Features
437
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
9. 6. 27. 4 Passive room monitoring
Passive room monitoring allows the destination user to listen into a room using a verifi-
cation call. To do so, he calls the monitoring phone on which room monitoring is acti-
vated. The phone automatically answers the call without any acoustic signalling and
switches the connection through. This is also the case when call forwarding has been
activated on the monitoring phone.
The check call is possible in all three monitoring modes. The connection type however
is different:
• Room monitoring in modes 1 and 3:
→ The call connection is one-way.
• Room monitoring in mode 2:
The call connection is two-way.
During the call connection
As with calls set-up by the monitoring phone in active room monitoring the user has the
possibility of switching back and forth between one-way mode (digit 1) and two-way
mode (digit 2) once the connection has been set up with DTMF suffix dialling. The
switchover is temporary.
Terminating a call connection
There is no time limit to the duration of a verification call, which must be terminated by
the user on the destination phone or by the user on the monitoring phone. Once the
call has been cleared down, the monitoring phone switches back to monitoring mode
without delay.
Calls during passive room monitoring
If another internal or external user calls the phone on which passive room monitoring is
activated (mode3), the phone signals the call visually and acoustically and the call
can be answered in the usual way.
Tip:
Passive room monitoring is indicated on the monitoring phone by the display reading Room
monitoring for ...; no exclamation mark is displayed.
Note: The same display is also shown with active room monitoring before a delay expires. This
is due to the fact that the status “active room monitoring with deactivated microphone” is equiv-
alent to passive room monitoring.
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