A major company with 32,000 employees in 1300 offices throughout North America recently determined there was no business case for voip. Why?
1) Long distance providers have dropped their prices to rock bottom prices
2) They wanted to have a system at each location in case the network went down. (Distributed instead of centralized)
They are piloting at new location with 100+ users but are really only looking at it on a case by case basis.

Mark Rothko