Panasonic KX-TVP50 Installation Manual page 199

Trunk 1 - Break Mode
To select the Break Mode Features for PBX outside line (trunk) group 1, follow the
menu path as shown:
System Administration Top Menu - 1 - 3 - 2 - Trunk Group No. (1) - 4
Note
The trunk group assignment procedure for Trunks 2-24 is the same as Trunk 1.
SYSTEM ADMINISTRATOR'S GUIDE
B4 SYSTEM ADMINISTRATION - PORT/TRUNK SERVICE
199