Panasonic KX-TD500 System Reference Manual page 216

2.00 Tone/Pulse Conversion
Description
When the DTMF dial mode is established on a
CO line, the dial signal sent from an extension
(tone or pulse dial mode) is converted into DTMF
signals by the COT (LCOT,GCOT) card and sent
to the Central Office.
If the PULSE dial mode is established on a CO
line, the dial signal sent from an extension (tone
or pulse dial mode) is converted into pulse signal
by the COT card and sent to the Central Office.
The "DTMF dial mode" or "PULSE dial mode" is
set in "Trunk-CO Line", Dial Mode.
Set "DTMF" for a CO line which can accept both
DTMF and PULSE dialing.
Programming
System Programming
"Trunk-CO Line", Dial Mode
Reference
VT Dumb
11-C-20.00
10-F-1.00
3-C-8
Conditions
After External Feature Access, until the
maximum digits are dialed, the dialing mode is
changed to the mode set in "Trunk-CO Line", Dial
Mode.
(With a PITS, Tone Though mode is released
temporarily during this time.)
With a PITS, Tone Through mode is established
automatically after the dialing sequence.
After pressing the Tone Through Break button,
until the maximum digits are dialed, the dialing
mode becomes the dialing mode set in "Trunk-
CO Line", Dial Mode. Tone Through mode is
released temporarily during the time.
Refer to Section 4-G-12.00 "Tone Through (End
to End DTMF Signaling)" for further information.