The calling feature, which will work over 4G and wi-fi to begin with is available on Android currently while iOS and Windows will be followed by end of the year, the company said in a statement.
Voice calling through over-the-top (OTT) players has been a subject of debate between telecom operators and internet companies.
The Department of Telecom (DoT) in its report on net neutrality has proposed to bring voice calls offered by OTT players under its regulation, a move opposed by supporters of net neutrality.
"Now with the tap of a single button, you can connect up to 100 people in one call. It's that simple. No more pins, no more dial in numbers and no more putting people on hold. Making a group call has never been this easy," hike messenger founder and CEO Kavin Bharti Mittal said.
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Launched in December 2012, hike has over 35 million users and has raised USD 86 million from Tiger Global and BSB till date.