Panasonic KX-TD500 System Reference Manual page 1123

A. Introduction
This section provides system programming using
Dumb type terminal. Before starting system
programming, Section 9 "Preparation for
Programming and Maintenance (Dumb Type
Terminal)" must be read. This section describes
the basic operations for programming.
Programming mode consists of 74 commands,
which enable users to assign or change various
parameters concerning the system administration
such as Tenant, Class of Service, Numbering
Plan and so on. A list of all programming
commands is provided on the following page.
11-A-1