5.2.1 Setting the connector port for Door-phone ............55
5.2.2 Doorphone ringing Extensions Assignment .....56
5.2.3 Door phone call auto transfer to CO line setting ...56
5.2.4 Setting Duration of switch Signal...........................56
5.3 Operating Instruction .......................................................56
5.3.1 Door phone call & Door opener (call internal
extension) ..........................................................................56
5.3.2 Door phone call & door opener( forwarding to C.O
line) ....................................................................................57
5.3.3 Door-open directly..................................................57
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