Case Study - I: Interactive Voice Response (IVR) Case Study

End Customer: BSNL, India

System Integrator (SI):

Nokia Siemens Networks (NSN)

Total End Customer Subscriber Base: 10 million


NSN was to deploy its IN to cater to 10 million subscribers in BSNL’s South Zone (comprising of 5 networks / circles of 2G & 3G complient) in India. Specialised Resource Function (SRF) is a component for which NSN opted to go with Contakt. The requirement was to deploy a high capacity SRF of 7200 ports across 5 locations.

Contakt’s Solution:

Contakt went ahead with a distributed architecture where in media ports of 48 E1s each were placed across each of the 5 networks / circles and signalling being handled centrally at one location. Some of the highlights of this solution and implementations are:
  • Ownership of recording prompts (in 6 regional languages) was taken by Contakt.
  • Handling IN Services of NSN’s SCP
  • XML based Tone Configuration
  • Flexible place holder definitions for variable parts(Price, PIN, …) for different languages
  • Tone interpreter to define a tone as a combination of multiple fragments

With our voice capabilities, same solution can be extended by deploying a voice and video gateway for other services like CRBT, MTBT BGM, Voice Portal etc.

The system architecture is as follows:

Platform Used: