The document discusses open source IP PBX systems and whether they are a niche product or disruptive technology. It notes that hundreds of thousands of businesses currently use open source telephony like Asterisk, and that major companies like Digium and Fonality offer commercial support options and certified hardware. The document argues that open source PBX systems have advanced features previously only available to large enterprises, lower pricing than legacy systems, and are easy for IT consultants to install, suggesting they are becoming a viable option for small and medium-sized businesses.