This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The read-only sctp property on the RTCPeerConnection interface returns an RTCSctpTransport describing the SCTP transport over which SCTP data is being sent and received. If SCTP hasn't been negotiated, this value is null.

The SCTP transport is used for transmitting and receiving data for any and all RTCDataChannels on the peer connection.


var sctp = RTCPeerConnection.sctp;


A RTCSctpTransport object describing the SCTP transport being used by the RTCPeerConnection for transmitting and receiving on its data channels, or null if SCTP negotiation hasn't happened.


var pc = new RTCPeerConnection();

var channel = pc.createDataChannel("Mydata");
channel.onopen = function(event) {
Ā  channel.send('sending a message');
channel.onmessage = function(event) {
Ā  console.log(event.data);

// Determine the largest message size that can be sent

var sctp = pc.sctp;
var maxMessageSize = sctp.maxMessageSize;


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCPeerConnection.sctp' in that specification.
Candidate Recommendation Initial specification.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
sctpChrome Full support 76Edge Full support 79Firefox No support No
No support No
Notes See bug 1278299.
IE No support NoOpera No support NoSafari No support NoWebView Android Full support 76Chrome Android Full support 76Firefox Android No support No
No support No
Notes See bug 1278299.
Opera Android Full support 54Safari iOS No support NoSamsung Internet Android Full support 12.0


Full support Ā 
Full support
No support Ā 
No support
See implementation notes.
See implementation notes.

See also