MPLS VPN is a technology that allows a Service Providers such as BSNL to have complete control over parameters that are critical to offering user service guarantees with regard to bandwidth throughput, latencies and availability. 
MPLS is the technology enables secure Virtual Private Networks (VPN) to be built and allows scalability that will make it possible for BSNL to offer assured growth to its clients without having to make significant investments.
Internet Service Provider  would now be geared to provide Bandwidth on demand, Video Conferencing, Voice Over IP (VoIP) and a host of other value added services that could revolutionize the way a corporate business works. 
MPLS based VPNs reduce customer’s network complexity, costs and completely do away with the requirement of in-house technical work force, rather than setting up and managing individual point-to-point circuits between each office using pair of Leased Lines, MPLS VPN customers need to provide only one connection from their office location router to a service provider edge router.
ISP like BSNL has tied up with various Networking solution providers to provide end-to-end solution to its valued customers, including Customer End (CE) routers and other networking components.

Advantages of  MPLS VPN  over other Technologies:

Primary objectives in setting up the BGP/MPLS VPN network are:
Provide a diversified range of services (Layer 2, Layer 3 and Dial up VPNs) to meet the requirements of the entire spectrum of customers from Small and Medium to Large business enterprises and financial institutions.
Make the service very simple for customers to use even if they lack experience in IP routing. Make the service very scalable and flexible to facilitate large-scale deployment.
Provide a reliable and amenable service, offering SLA to customers Capable of meeting a wide range of customer requirements, including security, quality of Service (QOS) and any-to-any connectivity.
Capable of offering fully managed services to customers.
Allow ISP to introduce additional services such as bandwidth on demand etc. over the same network.