Himanshu Roy, joint commissioner of police (crime) said the sample, which was taken on July 30, has matched the original voice. It would be a crucial piece of evidence against Jundal, who was arrested on June 21.
An officer of the Crime Branch, which is investigating the case, said the tests were conducted at the state forensic laboratory in Kalina. During the recording of the voice sample, Jundal was made to speak on phone.
"In the original intercept, the voices were on phone," the officer said. When compared in the laboratory, the pitch and the modulation of the two voices matched.
Jundal, who was originally from Maharashtra's Beed district, was involved in the terror plot since August 2008.
He had taught Hindi to the 10 terrorists who were involved in the attack. During the training, he had stayed at a dormitory at Pakistan's Murdke along with the other terrorists.