Volvo FM Handbook page 444

3 Press YES or lift the handset
Answering a call
Press YES or lift the handset
Finishing a call
Press NO or replace the handset
Your sound system will return to the same volume as
before the call.
Making an emergency call
You can always make an emergency call, even without
the ignition key and without a SIM card. The truck's
main switch must be turned on.
1 Hold ON/OFF in until the green lamp lights
Telephone 433
J3014428
J3014428
J3014427