The RTCConfiguration
dictionary's iceServers
property is an array of RTCIceServer
objects, each of which describes a single STUN or TURN server to use for negotiation purposes.
Syntax
let rtcConfiguration = { iceServers: [ iceServer1... ] }; let rtcConfiguration.iceServers = [ iceServer1... ];
Value
An array of zero or more RTCIceServer
objects, each of which describes one STUN or TURN server for the ICE agent to use during the connection's negotiation. Each object must at least have an urls
property, which is an array of one or more strings, each providing one server's URL.
If the array is empty, or if the iceServers
option isn't specified, the ICE agent will negotiate without the use of any servers, which will limit the connection to local peers.
Description
How the list of servers you provide is used is up to the implementation of the user agent. While it can be useful to provide a second server as a fallback in case the first is offline, listing too many servers can delay the user's connection being established, depending on the network's performance and how many servers get used for negotiation before a connection is established.
If the list of servers is changed while a connection is already active by calling the the RTCPeerConnection
method setConfiguration()
, no immediate effect occurs. However, the new list of servers is used for any future renegotiation, such as while handling an ICE restart.
Examples
The configuration below opens a new peer connection, specifying two servers for the ICE agent to use for negotiation. The first one, stun:stun.services.mozilla.com
, requires authentication, so the username and password are provided. The second server has two URLs: stun:stun.example.com
and stun:stun-1.example.com
.
var configuration = { iceServers: [{ urls: "stun:stun.services.mozilla.com", username: "louis@mozilla.com", credential: "webrtcdemo" }, { urls: ["stun:stun.example.com", "stun:stun-1.example.com"] }] }; var pc = new RTCPeerConnection(configuration);
Specifications
Specification | Status | Comment |
---|---|---|
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCConfiguration.iceServers' in that specification. |
Candidate Recommendation | Initial definition. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
iceServers | Chrome Full support 23 | Edge Full support ≤79 | Firefox ? | IE No support No | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support 57 | Firefox Android ? | Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android Full support 7.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown