This depends mainly on timing. An "aborted" call is one which the caller hangs up either during or immediately following the message. By comparison, the abandoned calls are those where the caller usually gets tired of waiting and hangs up after waiting some time on hold.
A high call abandoned count usually is indicative of understaffing the call center, but can also be a result of an unplanned or unexpected event that might trigger an unusually high call volume.
You generally have to look at the entire report to get a true picture of what's going on. If your call center is a sales force, where you're really trying to answer every caller, hiring additional agents might result in better sales figures. On the other hand if it's a tech support call center, such as a cable TV company, you generally don't worry about the abandons, because if they're still having problems they'll call back.
Original MUG/NAMU Charter Member