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Video Conferencing

ConnectyCube Multiparty Video Conferencing API is built on top of WebRTC protocol and based on top of WebRTC SFU architecture.

Max people per Conference call is 12.

Video Conferencing is available starting from Advanced plan.

To get a difference between P2P calling and Conference calling please read our ConnectyCube Calling API comparison blog page.

Features supported

  • Video/Audio Conference with up to 12 people
  • Join-Rejoin video room functionality (like Skype)
  • Guest rooms
  • Mute/Unmute audio/video streams
  • Display bitrate
  • Switch video input device (camera)

Code samples

We have a ready code sample to help you better understand how to integrate multiparty video conferencing capabilities in your apps. Please contact us to request a source code.


Multiparty Video Conferencing API is based on top of regular Video Calling P2P API, so it’s good to learn its API as well.

Connect SDK

For using Video Conferencing feature you should add a dependency (only for V1):

SDK v1 kotlin

implementation "com.connectycube:connectycube-android-sdk-videochat-conference:$sdkVersion"


// Create session with Video or Audio type conference
val conferenceType = CallType.VIDEO
ConnectyCube.conferenceCalls.createSession(userId, conferenceType, object:
ConferenceCallback<ConferenceSession> {
override fun onSuccess(result: ConferenceSession) {
override fun onError(ex: WsException) {

ConferenceClient (ConferenceCalls v2) instance is a client model responsible for managing conference session.

ConferenceClient has a setAutoSubscribeAfterJoin (autoSubscribeAfterJoin v2) option, which means your client will be subscribing to all online publishers after join to some room.

ConferenceSession is a session within certain video room, managing all current processes.


In order to have an ability to receive callbacks about current ConferenceSession instance state and conference events, you should implement appropriate interfaces:

Implement RTCSessionStateCallback for tracking connection stat:

val sessionStateCallback = object: RTCSessionStateCallback<ConferenceSession> {
* Called when session state is changed
override fun onStateChanged(session: ConferenceSession, state: BaseSession.RTCSessionState) {}
* Called in case when opponent disconnected
override fun onDisconnectedFromUser(session: ConferenceSession, userId: Int) {}
* Called in case when connection with opponent is established
override fun onConnectedToUser(session: ConferenceSession, userId: Int) {}
* Called in case when connection closed with certain user.
override fun onConnectionClosedForUser(session: ConferenceSession, userId: Int) {}

Implement ConferenceSessionCallbacks for tracking conference events:

val conferenceSessionCallbacks: ConferenceSessionCallbacks<ConferenceSession> = object : ConferenceSessionCallbacks<ConferenceSession> {
* Called when some publisher (user) joined to the video room
override fun onPublishersReceived(publishers: List<Int>?) {}
* Called when some publisher left room
override fun onPublisherLeft(userId: Int?) {}
* Called when media - audio or video type, is received
override fun onMediaReceived(type: String?,
success: Boolean
) {}
* Called when slowLink is received. SlowLink with uplink=true means you notified several missing packets from server, while uplink=false means server is not receiving all your packets.
override fun onSlowLinkReceived(uplink: Boolean, lost: Int) {}
* Called when received errors from server
override fun onError(ex: WsException?) {}
* Called when ConferenceSession is closed
override fun onSessionClosed(session: ConferenceSession) {}

Video and Audio tracks

For obtaining video and audio tracks implement interface


For setting video track for ConferenceSession - the ConferenceSurfaceView (RTCSurfaceView v2) class is provided.

Join video room

You can join room as a listener or as a publisher. As listener you subscribe only to the publishers, not giving own video and audio streams.

val conferenceRole = if (asListenerRole) ConferenceRole.LISTENER else ConferenceRole.PUBLISHER
currentSession.joinDialog(dialogId, conferenceRole, object: ConferenceCallback <ArrayList<Int>> {


For subscribing to the active publisher:


!> Note: You should subscribe to publishers only when session state becomes connected. Use onStateChanged callback method to track session states.

If you are a listener, then you can subscribe to publishers right after successful joinDialog.

For unsubscribing from publisher:



To leave current room session: