You know how annoying it is when your phone hangs up on someone and you try to call them and they try to call you and you both get busy signals and then you both decide to wait for the other person to call and then five minutes pass and by the time the conversation is back on track, you have lost momentum, not to mention a lot of time and energy? The problem could be solved forever if people would just, as a whole, adopt a uniform standard on the issue.
It is for this reason that I propose the general stipulation that whoever made the phone call in the first place should be responsible for the subsequent redialing. There is little to support this system over the alternative one; the important thing is simply that we unite behind a single standard and eliminate the confusion forever. Callers of the world, unite! and all that.