Matrix Visionpro System Manual page 59

• Answer Supervision: It is a signal from the CO network to indicate the call maturity. Whenever you make
an outgoing call from CO trunk, the CO network will provide answer signal when the called party answers.
This feature is particularly helpful to enable accurate billing. When the signal is received, the billing will
start and in the absence of this signal, the call will not be billed, ensuring that unanswered and
unsuccessful call attempts are not billed.
Answer Supervision Signal has following two options:
• Pseudo Answer: It is used when no signaling is available from the PSTN. If this option is selected, the
call will be considered as matured on the expiry of the 'Pseudo Answer Supervision Timer'
(programmable; default 10 seconds), irrespective of whether or not the call actually gets matured. After
this, the Call Duration Timer starts. Finally, the system starts detecting the "Disconnect Supervision"
signal configured for the CO port.
Configure this option only if there is no Answer Supervision Signal supported.
• Polarity Reversal: It is used as the maturity signal when the answer signaling is given in the form of
Battery Reversal. If the battery polarity of the line is -ve for TIP and +ve for RING, when the called party
has answered the call, the CO network will reverse the battery polarity. So TIP becomes +ve and RING
-ve. After this, the Call Duration Timer is started. Finally system starts detecting the Disconnect
Supervision signal configured for the CO port.
By default, Answer Supervision is set as Pseudo Answer for each CO port.
Configure the same Answer Supervision signal as provided by your CO Network.
• Pseudo Answer Supervision Timer: Configure this timer if you have selected 'Pseudo Answer' as the
Answer Supervision Signal option.
This is the time period for which the system will wait before treating a call as matured (regardless of
whether or not it was answered). The range of this Timer is from 1 to 255 seconds. By default the Pseudo
Answer Supervision Timer is set to 10 seconds.
When Pseudo Answer is selected as the Answer Supervision signal, the call duration measured by the
system will not accurately reflect the actual call duration because the Pseudo Answer Supervision Timer is
not related to the actual call maturity. For example, if the Pseudo Answer Supervision Timer is set to 015
seconds, the call will be considered as matured after 015 seconds, even if it is answered after 20 seconds.
Similarly, if this Timer is set to 080 seconds, but the call was answered after 020 seconds and
disconnected after 040 seconds, this call will never be considered as matured as it ends before 080
seconds.
• Disconnect Supervision: It is a signal from the CO network to indicate call disconnection. Whenever a
call (incoming or outgoing) made from the CO trunk is disconnected by the remote party, the CO network
will send Disconnect signal to the CO port. VISIONPRO will detect this signal and release the CO port.
Disconnect Supervision signal is important when a PCO machine is connected to the (SLT Port)
VISIONPRO.
In such scenarios, it is desirable that calls that are disconnected by either end - calling party or called party
- is terminated by the system and the port is released. If the called (remote) party has disconnected the call
but the calling party (station that made the outgoing call from VISIONPRO) has not disconnected the call,
the call remains live within the system.
53 Matrix VISIONPRO System Manual