Nextiva

Pros -  This no-contract, no-activation-fee business VoIP service is flexible to work with. It has three server locations and a fully redundant network.
 Cons -   If you need more than 10 extensions, there's an additional fee. This company doesn't give a service level agreement.
The Verdict -  7.38/10If you don't mind paying extra to have a call queue and you want a business VoIP provider that enables you to remain flexible by having no contract, this may be a good service for your company.