Be wary of Centrex, however, as most Centrex contracts will keep your customer locked in for a decade with heavy penalties to terminate early - at least if you are in the U.S.

Some customers also don't appreciate having to dial the additional 9 to get outside lines. You can bury one through the system on dial 9 for an outside line, but not if they are used to using direct line appearances.

Take a survey of how often they need to forward off-premises before considering the Centrex route. If it is a "must" used often, then Centrex may be a sensible solution. This is only IMHO.

"I'm the one that has to die when it's time for me to die, so let me live my life, the way I want to."
-- Jimi Hendrix