Be Your Own Phone Company.
SlashDot points out an article by George Ou that explains how, with the
help of open-source VOIP server Asterisk, you can start your own
telecommunications company for under $6000. “…You can build a phone
system that can support 72 analog telephones or fax machines, 100 IP
hard or soft phones on site or remote, a T1 line to the public telco
for 23 simultaneous external PSTN connections… [Daily Wireless]