Panasonic KX-TD500 System Reference Manual page 243

2.09 Group CO (GCO)
Description
To support efficient utilization of CO lines, a
group of CO lines (trunk group) can be assigned
to a DN button on a PITS telephone.
When this function is assigned, a DN button on a
PITS serves as the Group CO (GCO) button.
GCO button feature provides better service with
a given number of CO lines.
To make an outside call, a PITS telephone user
can access an idle CO line in the group by simply
pressing the dedicated GCO button.
The following table shows the behavior of the DN
button programmed as Group CO and the CO
line status:
Indicator
Off Free CO line in trunk group and no
incoming CO call
Lights green I-use
Green 60 wink I-hold
Green 120 wink I-exclusive hold, consultation hold,
unattended conference
Green 240 wink CO Line receiving an incoming call
(except for DIL 1:N)
Lights red No idle CO lines in trunk group
and no incoming call in trunk
group
Red 60 wink —
Red 120 wink —
Red 240 wink CO line receiving an incoming call
(DIL 1:N only)
CO Line Status
3-D-25
Programming
System Programming
"Extension-Station (2/4,3/4)",
Type and Number
Conditions
• Pressing a Group CO button when it is red
serves to set the "Automatic Callback to Trunk"
function.
See Section 4-C-6.01 "Automatic Callback-
Trunk" for details.
• In the following cases, the Group CO button
indicator remains green and reorder tone is
sent.
<1> When Calling Party Control signal has
been detected during a call using the
Group CO.
<2> When outgoing restriction applies to an
outgoing call made from a Group CO.
• You cannot assign the CO line as the GCO
button which belongs to the trunk group type
"DID".
Reference
VT Dumb
10-G-1.02 11-C-26.00
10-G-1.03