Research reveals that China is a key upcoming player in the call center industry, so it's recommend to use them as the last country of focus.
Please note that many of these companies are privately-held and/or do not have extensive websites. As such, defined details of things like KPIs, pipelines, efficiencies and more are generally not publicly available. It is possible that through client testimonials or case studies on some outbound call centers, we may be able to gather limited details, but not for all 25 of the requested top companies around the world.
Only the project owner can select the next research path.