Home Automation 70A00-1 - Manual (Page 6)

Everyday use…
When the C3 is connected to the GSM cellular network, attached
telephones can be used to make calls. If a landline is present, you
will hear the normal dial tone and you can make your call as normal
using the landline service. However, if the landline is currently
unavailable, you will hear a different tone which indicates the C3 is
in cellular mode and the call will be made using the cellular network.
If the landline is available, but you still want to make the call using
the cellular network, when you pick up the phone and hear the
normal dial tone, press the ‘*’ key on the phone and the C3 will
switch to GSM mode. At that point, you will hear the cellular mode
tone and you can make the call using the GSM cellular network.
When a call is made to the phone number assigned to the GSM
SIM card that is installed in the C3, any phones that are connected
to the C3 will ring as they normally would when a landline call is
received.
Used as Primary phone service (no landline)
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