Panasonic KX-TD1232E, Installation Manual

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3 Features
C
Features 3-35
C
alling Party Control (CPC) Signal Detection
Description
The Calling Party Control (CPC) Signal is an on-hook indication
(disconnect signal) sent from the CO line when the telephone is
hung up at the other end. To support efficient utilization of CO
lines, the system monitors their state and when CPC Signal is
detected from a line, the system disconnects the line and informs
the extension with reorder tone.
Conditions
• CPC Signal Detection is enabled or disabled on incoming and outgoing
outside calls by system programming.
• Generally CPC Signal Detection works on incoming outside calls, and
does not work on outgoing outside calls (except once they are placed on
Call Hold, Exclusive Call Hold or Consultation Hold). In this case, if
the extension user remains off-hook after the completion of an outgoing
outside call, the system does not release all the switches used to
establish the connection, and a CO line connected will continue to be
seized. To prevent this, it is administrable to make CPC Signal
Detection work on outgoing outside calls. (Note: Some Central Offices
may send CPC-like signals during the dialling sequence and an attempt
to make a call may be terminated. If your CO does not send such
signals, it is recommended to make CPC Signal Detection work on
outgoing outside calls.)
• If your Central Office does not send CPC-like signals, it is also
effective to limit the dialled numbers during a call by the program [991]
“COS Additional Information” on a Class of Service basis to prevent
unauthorized calls.
• If CPC Signal is detected during a Conference call, the line is
disconnected and the remaining two parties maintain the call.
Programming References
Section 4, System Programming,
[405] CPC Signal Detection Incoming Set
[415] CPC Signal Detection Outgoing Set
[991] COS Additional Information, Bits 4, 3, 2, 1
Feature References
None
Operation References
Not applicable.