BYOD platform for VoIP

I need a BYOD platform for VoIP where we can make it easier, cheaper and simpler for Small businesses to connect any VoIP-enabled device and be up and running in few minutes. It must be a Zero touch platform. Clients must be able to easily signup and allocate their own calling plans, load airtime, create extensions and allocate, etc. Here are the most basic features this platform must cater for: Uncapped/Capped Calls / Easy Usage IOS & Android App Integration / Call Groups / Superb Voice Quality / Voicemail & Call Routing / Cloud Hosting / Basic or Advanced IVR / Live Chat / International Extensions / Quick & Easy Set-up / Complete Scalability & Flexibility / Video Conferencing