R Systems will wage an amount of £9 million, consisting of an opening payment of £4.25 million and the balance amount on two years linked to performance, R Systems thought in a filing to the Bombay Stock Exchange (BSE).
The acquisition is funded largely from interior accruals, it added.
Computaris International is a software company engaged in the telecom sector and provides billing and real-time rating solutions.
"The acquisition of Computaris is a advance step to organise our organization along industry verticals and customer focus around type accounts and geographies," R Systems Chairman Rekhi Singh thought.
It has operations in the UK, US, Romania, Poland, Moldova, and Malaysia.