Panasonic kx-ns500 Pc Programming Manual page 437

10.6.1 PBX Configuration—[2-6-1] System—Numbering Plan—Main
This is available only when the position of the Mode switch lever on the KX-T7710 is set to "PBX".
Value Range
Max. 32 digits (consisting of 0–9, *, #, T [Transfer], [ ] [Secret], P [Pause], and F [Flash])
PC Programming Manual 437