Panasonic KX-TD500 System Reference Manual page 863

Note : In the following programming submenu screens, specify-
ing the screen number is available.
• Class of Service
==> Class of Service No. (01-32) =
• Trunk Group
==> Trunk Group No. (01-48) =
• CO Line
==> Trunk Equipment No. (Physical No.) =
• Station
==> Station Equipment No. (Physical No./DNxxxx) =
• DSS Console
==> Station Equipment No. (Physical No.) =
8-D-3