US President Donald Trump has been pushing for changes to the agreement.
"India is a living museum of different ethnicities and religions peacefully co-existing".
Chabahar is turning out to be a success story in the India-Iran relationship.
India and Iran signed bilateral agreements and exchanged MOUs in the presence of Iranian President Dr Hassan Rouhani and Prime Minister Narendra Modi in New Delhi on Saturday. Iran will simplify its visa norms for Indians to improve ties between the two countries, according to the reports.
Modi welcomed Rouhani at the Hyderabad House here ahead of delegation-level talks between the two sides.
India has been a key purchaser of Iranian oil and gas, and maintained trade ties even as global sanctions were imposed on Tehran over its nuclear programme between 2012 and 2016. Rouhani said that relations between the two nations were "historic" and go beyond trade and business in today's time.
India is trying to develop the port of Chabahar on Iran's east coast as a way to gain access to the markets of Central Asia as well as Afghanistan by bypassing Pakistan.
India and Iran on Saturday signed nine pacts, the most consequential of which will allow India to lease part of the strategic Chabahar port, near the mouth of the Gulf of Oman.
Iranian President Hassan Rouhani on Friday underscored that his country will simplify visa norms for India and expressed hope that "India will reciprocate this gesture". He said, Iran and India can conciliate benefits from this mutual cooperation.
The two sides also signed a document on the extradition of criminals in the consular domain and another one on juridical cooperation in civil and trade affairs.
Calling for unity among Muslims, Rouhani said his country wants to clear the "hurdles" faced by the people of war-torn countries such as Afghanistan, Syria, Iraq and Yemen are facing.
"In this context, they also called upon the countries of the region to come forward for enhancing regional connectivity and take steps to do away with the obstacles on land transit", the joint statement said.
"Relations between India and Iran are far beyond trade and diplomatic".
'First visit by an Iranian President in 10 years!
Rouhani, who arrived in the southern city of Hyderabad on Thursday, will later address industrialists.