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System & Station
Program 15 – Ground/Loop/Tie/DID Line Options
Strata DK Programming 5/99 3-45
System & Station
Program 15 Overview
This program specifies operational options on a line by line basis.
Code 0: Automatic Release (AR) on Voice Mail or Voice Calls
On loop start CO lines, some COs send the AR (Automatic Release) or CPC (Calling party
Control) signal after an external party hangs up (typically 1~15 seconds) to disconnect a loop start
line. An AR/CPC signal is a 95 or 450-millisecond open of the CO line loop. If the CO sends this
signal after an external party hangs up and before the VM/auto attendant transfers a call, D tone
will be sent to the voice mail port (Program 30, LED 15), releasing and clearing that port for
another call. This feature is active on all voice calls.
When a station is disconnected from a CO line call by the AR/CPC signal, its LCD will display
“CO LINE HANG UP”. The line can be disconnected anytime by the AR/CPC signal during the
“talk state” of a call. CO line calls disconnected by the AR/CPC signal will be represented on the
SMDR report by a “
*
” next to the CO line number. Code 0 does not apply to ground start lines,
which automatically disconnect when the external party hangs up. The Voice Mail device must
recognize the “D” tone as a disconnect signal.
Important! This option cannot always be used because some COs may send unreliable AR/CPC
signaling or no AR/CPC signaling for loop start lines.
Enable AR/CPC-Hold detect on loop start lines only after testing that the CO sends
the AR/CPC-Hold signal.
Code 1: CO Outgoing Signal
Each line can be independently assigned to have either Dial Pulse (DP) or Dual-tone Multi-
frequency (DTMF) signaling on outgoing calls toward the Central Office.
♦ If a line is set for DP operation, the 7RQH'LDO6HOHFWbutton must be programmed on
stations that must send DTMF tones over the lines.
♦ If Tie or DID lines are programmed for dial pulse, turn LED 11 ON in Program 30 for each
station port assigned to the DID or Tie line.
Code 2: Line Pulse (DP) Rate
If a line is assigned DP signaling, the rate can be either 20 or 10 pulses per second (PPS). Some
Central Offices do not reliably accept 20 PPS.
Code 3: Automatic Release (AR) From Hold/Transfer
The Automatic Release (AR) signal sometimes called Calling Party Control (CPC) or Supervised
Loop Control. This signal consists of a momentary open of the loop start CO line provided by
some COs—the duration of the open depends on the CO. If a CO line is programmed (Programs
15-0 and 15-3) to detect the AR/CPC signal, the DK system drops the line when the CO sends the
signal (typically 1~15 seconds after the outside party hangs up). The system sends D Tone to voice
mail ports to drop the ports when AR/CPC is detected.
The Strata DK system disconnects a loop start CO line voice call and displays “CO LINE HANG
UP” on the station’s LCD anytime the AR/CPC signal is detected and the CO line has Programs
15-0 and 15-3 enabled.
On loop start CO lines, some Central Offices send an AR/CPC signal. If the system CO line is on
hold (or being transferred to another station or Auto Attendant port) when the AR/CPC signal is
sent, it is automatically disconnected if this option is activated.