Capturing the silver award in IP telephony systems is Asterisk, the free, open source IP telephony application created by Digium. The application facilitates VoIP in many protocols and interoperates with almost all standards-based telephony equipment, using relatively inexpensive hardware. Asterisk can save an organization significant costs and is at the forefront of open source VoIP development.

More than three-quarters of respondents rated Asterisk's voice quality good or excellent and also gave high marks to the product's network integration and interoperability. Users were impressed by the low cost of the system and noted that its high configurability allows you to "hook just about anything into it." The system's stability and flexibility were cited as additional factors in Asterisk's silver award win.