Panasonic KX-TD500 System Reference Manual page 1202

45.00 World Select 3 (WS3)
Description
"WS3" command provides the following 17 assignments.
(Password level: Two or higher)
(1) DIL 1: N CO Key Only (PITS only)
It is programmable that an incoming CO call routed via "DIL 1: N" feature
arrives at "CO button only" or "CO button or PDN button" as follows.
(Parameters)
Y : An incoming CO call routed via DIL 1: N feature only arrives at a PITS
telephone which has associated CO button (SCO, GCO).
If no CO button is assigned on a PITS, an incoming CO call will not
arrive at that extension.
N : An incoming CO call routed via DIL 1: N feature arrives at CO button
(SCO, GCO) or PDN button.
If no CO button is available on a PITS, an incoming CO call will arrive at
PDN button available. (default)
(2) EXT Off-hook BLF (PITS only)
Not available
(3) DTMF-Tone Integration
On extensions with the Voice Mail Port parameter enabled, 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. These codes enable the Voice Processing system to immediately
recognize the current state of the call and improve its call handling
performance.
(Parameters)
Y : The KX-TD500 system sends codes (DTMF tones) to the VPS.
N : The KX-TD500 system does not send codes (DTMF tones) to the VPS.
(default)
11-C-76