Hi Hemant,
ITES/BPO is one of the few industries that have a whole host of HR functions that can be classified as core areas. Here are some key functions:
1. Compensation
2. Human Capital Management System
3. Benefits
4. Learning and Development
5. Staffing
6. Leadership Development
7. Communications
8. Process Excellence
9. Business Consulting
10. Employee Relations
11. Change Management
12. Performance Management
13. Diversity
14. Measuring Human and Organisational Capital
15. Retention
I have highlighted the ones that are considered to be more important, though the others are also quite important.