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5.2.2: TWA Alarm Reporting
In the event of Burglary, Fire and Medical alarms, the control system is able to report the
events and then stay on the line after ACK 2 is received. This allows the operator to
verify the alarm or provide assistance in the event of an emergency.
For this feature to function, you must enable Two-Way Audio for both the account and
the event group.
The sequence for Two-Way Audio during alarm reporting is as follows:
1. An alarm event is sent to the central station and acknowledgment is
received (ACK 2).
2. If Two-Way Audio is enabled for the account and event group, the
control system stays on the line and opens the audio channel.
3. If the TWA mode is defined as “Simplex” ( see 10.6.12: TWA Mode ),
the audio channel opens in Listen mode (microphone active/speaker
mute). The operator may switch to Speak mode, by pressing “
1 ” on
their telephone. Pressing “ 0 ” switches back to Listen mode.
4. The duration of the call is determined by the TC/VM Timeout. Ten
seconds before the timeout expires, two short DTMF tones are
sounded. To extend the call, the operator presses “
7 ” on their
telephone. This command restarts the timeout.
5. To disconnect before the end of the timeout, the operator presses “
@
”
then “ # ” on their telephone.
If multiple events are sent, the control system sends all the events before opening the
audio channel.
,
When using the SIA protocol for event reporting, this feature functions in “listen-in”
mode only.
5.2.3: Two-Way Audio after Vocal Messages
If Two-Way Audio is enabled for a Vocal Message account, the user can open the
audio channel by pressing “
2 ” on their telephone after the system has played all of
the event messages.
The sequence for Two-Way Audio after a vocal message is as follows:
1. An event occurs and the control system calls the telephone number of
VM Account 1.
2. When the user answers the call, the Home ID message and the
relevant event message are played.
3. If Two-Way Audio is enabled for the VM account, the user presses “ 2 ”
on their telephone to open the audio channel.
4. The duration of the call is determined by the TC/VM Timeout. Ten
seconds before the timeout expires, two short DTMF tones are
sounded. To extend the call, the user presses “
7 ” on their telephone.
This command restarts the timeout.
5. To disconnect before the end of the timeout, the user presses “
@
” then
“ # ” on their telephone.