The CMM recorded her statement at her residence here. She is a prosecution witness in the matter.
Ammal said she could not recall anything in the matter, media reports said.
"The matriarch, speaking in Tamil, said she did not recall anything," NDTV reported quoting sources.
"Dayalu Ammal also claimed she knew nothing about Kalaignar TV, the DMK's mouthpiece of which she is part owner along with her step-daughter Kanimozhi," the news channel reported quoting sources.
Rajya Sabha MP Kanimozhi and Kalaignar TV Managing Director Sharad Kumar were present at the residence during the proceedings.
In one of the biggest scams of Independent India, allegedly masterminded by former telecom minister A Raja, 2G spectrum was given away at throwaway prices in 2008 causing a potential revenue loss of up to Rs 1.76 lakh crore.
Raja, who had languished in New Delhi's Tihar jail for 15 months in connection to the scam, was released on bail last year. He was arrested in 2011.
A landmark judgement by the Supreme Court last year had quashed 122 licenses issued under the sale while a parliamentary panel was set up to study the scandal.
--IBNS (Posted on 28-10-2013)