Panasonic KX-TD500 System Reference Manual page 601

9.00 Front Call
Description
Allows the extension users to call the pre-
assigned front extension by dialing the feature
number.
Up to four front extensions are assignable for a
system. If Tenant Service is available, four front
extensions are assignable for each tenant.
Programming
System Programming
"System-Operation (3/3)",
Front Extension 1,2,3,4
"System-Numbering Plan (11/11)",
Front Call 1,2,3,4
Conditions
Front call feature number must be assigned each
front extensions.
The extension user also can call the extension
which is assigned to the front extension.
Voice Call is not available for the extension which
is assigned to the front extension.
Reference
VT Dumb
10-D-1.03 11-C-4.00
10-D-6.11 11-C-11.00
5-A-21
Operation
Calling a front extension
1. Lift the handset.
2. Dial the feature number for
"Front Call 1", "Front Call 2",
"Front Call 3", or "Front Call 4".