Bharti Airtel and South Africa's MTN Thursday said they were extending their talks for a proposed $23-billion financial alliance till Sep 30, with no final pact in sight even as the revised deadline of Aug 31 approaches.

"Discussions between the parties regarding the potential transaction continue to progress satisfactorily and the parties have accordingly agreed to extend the exclusivity period until September 30, 2009," Bharti Airtel said in a regulatory statement to the Bombay Stock Exchange (BSE).