Ran across this software called Comet:

http://www.natara.com/Comet/index.cfm

If you make and receive, and need to track and account for, a large number of calls, this product may be worth looking at. I have no connection to the publisher, etc. In fact, I don't use it, as my call volume isn't really high enough to justify it.

So try it out and make your own decision.