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

The property RTCSessionDescription.sdp is a read-only DOMString containing the SDP which describes the session.


var value = sessionDescription.sdp;
sessionDescription.sdp = value; 


The value is a DOMString containing an SDP message like this one:

 o=alice 2890844526 2890844526 IN IP4 host.anywhere.com
 c=IN IP4 host.anywhere.com
 t=0 0
 m=audio 49170 RTP/AVP 0
 a=rtpmap:0 PCMU/8000
 m=video 51372 RTP/AVP 31
 a=rtpmap:31 H261/90000
 m=video 53000 RTP/AVP 32
 a=rtpmap:32 MPV/90000


// The remote description has been set previously on pc, an RTCPeerConnection



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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Chrome Full support YesEdge Full support 15Firefox Full support Yes
Full support Yes
Prefixed Implemented with the vendor prefix: -moz-
IE No support NoOpera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also

  • WebRTC
  • The standard for using SDP in an offer/answer protocol RFC 3264.

Document Tags and Contributors

Contributors to this page: fscholz, abbycar, Sheppy, teoli
Last updated by: fscholz,