As most of you know, Apple does not allow 3rd party applications to run in the background. This means if you exit RunKeeper for any reason, including answering the phone, we are required to pause. But, what you may not know is that after you answer the phone, you can immediately hit the home button, re-open RunKeeper, and resume tracking while you are talking!
In other words, RunKeeper can not run in the background, but your phone call can. I hope that is helpful!
Jason