Telstra's group executive of consumer and small business, Kevin Russell, has left the telco giant after just 18 months in the role and will be replaced by Vicki Brady.

The telco has not explained Mr Russell's sudden departure, although the recent annual report showed he did not receive the same bonus payments as other senior executives.

Kevin Russell is leaving Telstra after 18 months as group executive of consumer and small business. Credit:Rob Homer

"We are grateful for the contributions which Kevin Russell made during his time with Telstra and wish him all the best for the future," Telstra chief executive Andy Penn said.

Mr Russell will be replaced by Ms Brady, who has been Telstra's group managing director, consumer since mid-2016. She previously worked at Telstra's rival Optus, as managing director of marketing and products in Australia