At least not in the location I was sitting. In fact the call routing happens off-site, but most calls require one or more call-backs with developer support. I discovered rare for a developer issue to be resolved in the true "1st contact". Like I said before, these are difficult issues and most developers willing to commit to a potential $250 phone call have already tried to use all the low hanging fruit to get answers.
I observed a lot of research, problem solving, and debugging (both customer code via live-meeting and Microsoft code to find root causes). Engineers would spend a lot of time doing research on a problem then call back customers with potential workarounds.
If you like solving a problem, and then another completely different one, and so on to the point where you get really broad exposure to technology, developer support is a cool place to be.