Panasonic KX-TD500 System Reference Manual page 525

6.00 Unattended Conference
6.01 Unattended Conference-One
Appearance
Description
When an extension is in a conference with two
outside parties on one DN button, the extension
can leave the conference and establishes the
CO-to-CO call between other two parties by
pressing the CONF button: this is called
Unattended Conference-One Appearance.
During an unattended conference between the
two outside parties, the indicator on the DN
button flashes in 120 wink.
To execute this function, assign "System-Class of
Service", CO Transfer Mode to "Yes".
The duration of the Unattended Conference is
limited by "Group-Trunk Group", CO-CO Duration
Limit.
Programming
System Programming
"System-Class of Service (1/3)",
CO Transfer Mode
"Group-Trunk Group (1/3)",
CO-CO Duration Limit
Reference
VT Dumb
10-D-4.01 11-C-7.00
11-C-15.00
10-E-1.01
4-G-9
Conditions
If the extension is not allowed to execute this
function in Class of Service, or either or both of
the other parties are not outside ones, pressing
the CONF button during the conference is
ignored.
When the two occupied CO lines belong to
different trunk groups, the following time limits
apply to each case:
In the case one party is an outgoing CO
call, the other is an incoming CO call; The
duration limit follows to the trunk group of
the incoming CO call.
If both are outgoing CO calls or both are
incoming CO calls; The longest duration
limit assigned to one of the two trunk
groups is used.
Unattended Conference Recall starts 50 seconds
before the time limit.
30 seconds of no answer after the start of the
Unattended Conference Recall causes Intercept
Routing-No Answer.
For further details, refer to Section 3-F-5.00
"Intercept Routing-No Answer (IRNA)".
Warning tone is sent to both outside parties 15
seconds before the time limit. When CO-CO
Duration Limit applied is expired, both outside
parties are disconnected.