Posing two questions, Maran wanted Gurumurthy, a noted columnist and auditor and the intellectual face of RSS in Tamil Nadu to answer them.
He wanted the RSS ideologue to demonstrate operation of 300 telephone lines through a single "ISDN PRI" connection.
"If he proves that such an operation is possible I will quit politics," he said in a statement here today.
"Let Gurumurthy do these two things and fix a date and time. I am ready for a debate with him," he said.
In a media interview, Gurmurthy had challenged Maran for an open debate on the telephone exchange issue.
Responding to this, Maran said he was ready for it, provided the former answered his questions.
"I am ready for a debate. Let him give explanation for these two questions. I will debate with him at a time and place fixed by him."
On January 22, Maran had accused CBI of acting under political compulsion to frame him and dared it to detain him if it had evidence.
He had questioned the January 21 arrest of three persons, including his former additional personal secretary and alleged it was an act to "please" Gurumurthy, who had 'exposed' the telephone exchange.
The 300-odd telephone line exchange was allegedly set up at Maran's house and used by the Sun TV network owned by the former minister's family for data transmission of its channel.
The agency had named Maran and BSNL officials, including the then Chief General Manager K Bramhanathan and MP Veluswami in the FIR filed in October 2013.
