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Features 3-25
3 Features C
Calling Party Control (CPC) Signal Detection
Description The Calling Party Control (CPC) Signal is an on-hook indication
(disconnect signal) sent from the outside (CO) line when the
telephone is hung up at the other end. To maintain efficient
utilization of outside (CO) lines, the system monitors their state and
when a 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 for incoming and outgoing
outside calls by system programming.
• Generally, CPC for Signal Detection works for incoming outside calls,
and does not work for outgoing outside calls (except after they are
placed on Call Hold or Exclusive Call Hold). In this case, if an extension
user remains off-hook after an outgoing outside call is completed, the
system will not release all the switches used to establish the connection.
The connected outside (CO) line will continue to be in use. To prevent
this, CPC Signal Detection can be programmed to work for outgoing
outside calls.
• If a CPC Signal is detected during a Conference call, the line will be
disconnected and the remaining two parties can resume their call.
• If a CPC Signal is detected during a call between a DISA caller and an
extension or external party, the line will be disconnected.
Programming References
Section 4, System Programming
[420] Calling Party Control (CPC) Signal
[421] CPC Detection for Outgoing Calls
Feature References None
Operation References Not applicable.