SIP is an internet protocol for live communications used in setting up and tearing down voice or video calls. It is a signaling protocol used to create, modify, and terminate sessions with one or more participants in an IP network. A session can be a straightforward two-way phone call or it can be a multi-media conference session with many persons participating.
Connect the people to a VoipHub to make calls to any mobile or landline number.
VoipHub features: IP calls, video calls, chat between users.