT again to send the call. Make your phone call as usual.
When the call is complete, hang the handset on the cradle hook or again
press FUNC followed by 3/CELL. The unit returns to normal operation.
Receiving a call
When a phone call is received, an alert tone is sounded and INCOMING
CELL CALL is indicated on the dot matrix display. To answer the call, press
the FUNC key followed by the 3/CELL key. Any handset can be used to
answer an incoming call but when the call is answered, only this handset
can be used for cellular phone operation. Other handsets can only be used
for radio signal receiving.

3.5.20 Intercom Mode

When more than one handset is installed, Intercom operation enables
talking among the stations (handsets). To start Intercom mode, press the
FUNC key followed by the 0/IC key. If only one handset is installed, the
operation is cancelled and an error alert sounds.