Interview: Mark Spencer of Asterisk
"Six years ago, Mark Spencer started his own Linux technical support business. Unlike other tech startups at the time, he spent his money frugally. Spencer had to; he didn't even have enough to pay for an office PBX system, which can cost up to several thousands of dollars. 'I had about $4000 to start it out with, and I wasn't about to buy a phone system, so I figured I'd just make one,' he says."