Can anyone explain bad routes and why they can't be resolved all at once, rather than 1 number at a time?

It is to the point that every time we dial a number, we cross our fingers and hope that the number actually dials and doesn't require opening a support ticket for a "route treatment".

Some accounts require numerous, separate route treatments for various numbers. And we never really know if we got them all.

This situation erodes my confidence (and my clients' confidence) in the service.