AGFEO basic-line plus AS 140 Operation And Program Manual page 40

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Operation - analog / ISDN terminals
Notes ¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢
You can also use a telephone in the hands
free mode as the guarding telephone.
You cannot use an ISDN telephone on the
internal S0 bus as a guarding telephone.
The internal phone number of the switching
box must be entered as the only internal
phone number in the call variants (ringing
distribution settings) of one multiple sub-
scriber number.
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If you hear the busy tone after dialling up
the guarding telephone, the room is already
being monitored by another caller.
Within 15 seconds you must enter the right
code number as a DTMF signal with a DTMF
hand-held transmitter or telephone as other-
wise the telephone system will clear the
connection.
When monitoring a room, please pay atten-
tion to the fact that you can also be heard in
the monitored whenever you speak.