For businesses in India, Tata Tele Business Services provides a scalable and dependable small business hosted PBX service. Businesses may take use of enterprise-grade telephony services and simplified communication with this solution without the requirement for pricey on-premise infrastructure. Tata fully hosts and maintains the service, which offers hassle-free and reasonably priced communication for small enterprises.
Source: https://www.tatatelebusiness.com/cloud-solutions/smart-hosted-pbx/