Mumbai Police, probing the scandal that surfaced in 2013 edition of the T20 league, recently received a forensic report which confirmed the voice samples of Meiyappan and Vindoo matched with the tapped telephonic conversation between them during IPL matches, a senior Crime Branch official said.
Meiyappan, who was Team Principal of CSK, and Vindoo were arrested in the wake of scandal and are now on bail.
Investigators have in their possession extensive transcripts of telephone conversations not only between the two but also other accused, police said.
Vindoo used to collect match-related information from Meiyappan and then shared it with bookies, they said.
In September last year, Meiyappan was chargesheeted along with Vindoo and 20 others in the IPL betting case for forgery, cheating and criminal conspiracy, four months after the scandal rocked the cricketing world.