What is Single Number Reach?

How many phone numbers do you have? Why are people still trying to figure out whether to call your desk or your mobile phone or your home...etc. Should they not just call YOU? I asked my friend Mike Coffin to give me a run down of the technology...both from the 'what do I have to do' perspective as well as the 'what is happening behind the scenes.'

 Let me know what you think. I like the idea of chasing down user questions....let me know if there is something special you'd like to see.