Panasonic DBS 576HD Technical Manual page 50

System Feature
Traffic Measurement
Trunk Groups
Trunk Name Assignment
UNA (Universal Night Answer)
Virtual Ports
Walking TRS
50 Chapter 3 - System Features
Notes
trunk (separate inbound/outbound) and intercom call traffic;
30-minute interval storing/printout via programming
inbound and outbound; up to 99 groups per system; can only
be a member of one group; MCO trunk group chaining
(available on display phones only)
incoming calls ringing over the paging system
for multiple ringing, floating park, etc.
codes for overriding TRS on a phone