Sigma Systems, one of the leading providers of OSS/BSS solutions globally, has appointed Santosh Honnagunti as managing director (MD) and chief operating officer (COO) in India. In his new role, Honnagunti will be responsible for the overall management of the company’s India operations. Honnagunti joins Sigma from Celcom Solutions, a Bengaluru-based services and product development organisation, where he was the CEO. He was previously head of OSS/BSS for Ericsson in the Singapore and Brunei regions. Honnagunti has also worked with Wipro, where he led large telecom projects across the US, Europe and the APAC region.