I worked for a company that was apparently some sort of progressive beacon about 20 years ago. They treated people well, trained them for a month before they took a live call, and even promoted people out.

There was an annual cycle (this business peaked from March-September), but many employees would return and re-qualify. We used to hire 3-4 a quarter as IT techs (out of about 300 agents), and probably about half developed into either IT professionals or went back as call center managers / escalation agents.