Potts lines can terminate 2 ways. 1. DIL, 22-02, DIL, 22-07 DIL extension, 15-07 trunk line appearance. The call rings to the specified DIL destination extension. 2. 22-02 set to normal, 22-05 trunk is placed into a trunk ring group, 22-04 extension is placed into the same ring group as the trunk, 15-07 trunk line appearance. The Potts line come into the system and follows the trunk group to extension group setting.
DID lines follow the DID translation tables. 22-02, DID, 22-09, number of digits received from telco, 22-10 assigns the tables into those that do not follow night mode, and those that do. 22-11 incoming digits get translated to ring groups, auto attn, or a specified extension number, 15-07 trunk number or loop key.
ES: 22-09, 4 digits
22-10, 01 - 1-100, 101-199 numbers in tables 1-100 do not follow D/N, 101-199 do
22-10, 02 - 1-100, 200-299 numbers in tables 1-100 do not follow D/N, 200-299 follow night mode 2
22-11, incoming digits (1234)target number 101, 1234 rings 101, or
22-11, 1234 no target number, transfer target 1-1, transfer target 2*102. Incoming digits 1234 ring to ring group 1, if not answered ring to 102 which is a fixed setting for auto attn.
15-07, trunk line appearance or loop key appearances.
There are many more options, however this is the basic one.