Identify specific business markets that typically have high
communication expenses ($1,000 to $25,000 per month) using 1+ switched
and dedicated voice and data access services, dedicated Internet,
frame relay, private line, T1, audioconferencing, calling cards and
toll-free services.

Please clearly spell out "advanced" SE methodologies that you have
used to research this question.

NOTE: I'm willing to double the ante via tip.
 
COMMENTS from experienced researchers would also be highly
appreciated.