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1Whaleback SystemsCrystalBlue Managed Voice Services Service Launched: 2010List Price:$29.95-$69.95 per user per monthWhaleback’s focus is on managed voice services, and its cloud offering launched in 2010. Whaleback recently updated its channel partner program to give partners the ability to sell its cloud-based VoIP services to SMEs.

2Intermedia Hosted PBX Service Launched: 2010List Price: $34.95 per user per monthIntermedia’s cloud VoIP service provides businesses with unlimited local and long distance calling for a flat monthly fee. The service is SIP-enabled and also integrated with Intermedia’s hosted Exchange services.

3ThinkGrid VoIP Service Launched: 2008List Price: ?ThinkGrid sells its cloud VoIP service primarily through channel partners, and that’s one reason inside sales reps don’t like to talk price with website visitors. A free trial of its hosted VoIP service is available on its website.

4RingCentral Service Launched: 2010List Price: $19.99-$49.99 per user per monthRingCentral provides unlimited calling and faxing through its hosted VoIP services with a 30-day trial. It also offers a mobile service that integrates with mobile phones. Both affiliate and reseller programs are available.

5Fonality Service Launched: 2004List Price: Starting at $30 per user per monthFonality is the old man of this group, launching in 2004 and now offering cloud VoIP services to small offices, SMBs and enterprises. Its reseller program offers partners discounts of up to 50 percent on its services. There’s also an affiliate program.

6Synnex CloudSolv UC Service Launched: 2011List Price: Starting at $29.99 per user per monthDistributors are also getting into the game. At its Varnex conference in April, Synnex announced CloudSolv UC, a cloud service built on the Microsoft and BroadSoft technology that is available for resale by its VAR and MSP customers. Synnex is trying to make it easy for the channel to get into the cloud VoIP service market.