Panasonic KX-TD500 System Reference Manual page 279

DTMF Tone Integration
The KX-TD500 system can send codes (DTMF tones) to indicate the state of the call (busy, answered,
ringing, disconnect, etc.) in addition to the normal call progress tones.
(Configuration 1)
Ext.
VPS
Hunting
Ext.
(Configuration 2)
FWD
(with Forward to
VM Sequence)
Ext.
Busy
Hunting
VPS
Hunting
Ext.
Ext.
Transfer
Hunting Hunting
VPS VPS
Hunting
Ext.
Hunting
Hunting
VPS
Hunting Hunting
DIL 1:1
DISA
DID
CO
Transfer
VPS
Hunting
VPS
Hunting
VPS
DIL 1:1
DISA
DID
CO
Transfer
VPS
VPS VPS
VPS
3-F-19
Ext.
FWD
(with Forward to
VM Sequence)
Ext.
Hunting
Hunting