Panasonic KX-NS1000 Pc Programming Manual page 337

9.22 PBX Configuration—[1-1] Configuration—Slot— SLC2 - Card Property
DTMF-R STD Detection Time
Specifies the minimum length that a DTMF tone must be for the PBX to recognise it as a DTMF tone.
Value Range
2 ´ n (n=1–31) ms
Maintenance Console Location
9.22 PBX Configuration—[1-1] Configuration—Slot— SLC2 - Card Property
PC Programming Manual 337