What's the best method to alert a user of an upcoming video conference?

1. What communication protocol is needed for video conferencing?
2. How to do a video conference call?
3. Is a message which is used to alert the users about some events that happening in our app?

What communication protocol is needed for video conferencing?

SIP is a network protocol for connecting client applications from different vendors. SIP has replaced H. 323 and is used in video conferencing and IP telephony.

How to do a video conference call?

Send a meeting invite with an embedded video link. Click on the link when it's time for your virtual meeting. Verify your camera and audio input. Join the conference call, share your screen and enjoy the benefit of face-to-face communication.

Is a message which is used to alert the users about some events that happening in our app?

Push notifications look like SMS text messages and mobile alerts, but they only reach users who have installed your app. All the mobile platforms – iOS, Android, Fire OS, Windows and BlackBerry – have their own services for supporting push.