My little MAS practice resides within an IT business and IMHO, they do live in their own world , but then, so do I. Fortunately for me, our inhouse IT group pretty much understands they are in business to server the customer. Other IT groups I have run into defintely don't see it that way.
If a phone call is important (IT or other), I like to follow the call with an email summarizing my understanding of the call which makes it more difficult for either of us to conveniently forget what was said. Sometimes, this results in additional communication.