When {{{model|FMB640}}} is connected to a hands-free headset, it can call to user-defined GSM numbers.
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''Hands Free Call Settings'' parameter determines which event will trigger a call. {{{model|FMB640}}} supports four call trigger settings for each Digital Input it has:
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* <span style=color:#F6A83E>DIN1</span> – digital input 1 event triggers a call to user selected GSM number.
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* <span style=color:#F6A83E>DIN2</span> – digital input 2 event triggers a call to user selected GSM number.
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* <span style=color:#F6A83E>DIN3</span> – digital input 3 event triggers a call to user selected GSM number.
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* <span style=color:#F6A83E>DIN4</span> – digital input 4 event triggers a call to user selected GSM number.