The tripartite pipeline is a proposed 2,775km gas pipeline project to deliver natural gas from Iran to Pakistan and India. The project is expected to take three to five years to complete and would cost $7 billion.

The senior experts from the trio sit to finalize their talks in a four-day meeting in a bid to sign the contract by June, a Mehr report said..

As top officials of India and Pakistan have repeatedly announced they will not give in to the U.S. pressure, the three states are expected to reach the final agreement by June.

Due to agreement of India and Pakistan with the offered blueprint of gas price in the previous meeting, structure of the project, pipeline route, and volume of export-bound gas to India and Pakistan are the possible topics of the meeting.

Transfer cost, transit fee, and security are the issues Pakistan and India discuss in Tehran.

"Given the deadline set last Feb., the contract of peace pipeline should be finalized by the end of June," said Hojjatollah Ghanimifard, the international affairs director of National Iranian Oil Company (NIOC), adding the meeting comes into special importance in view of final agreement between the three countries.