Nextiva is a business VoIP Provider HQ in Scottsdale, Arizona. Originally established in 1996 and switched to VoIP solutions in 2005. Nextiva specializes in small business, offering Hosted PBX services with a emphasis in Unified communications.
In our Nextiva Review of the Office Pro plan we found it has a lot of advance features included, such as Advanced Call Forwarding, Call Barge-In and Unlimited Calling & Faxing. It is also good to see the Smartphone app is already well integrated, having simultaneous ring or in the most basic form call forwarding. Now if you do want to have an integration to a CRM system you'll need to move to the office enterprise plan. The included calling plan does include unlimited Canada, US and Puerto Rico.
Though for Canadian businesses perhaps the limiting factor is that Nextiva does not provide any numbers outside the US. This effectively limits the appeal of Nextiva offering in the Canadian market; while 1-800 may be acquired there'll be no way to attain local Canadian numbers, at least not from Nextiva; one would have to source it elsewhere.