hi, I wonder if somebody can help me to determine the number of lines to interconect 2 PBX at differents sites, 15 km far away. On site 1 (a new building) is supposed to be 110 persons, while on site 2 only 15 persons. But on site 2 there is a conecction, trought our private network, with diferents offices in my country (30 sites with 3 persons per site). Actually I work in an utility company and we want to by a Digital Exchange on site 1. thks