Calling Party Control (Cpc) Signal Detection - Panasonic KX-TD816JT Features Manual

1.3 System Features

Calling Party Control (CPC) Signal Detection

Description
The Calling Party Control (CPC) Signal is an on-hook indication (disconnect signal) sent from
the outside line when the telephone is hung up at the other end. To maintain efficient utilisation
of outside lines, the system monitors their state and when CPC Signal is detected from a line,
the system disconnects the line and alerts the extension with a reorder tone.
Conditions
• CPC Signal Detection is enabled or disabled on incoming and outgoing outside calls.
<[405] CPC Signal Detection Incoming Set, [415] CPC Signal Detection Outgoing Set>
• 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. The connected outside line will continue to be in use. To prevent this, it is
programmable to make CPC Signal Detection work on outgoing outside calls. (Note: Some
Central Offices (CO) 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 effective to limit the dialled
numbers during an analogue outside call on a Class of Service basis to prevent unauthorised
calls. <[991] COS Additional Information, Bits 4, 3, 2 and 1>
• If a CPC Signal is detected during a Conference call, the line is disconnected and the
remaining two parties resume the call.
• If a CPC Signal is detected during a call between a caller using the Direct Inward System
Access (DISA) feature and an extension or an outside party, the line is disconnected.
Programming Guide References
• [405] CPC Signal Detection Incoming Set
• [415] CPC Signal Detection Outgoing Set
• [991] COS Additional Information
Features Guide References
None
User Manual References
None
20 Features Guide