Hindsight is 20/20, of course, but I think one of the worst mistakes we made as an industry was grouping outbound ANI's...
They are not good as groups, or bad as groups; they're not effective as groups, or ineffective as groups, they're not "correct" in groups, or incorrect in groups - outbound phone numbers are individuals, and should have always been treated as such...
And default ANI's, well - default ANI's are the devil, when it comes to what we consider "intelligent dialing"...
outboundANI eliminates the entire concept of groups...and, consequently, it also eliminates any notion of a "default"...