Novel?
Deep integration between a cloudy PBX, a huge softphone ecosystem spanning the majority of computing devices, the PSTN and cloudy productivity apps is novel
It isn't.
Managed Asterisk instances have been going for many years - this is commonplace stuff. I used to be a reseller, but gave it up when I realised how many customers I had to get to make any proper money.
Integration with productivity apps? The Snom series of SIP phones has full eventing for exactly that purpose. I don't know if the ones I've still got in stock are on sale any more...
Vic.