The IT-BPO sector in the Philippines is the largest in the world and had eclipsed India lately.
https://www.magellan-solutions.com/blog/philippines-vs-india-which-one-is-better-in-bpo-services/
https://business.inquirer.net/3559/metro-manila-on-top-of-bpo-world-expert-says
The industry is composed of eight sub-sectors, namely, knowledge process outsourcing and back offices, animation, call centers, software development, game development, engineering design, and medical transcription.
https://en.m.wikipedia.org/wiki/Business_process_outsourcing_in_the_Philippines
While other ASEAN Nations are focused on manufacturing and agriculture, the Philippines has moved on to knowledge and skills dependent industries like the ones mentioned.
This resulted in Manila set to becoming the city with the rank of third when it comes to total office space market next to Tokyo and Beijing and eclipsing the city of Shanghai by the end of the year.