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Video Calling

ConnectyCube Video Calling P2P API is built on top of WebRTC protocol and based on top of WebRTC Mesh architecture.

Max people per P2P call is 4.

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

Get started with SDK

Follow the Getting Started guide on how to connect ConnectyCube SDK and start building your first app.

Code samples

There are ready-to-go FREE code samples to help you better understand how to integrate video calling capabilities in your apps:

  • Video Chat code sample for React Native src code
  • Video Chat code sample for Cordova/PhoneGap - src code
  • Video Chat code sample for browser - src code


ConnectyCube Chat API is used as a signaling transport for Video Calling API, so in order to start using Video Calling API you need to connect user to Chat.

Create video session

In order to use Video Calling API you need to create a session object - choose your opponents with whom you will have a call and a type of session (VIDEO or AUDIO):

!> Important note: The calleesIds array must contain the opponents ids only and exclude current user id.

const calleesIds = [56, 76, 34]; // User's ids
const sessionType = ConnectyCube.videochat.CallType.VIDEO; // AUDIO is also possible
const additionalOptions = {};
const session = ConnectyCube.videochat.createNewSession(calleesIds, sessionType, additionalOptions);

!> In a case of low bandwidth network, you can try to limit the call bandwidth cap to get better quality vs stability results. It can be done by passing const additionalOptions = {bandwidth: 256}; or 128 value.

Access local media stream

In order to have a video chat session you need to get an access to the user’s devices (webcam / microphone):

const mediaParams = {
audio: true,
video: true
.then((localStream) => {})
.catch((error) => {});

This method lets the browser ask the user for permission to use devices. You should allow this dialog to access the stream. Otherwise, the browser can’t obtain access and will throw an error for getUserMedia callback function.

For more information about possible audio/video constraints, here is a good code sample from WebRTC team how to work with getUserMedia constraints:

Call quality

Limit bandwidth

Despite WebRTC engine uses automatic quality adjustement based on available Internet bandwidth, sometimes it’s better to set the max available bandwidth cap which will result in a better and smoother user experience. For example, if you know you have a bad internet connection, you can limit the max available bandwidth to e.g. 256 Kbit/s.

This can be done either when initiate a call (see below ‘Initiate a call’ API documentation):{maxBandwidth: 256}); // default is 0 - unlimited

which will result in limiting the max vailable bandwidth for ALL participants

or/and during a call:

session.setMaxBandwidth(512); // set 0 to remove the limit

which will result in limiting the max available bandwidth for current user only.

HD video quality

If HD video quality is required - the following audio/video constraints are required to pass:

{video: { width: 1280, height: 720 }, audio: true}

More info about all possible is are available here

Attach local media stream

Then you should attach your local media stream to HTML video element.

For Web-like environments, including Cordova - use the following method:

session.attachMediaStream("myVideoElementId", localStream, {
muted: true,
mirror: true,

Initiate a call

const extension = {};, (error) => {});

The extension is used to pass any extra parameters in the request to your opponents.

After this, your opponents will receive a callback call:

ConnectyCube.videochat.onCallListener = function (session, extension) {};

Or if your opponents are offline or did not answer the call request:

ConnectyCube.videochat.onUserNotAnswerListener = function (session, userId) {};

Accept a call

To accept a call the following code snippet is used:

ConnectyCube.videochat.onCallListener = function (session, extension) {
// Here we need to show a dialog with 2 buttons - Accept & Reject.
// By accepting -> run the following code:
// 1. await session.getUserMedia (...)
// 2. Accept call request:
const extension = {};

After this, your opponents will get a confirmation in the following callback:

ConnectyCube.videochat.onAcceptCallListener = function (session, userId, extension) {};

Also, both the caller and opponents will get a special callback with the remote stream:

ConnectyCube.videochat.onRemoteStreamListener = function (session, userID, remoteStream) {
// attach the remote stream to DOM element
session.attachMediaStream("remoteOpponentVideoElementId", remoteStream);

From this point, you and your opponents should start seeing each other.

Receive a call in background

For mobile apps, it can be a situation when an opponent’s user app is either in closed (killed) or background (inactive) state.

In this case, to be able to still receive a call request, you can use Push Notifications. The flow should be as follows:

  • a call initiator should send a push notification along with a call request
  • when an opponent’s app is killed or in background state - an opponent will receive a push notification about an incoming call, and will be able to accept/reject the call. If accepted or pressed on a push notification - an app will be opened, a user should auto login and connect to chat and then will be able to join an incoming call.

Please refer to Push Notifications API guides regarding how to integrate Push Notifications in your app:

For even better integration - CallKit and VoIP push notifications can be used. Please check CallKit and VoIP push notifications section on each platform Push Notifications API guide page.

Reject a call

const extension = {};

After this, the caller will get a confirmation in the following callback:

ConnectyCube.videochat.onRejectCallListener = function (session, userId, extension) {};

Sometimes, it could a situation when you received a call request and want to reject, but the call session object has not arrived yet. It could be in a case when you integrated CallKit to receive call requests while an app is in background/killed state. To do a reject in this case, the following snippet can be used:

const params = {
sessionID: callId,
recipientId: callInitiatorID,
platform: 'web'
await ConnectyCube.videochat.callRejectRequest(params);

End a call

const extension = {};

After this, the opponents will get a confirmation in the following callback:

ConnectyCube.videochat.onStopCallListener = function (session, userId, extension) {};

Monitor session connections state

There is a callback function to track the session state:

ConnectyCube.videochat.onSessionConnectionStateChangedListener = function (session, userID, connectionState) {};

The possible values of connectionState are those of an enum of type ConnectyCube.videochat.SessionConnectionState:

  • ConnectyCube.videochat.SessionConnectionState.UNDEFINED
  • ConnectyCube.videochat.SessionConnectionState.CONNECTING
  • ConnectyCube.videochat.SessionConnectionState.CONNECTED
  • ConnectyCube.videochat.SessionConnectionState.FAILED
  • ConnectyCube.videochat.SessionConnectionState.DISCONNECTED
  • ConnectyCube.videochat.SessionConnectionState.CLOSED
  • ConnectyCube.videochat.SessionConnectionState.COMPLETED

Mute audio


Mute video


Switch video cameras

First of all you need to obtain all your device’s available cameras:

let deviceInfo, deviceId, deviceLabel;
.then((devices) => {
if (devices.length) {
// here is a list of all available cameras
for (let i = 0; i !== devices.length; ++i) {
deviceInfo = devices[i];
deviceId = deviceInfo.deviceId;
deviceLabel = deviceInfo.label;
.catch((error) => {});

Then you can choose some deviceId and switch the video stream to exact this device:

const constraints = { video: deviceId };
.then((stream) => {})
.catch((error) => {});

Switch audio output

For switching audio - use the same above flow for switching camera. Just replace a videoinput to audioinput in getMediaDevices and video to audio in constraints.

Screen Sharing

Request a desktop stream by calling getDisplayMedia:

const constraints = {
video: {
width: 1280,
height: 720,
frameRate: { ideal: 10, max: 15 },
audio: true,
.then((localDesktopStream) => {})
.catch((error) => {});

More info about what else options can be passed can be found here

If the local stream already exists, the next call to getUserMedia or getDisplayMedia will update the tracks in the stream and preserve the track’s enabled state for the audio track.

Group video calls

Because of Mesh architecture we use for multipoint where every participant sends and receives its media to all other participants, current solution supports group calls with up to 4 people.

Also ConnectyCube provides an alternative solution for up to 12 people - Multiparty Video Conferencing API.


There are various calling related configs that can be changed.


The alwaysRelayCalls config sets the WebRTC RTCConfiguration.iceTransportPolicy config. Setting it to true means the calling media will be routed through TURN server all the time, and not directly P2P between users even if the network path allows it:

const appConfig = {
videochat: {
alwaysRelayCalls: true,


For the recording feature implementation you can use MediaStream Recording API

The recorder accepts a media stream and record it to file. Both local and remote streams can be recorded and saved to file.

There is also a good article about client-side recording implementation

Continue calling in background

If you are developing dedicated apps for iOS and Android - it’s required to apply additional configure for the app to continue playing calling audio when it goes into the background.

On iOS: there is no way to continue a video call in background because of some OS restrictions. What is supported there is to continue with voice calling while an app is in background. Basically, the recommended to achieve this is to switch off device camera when an app goes to background and then switch camera on back when an app goes to foreground.

Furthermore, even voice background call are blocked by default on iOS. To unblock - you need to setup proper background mode capabilities in your project. Please find the Enabling Background Audio link with more information how to do it properly. Generally speaking, you need to enable Voice over IP and Remote notifications capabilities:

Setup Xcode VOIP capabilities

For Android, we also recommend to implement the same camera switch flow when go to background and then return to foreground.