10
Receiving Calls
When a call is made to either the landline phone number or the cellular number assigned to
the SIM card, the connected phones will ring as normal. Simply pick up a handset to answer
the call.
Ending Calls
While on a call using either the landline or the GSM network, to disconnect the call, simply
hang up the handset.
Battery Operation
The C3 unit will automatically switch from AC to battery power upon loss of AC power.
Whenever AC power is present, the rechargeable battery is being charged; the Battery
Indicator will flash.
Troubleshooting
Symptom
Problem
Always hear busy signal when the
phone is off-hook
SIM card in not installed or the SIM card is not
making a proper connection with the contacts on the
SIM card holder.
Can not connect with GSM network
• Reorient the antenna.
• Signal too weak at location.
Signal Strength Indication is weak
• Reorient the antenna.
• Antenna is connected improperly.
No dial tone
Telephone line is improperly connected.
Noise during calls
Signal too weak.
Unit unexpectedly shut down
Unit needs to be rebooted. Switch off the power and
wait a moment, then restart it.
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