Establishing Media

Once connected to the conference as an API participant you can then escalate media. Media escalation can be audio only or a full audio/video session. This part of the call flow is more involved as it requires you to setup media devices (cameras and microphones) and also perform what is called the offer/answer dance whereby the two participants in the conversation (your application and the MCU media engine) decide what codecs to use and how best to route media to each other using ICE negotiation. It is here where you can set things like bandwidth of the call and video resolution.

If you are using PexRTC in a Cordova app, this negotiation will be handled for you but it is useful to understand what’s happening under the covers. The sections on the RTCPeerConnection are useful when building a native application using the WebRTC libraries directly (e.g. in iOS)

There are specific details on establishing media with the WebRTC libraries for iOS here and using PexRTC with Cordova here

High level call flow