Panasonic KX-TD500 - Manual (Page 12)

Configuration
12 Programming Guide
Parameter Status
Default —
Value Range 1. INS
2. OUS
3. FAULT
Description/Function Specifies the operating status of the trunk port.
1. INS: The trunk port is In-Service.
2. OUS: The trunk port is Out-of-Service.
3. FAULT: The trunk port is defective.
Reference None