I am new to Asterisk. What kind of businesses could be started using Asterisk? What would be the business model?

There are many many, just to name a few: hosted business PBX, FAX services, long distance services, voip residential services, hotel systems, legacy PBX bridging, wholesales VOIP and reselling, Internet cafe systems, etc. etc.

Here is a link with a ton of other ideas: … h-asterisk