Presentation on the growing practical reality of operator-provided UCaaS propositions. Enterprises are finding it ever-harder to manage mobility & voice/video communications, given device diversity, BYOD and employee behavioural changes in using UC. Hosted options may allow greater flexibility - and also a better platform for future innovations such as app-embedded comms and WebRTC. Carriers can also blend in service value-adds such as roaming deals and WiFi access. Working with a 3rd-party UC vendor is likely to be a better bet than trying to implement UCaaS in an IMS.