> Not sure why I would want to self host what is effectively a phone system That's an interesting parallel. I suppose it would technically be possible for a c

> Not sure why I would want to self host what is effectively a phone system That's an interesting parallel. I suppose it would technically be possible for a company to out-source their internal phone system to an external third-party using VOIP. But I've never seen it done and I don't know how I would persuade a CTO that it's a good idea to make internal communication reliant on the Internet. Yet companies are falling over themselves to out-source internal IM... why?