[asterisk-users] Sort of OT: PBX vs CO

[Todd Adamson]

As I am working my way to understand Asterisk, I have a couple of 
questions that hopefully someone will answer.

I know there are differences between a PBX switch and a CO switch. 
Can Asterisk completely replace and act as a CO switch?  Are there any 
telecoms out there using Asterisk as a CO switch?  If so, how well 
does it work? If not, why not?