Once your software is communicating with the unit, connect a telephone lines and make a test call. The modular connections on the unit are designed for a 4-wire system (One phone cord carries 2 phone lines). There are two modular jacks on the unit, one jack connects 2 lines coming into the unit from the wall, the other jack connects 2 lines out to your telephone(s). If you are not extremely knowledgeable on telephone wiring please refer to Part III, “Telephone Connections” as well as Figs. 5a, 5b, 6, and 7 in the same section showing sample telephone line connections.