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2.7.3. Intercoms
two intercoms for each group. Ringing from this line is characterised by being different
from the usual ringing.
The selection Number enables a DTMF number to be sent to the intercom (e.g. 00
for 2N
INTERCOM.) to open the door.
If the door communicator is not equipped with a door-opening relay, use the module
relay and select the Activate relay service for activation.
2.7.4. Switching time
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