Panasonic KX-TD500 System Reference Manual page 316

8. Treatment of the call transferred to the busy extension/VPS by IRNA feature
The following table shows the treatment of the call transferred to the busy
extension or VPS (including all members of a Station Hunting Group are
busy.)
DID
The call continues to
arrive at the called
extension or VPS, and
it will not be
transferred to the
IRNA destination by
the IRNA feature.
3-F-56
DIL 1:1
The call is put on the waiting status, and it will
be connected to the IRNA destination as soon
as it becomes idle.
If the IRNA destination does not become idle.
A call continues to be The call will be
on the waiting status disconnected if the
until the IRNA IRNA destination
destination becomes does not become idle
idle. within 1 minute.
(In case of the IRNA
destination is an
attendant console, a
call will be
disconnected within 3
minutes.)
DISA