Days after Iran and Pakistan signed pacts to implement a long-delayed gas pipeline, India today said it has proposed trilateral talks in May to address concerns that have been impeding its joining the project.

"We have genuine issues that need to be addressed before we sign up for the (Iran-Pakistan-India) pipeline. We have proposed dates in May for technical level talks in Tehran to iron these out," Oil Secretary S Sundareshan told PTI here.

New Delhi has been boycotting project talks since 2008 after its concerns of safe delivery of gas were ignored. It wants Iran to be responsible for safe passage of gas through 1,035-km pipeline length in Pakistan and would pay for the fuel only when it is delivered at Pakistan-India border.

Iran on the other hand has suggested a trilateral mechanism, meaning contractual provisions between three countries, to ensure safe delivery of gas to India. Under this system, New Delhi pays for its share of gas even if the supplies were to be disrupted in Pakistan, officials said.

" As far as India is concerned, we are in consultation with the government of Iran. We have certain concerns. Concerns about pricing, concerns about security, which have been taken up with the government of Iran," External Affairs Minister S M Krishna said here.

According to Iran's official news agency IRNA, Tehran and Islamabad on Tuesday signed Operational Agreement and the Heads of Agreement in Turkey though it was not clear how these were different from the one that was inked during President Asif Ali Zardari's visit to Tehran in May 2009.

It was stated last year that the two sides would next sign Gas Sales and Purchase Agreement--- a pact that allows gas sale at agreed terms and without which no transaction can take place. It was not clear if this was one of the agreements that Inter-State Gas Systems, a semi-autonomous Pakistani company and National Iranian Oil Co (NIOC) signed on Tuesday.

Officials said Tehran has been insisting that ownership of gas would be transfered at Iran-Pakistan border while New Delhi wants it to be Pakistan-India border thereby making Iran explicitly responsible for safe delivery of gas.

India wants in-built safeguards in the contract to ensure safe delivery of gas at India-Pakistan border.

While the 1,100-km pipeline from South Pars gas fields in the Persian Gulf to Iran-Pakistan border would be laid by an Iranian firm, New Delhi wants to take stake in the 1,035-km pipeline section in Pakistan.

India feels that its participation in execution of pipeline in Pakistan would make the project more bankable, reduce the financing cost, ensure timely execution and ensure transparent and efficient management of the operations, they said, adding Islamabad has so far not agreed to the proposal.

Under the terms of deal signed Tuesday, Iran will supply 750 million cubic feet a day of gas to Pakistan for 25 years.

The pipeline has been on the drawing board since the mid-1990s, when Iran and India inked preliminary agreements to transport gas through Pakistan. It was dubbed the "Peace Pipeline" because of hopes it would lead to a detente between neighbours India and Pakistan.

India says it fears for safety of the pipeline in Pakistan's Baluchistan province, home to a militant Islamist separatist movement.

Officials said Iran was not willing to commit to a supply-or-pay regime wherein it would have been held accountable for non-delivery of gas at Indian border. It, however, wants New Delhi to commit to a strict take-or-pay clause wherein India would have to pay even if it does not take deliveries.

All it now says is that if Pakistan were to disrupt supplies to India, Iran will make a proportionate cut in the quantities to be delivered to Islamabad.