The Silicon Valley-based company, which operates Sabsebolo -- the popular communications cloud platform for small and medium businesses -- did not disclose details of the investment.
"Ratan Tata is a visionary businessman and global thought leader, and we're delighted to have his guidance as we secure Sabse's position as a leading telecom carrier," Sabse CEO Sabeer Bhatia said.
Apart from cloud telephony, video conferencing and desktop sharing platform, Sabse has several patents in the arena of call-control and switching of calls.
Tata, who served as chairman of Tata Sons for over two decades until his retirement in 2012, has also joined some venture capital funds as advisor, including Kalaari Capital and Jungle Ventures in the past year.
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"What I look at while investing in startups is the quality and intelligence of the entrepreneurs," he had said after joining Kalaari in February this year.
Sabse president Yogesh Patel said that his expertise and insight will be "immensely helpful as Sabse expands its Wi-Fi first cellular service to consumers worldwide".