The MPs, clad in white kurta pyjamas, carried placards which read -- "48 hours diksha for achieving Telangana" and "Give Telangana and Save Democracy".
The five MPs are Gutha Sukhender Reddy, Manda Jagannatham, Ponnam Prabhakar, G Vivekananda and Siricilla Rajaiah.
"We are staging 48-hour satyagraha dharna here from today onwards for urging the government to fulfil the promise of Telangana State formation at an early date. It will conclude at 11 am on May 1," Ponnam Prabhakar said.
She asked the UPA government to table the Bill in Parliament on Telangana.
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"We support Telangana. Government has broken promises repeatedly. We have been telling the government to bring the bill in Parliament. But they are not doing it," Swaraj said.
Tne agitators said MPs from various political parties including JD(U) Chief Sharad Yadav, Samajwadi Party's Neeraj Shekhar and NCP's Supriya Sule met them and many of them expressed their solidarity with the cause.
Several Congress MPs and some Union ministers were also seen interacting with them.
He said it was not a hunger strike and they would continue to sit at the main gate.
Telangana Congress MPs have been vocal in raising the statehood demand, sometimes causing discomfiture to the party as it is in power in the state.
The Centre had held a meeting of major political parties from Andhra Pradesh earlier this year, but said more consultations were needed to resolve the contentious issue.