Off duty police respond to situations every day and I've never heard anyone being suspended for doing so.
Here's one example.
I believe you are misunderstanding my comments. I am not objecting to them responding and I certainly would not have suspended them, if I were their Boss. I was simply saying that if the suspension was because they did not advise their command that they were headed in, that is a legitimate reason for discipline. It is important for Police Officers to let their bosses know where they are at all times, especially when they are responding to a call that they are not assigned to.