Modify the availability of a dial-out path to a specific
switched physical unit or a group of dial-out paths within a switched
major node:
>>-VARY-- --NET--,--PATH--=--+-NOUSE-+-------------------------->
'-USE---'
>--+-,--GID--=--group_id--,--ID--=--switched_major_node_name-+-><
'-,--PID--=--path_id--,--ID--=--switched_pu_name----------'