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The concierge door phone can answer calls from
other door phones. The door phone will ring when
a call is received. The call is lost if no answer is
received in 30s. Two cases may occur if the door
phone answers before 30s:
1. The line is free: a conversation with the door
phone is established.
2. The line is busy: The LED flashes.
Hang up and wait for the operator to return the
call.
DS1072-021B
35