Asterisk - An open source telephony switching and private branch exchange service for Linux.
MyOperator - MyOperator is a cloud-based call management system for voice communication purposes.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
Servetel.in - Servetel is an Indian cloud telephony service provider. We provide services such as Toll-Free Number, Virtual Number, IVR, Bulk SMS and Voice Broadcasting.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Vibtree - Communicate on Cloud