9
Making Calls
To make a phone call, simply pick up a connected telephone and listen for a dial tone.
Whenever a connected phone is taken off-hook, the In Use Indicator is illuminated.
If a PSTN landline is connected, you will hear the normal dial tone. Simply make your call
as normal. If the landline is temporarily unavailable, the C3 will automatically switch to GSM
mode.
If a PSTN landline is not present or is temporarily unavailable, the GSM network will be used.
You will hear a dial tone with a different cadence from the normal PSTN dial tone. When you
hear this dial tone, you know that the PSTN landline is currently unavailable and you are using
the GSM network.
When connected to a security system and an alarm occurs, the call will be made using the
GSM network as if using the PSTN landline.
Making a call using the GSM network
1) Pick up the phone and listen for the GSM dial tone.
2) Dial the phone number you wish to call and then press the ‘#’ key on the phone keypad.
The call will be made immediately.
3) When the call is connected, the Talk Indicator is illuminated.
Note: If you do not press the ‘#’ key after dialing the phone number, the call will automatically
be made several seconds after the last digit was entered.
When a landline is present
If you would like to make a phone call using the GSM network even when a PSTN landline is
available, you may do so as follows:
1) Pick up the phone and listen for the normal dial tone.
2) Press the ‘*’ key twice (i.e. * *) on the phone keypad.
3) You will immediately hear the GSM dial tone.
4) Dial the phone number you wish to call as described above.
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