PRODUCT LINE: Digium distributes Asterisk Now, an open-source PBX application, offering a free version and Business Version that includes support. It also makes telephony interface cards.

PARTNER POINTS: Digium sells all the hardware solution providers need to build fully functional PBXes. It also offers a developer kit featuring a small PBX applianc. 
 

PRODUCT LINE: Fonality is a provider of IP-PBX telephone systems for small and midsize businesses.

PARTNER POINTS: The company's Business Partner Program is tailored to managed service providers and VARs looking to offer VoIP telephone service.
 

PRODUCT LINE: Junction Networks offers various hosted services for IP telephony for businesses with and without a PBX.

PARTNER POINTS: The company's program lets resellers capitalize on sales and installation fees and generate recurring revenue for the duration of the deal.