Help with a project.

A company that provides counseling, education and career assistance to rural citizens countywide, found out the advantages of using VoIP. Five staff members work in the central office, which is located in the county seat and is connected to the Internet via a T1 that's shared with the county government offices. Three other staff members work from their homes in three small towns, each at least 30 miles away from the county seat. Two of the home offices connect to the Internet using DSL, and the third home office connects using broadband cable service. What seven questions would you ask the company's staff (for example, related to their business practices or current technology) to determine whether VoIP makes sense for them.
What single factor might make or break the company's entry into VoIP?