New research shows browser based Tech Support Scams are starting to utilize call optimization services. These services are used by call centers to perform call load balancing, call routing, dynamic generation of phone numbers, and more. Scammers have started to use these services to dynamically insert phone numbers into a browser-based scam page. This allows them to operate as fully operation call centers and to never miss the opportunity to scam someone out of their money. Other components of these services may also be used that provide analytics, load balancing during busy times, and rerouting calls to other numbers that have low call volume.
Source: https://www.bleepingcomputer.com/news/security/tech-support-scams-using-call-optimization-services-to-insert-phone-numbers/