Look into Call Rail. They can supply you with local numbers that can be monitored.
crazy thing......I was paying like $110 for my cell phone bill. What i ended up doing was getting a family plan for my parents....my uncle and a 2nd line for me....for real estate......keep in mind, 1 line was $110. I got a deal for 4 free phones and now the bill is only $200. My mom pays 100 of the bill for her and my dad and uncle.......and now i pay 100 for my 2 lines where i was paying 110 for 1 line previously...........check it out. that might be an option for you.