For roughly two years, The VAR Guy has warned Cisco Systems about the emerging open source threat to traditional IP networks. Now comes word that Voiceroute of Norwalk, Conn., is gaining momentum with a unified communications system based on open source.

The VAR Guy met Voiceroute CEO Ming Yong during OSCON (Open Source Convention) 2008 in Portland this week. Our resident blogger was impressed with a Voiceroute demo, but there’s lots more work to be done.

It sounds like Voiceroute is just starting to build its reseller channel. And the company’s current customer references are mostly small organizations rather than midsize or enterprise-class accounts.

VoiceRoute’s platform is based on Druid, described as:

Can VoiceRoute really emerge as an alternative to Cisco’s own unified communications platforms? That’s quite a stretch for the moment. But consider this: Voiceroute leverages Asterisk, the wildly popular open source IP PBX. As a result, Voiceroute should be able to leverage an established — and growing — community of open source pros.