Nextiva doesn't have any set-up fees or a contract. However, you also don't receive a service level agreement from this business VoIP provider that guarantees how reliable the network is. Still, with three server locations and a fully redundant network, you'll probably be okay.

If you want a flexible small business VoIP service, this may be a good option for you. Nextiva doesn't have a contract or set-up fees. It comes with unlimited minutes and faxing. Additionally, if you already have an established phone number, you can keep that number when you transfer to a VoIP. Nextiva will also give you local and toll-free numbers with your plan. One of the major drawbacks with this service is that if you need more than 10 extensions, you have to pay an additional fee for them.

As you would expect, Nextiva, like most of the business VoIP services we reviewed, has an arsenal of features in its plans. Among these features, you'll find Do Not Disturb, hold music, call acceptance and rejection, an auto attendant and call forwarding. It also has less common features such as Find-Me/Follow-Me that route incoming calls to multiple phones so that you can answer your calls whether you're at your desk or on the road. The Office Enterprise plan has Outlook integration, which allows you to easily access your contact information. In order to have a basic call queue, you must select it as an add-on. There's an additional fee associated with this service.

You can receive in-depth reports of your telephone statistics via email or by logging in to your account on the Nextiva website. The data is in list form, similar to that of a spreadsheet. It doesn't come with any graphs or charts. In order to create that kind of information, you'll need to import the data into another application.

This business VoIP has a reliable network with three server locations and a fully redundant network. According to Nextiva, it uses a proprietary network that more than 200 engineers maintain. The company says that the network is up and running 99 percent of the time; however, it doesn't provide a service level agreement to guarantee it. With the number of server locations and the redundancy in the network, however, it's unlikely you'll run into any problems.

Nextiva has U.S.-based toll-free tech support. You can also call or send an email request for someone at Nextiva to call you. If you have sales questions, this business VoIP also has a chat option. The Resources section of the website has a FAQs page, information about phones and phone numbers, a list of features and add-ons, and a link to the company's blog.