What would be the best Project Management Methodology can be align working for the corporate telecommunication organization ?

It is irrelevant whether the organization in telecommunication oranything else.

Project Management Methodologies should be selected and implemented to be aligned with the corporate strategic direction of the organization.

Projects/Project Management role is to bring forward new products, services, improvements, ... etc that would ultimately contribute to the achievement of the corporate strategies and strategic long-term goals and objectives of the organization