In this video, we will look into VoIP Calls in detail, explaining the messaging content and exchange process.
Skills Covered
- Protocols used for VoIP Calls
- SIP and how it works
- SDP and negotiating media exchange parameters
- Example Message flows
- SIP exchange for Extension-to-Extension calls
- SIP exchange for Extension-to-External calls
Review the full course of 3CX Phone System Training Videos at https://www.3cx.com/3cxacademy/
Additional Reading
- https://www.3cx.com/blog/voip-howto/dtmf-rfc2833/
- https://www.3cx.com/blog/voip-howto/sdp-voip/
- https://www.3cx.com/blog/voip-howto/sdp-voip2/
- SIP RFC - http://www.ietf.org/rfc/rfc3261.txt
- SDP RFC - http://www.ietf.org/rfc/rfc4566.txt
- RTP RFC - http://www.ietf.org/rfc/rfc3550.txt
Watch the previous video in this course Bridge Configuration | Watch the next video in this course Troubleshooting 3CX Phone System