Panasonic DBS-2.3-400 Programming Manual page 351

Section 400-Programming
Notes
Call Coverage Group Member Restrictions. An extension assigned as a call
coverage group member cannot also be a member of a hunt group. An
extension cannot be a member of more than one call coverage group at a time.
DSS Requirement For Positions 1 and 2. Call Coverage Group positions 1
and 2 need to have their phones' DSS/BLF keys assigned to call coverage
group members, so they can see the call flashing on the LED. (The call will
ring only once at position 1 or 2's phone.)
DBS-2.3/9.2-400 DBS Manual - Revised April 2000
Chapter 4. Ringing and Hunt Groups (FF4)
Page 4-19