Web/API/RTCIceCandidatePairStats

The WebRTC RTCIceCandidatePairStats dictionary reports statistics which provide insight into the quality and performance of an RTCPeerConnection while connected and configured as described by the specified pair of ICE candidates.

If a RTCStats-based object's type is candidate-pair, it's an RTCIceCandidatePairStats object.

Properties

RTCIceCandidatePairStats is based upon RTCStats and inherits its properties. In addition, it adds the following new properties:

availableIncomingBitrate Optional: Provides an informative value representing the available inbound capacity of the network by reporting the total number of bits per second available for all of the candidate pair's incoming RTP streams. This does not take into account the size of the IP overhead, nor any other transport layers such as TCP or UDP.
availableOutgoingBitrate Optional: Provides an informative value representing the available outbound capacity of the network by reporting the total number of bits per second available for all of the candidate pair's outoing RTP streams. This does not take into account the size of the IP overhead, nor any other transport layers such as TCP or UDP.
bytesReceieved Optional: The total number of payload bytes received (that is, the total number of bytes received minus any headers, padding, or other administrative overhead) on this candidate pair so far.
bytesSent Optional: The total number of payload bytes sent (that is, the total number of bytes sent minus any headers, padding, or other administrative overhead) so far on this candidate pair.
circuitBreakerTriggerCount Optional: An integer value indicating the number of times the circuit-breaker has been triggered for this particular 5-tuple (the set of five values comprising a TCP connection: source IP address, source port number, destination IP address, destination port number, and protocol). The circuit breaker is triggered whenever a connection times out or otherwise needs to be automatically aborted.
consentExpiredTimestamp Optional: A DOMHighResTimeStamp value indicating the time at which the most recent STUN binding response expired. This value is undefined if no valid STUN binding responses have been sent on the candidate pair; this can only happen if responsesReceived is 0.
consentRequestsSent Optional: The total number of consent requests that have been sent on this candidate pair.
currentRoundTripTime Optional: A floating-point value indicating the total time, in seconds, that elapsed elapsed between the most recently-sent STUN request and the response being received. This may be based upon requests that were involved in confirming permission to open the connection.
firstRequestTimestamp Optional: A DOMHighResTimeStamp value which specifies the time at which the first STUN request was sent from the local peer to the remote peer for this candidate pair.
lastPacketReceivedTimestamp Optional: A DOMHighResTimeStamp value indicating the time at which the last packet was received by the local peer from the remote peer for this candidate pair. Timestamps are not recorded for STUN packets.
lastPacketSentTimestamp Optional: A DOMHighResTimeStamp value indicating the time at which the last packet was sent from the local peer to the remote peer for this candidate pair. Timestamps are not recorded for STUN packets.
lastRequestTimestamp Optional: A DOMHighResTimeStamp value which specifies the time at which the last (most recent) STUN request was sent from the local peer to the remote peer for this candidate pair.
lastResponseTimestamp Optional: A DOMHighResTimeStamp value that specifies the time at which the last (most recent) STUN response was received by the local candidate from the remote candidate in this pair.
localCandidateId Optional: The unique ID string corresponding to the RTCIceCandidate from the data included in the RTCIceCandidateStats object providing statistics for the candidate pair's local candidate.
nominated Optional: A Boolean value which, if true, indicates that the candidate pair described by this object is one which has been proposed for use, and will be (or was) used if its priority is the highest among the nominated candidate pairs. See RFC 5245, section 7.1.3.2.4 for details.
packetsReceived Optional: The total number of packets received on this candidate pair.
packetsSent Optional: The total number of packets sent on this candidate pair.
remoteCandidateId Optional: The unique ID string corresponding to the remote candidate from which data was taken to construct the RTCIceCandidateStats object describing the remote end of the connection.
requestsReceived Optional: The total number of connectivity check requests that have been received, including retransmissions. This value includes both connectivity checks and STUN consent checks.
requestsSent Optional: The total number of connectivity check requests that have been sent, not including retransmissions.
responsesReceived Optional: The total number of connectivity check responses that have been received.
responsesSent Optional: The total number of connectivity check responses that have been sent. This includes both connectivity check requests and STUN consent requests.
retransmissionsReceived Optional: The total number of times connectivity check request retransmissions were received. A retransmission is a connectivity check request whose TRANSACTION_TRANSMIT_COUNTER attribute's req field is greater than 1.
retransmissionsSent Optional: The total number of times connectivity check request retransmissions were sent.
state Optional: A RTCStatsIceCandidatePairState object which indicates the state of the connection between the two candidates.
totalRoundTripTime Optional: A floating-point value indicating the total time, in seconds, that has elapsed between sending STUN requests and receiving responses to them, for all such requests made to date on this candidate pair. This includes botyh connectivity check and consent check requests. You can compute the average round trip time (RTT) by dividing this value by responsesReceived.
transportId Optional: A DOMString that uniquely identifies the RTCIceTransport that was inspected to obtain the transport-related statistics (as found in RTCTransportStats) used in generating this object.

Obsolete properties

The following properties have been removed from the specification and should no longer be used. You should update any existing code to avoid using them as soon as is practical. Check the compatibility table for details on which browsers support them and in which versions.

priority ' Optional: An integer value indicating the candidate pair's priority.
readable ' Optional: A Boolean value indicating whether or not data can be sent over the connection described by the candidate pair.
writable ' Optional: A Boolean value indicating whether or not data can be received on the connection described by the candidate pair.

Non-standard properties

selected ' Optional: A Firefox-specific Boolean value which is true if the candidate pair described by this object is the one currently in use. The spec-compliant way to determine the selected candidate pair is to look for a stats object of type transport, which is an RTCTransportStats object. That object's selectedCandidatePairId property indicates whether or not the specified transport is the one being used.

Usage notes

The currently-active ICE candidate pair—if any—can be obtained by calling the RTCIceTransport method getSelectedCandidatePair(), which returns an RTCIceCandidatePair object, or null if there isn't a pair selected. The active candidate pair describes the current configuration of the two ends of the RTCPeerConnection.

Any candidate pair that isn't the active pair of candidates for a transport gets deleted if the RTCIceTransport performs an ICE restart, at which point the state of the ICE transport returns to new and negotiation starts once again. For more information, see ICE restart in Lifetime of a WebRTC session.

Example

This example computes the average time elapsed between connectivity checks if the RTCStats object rtcStats is an RTCIceCandidatePairStats object.

if (rtcStats && rtcStats.type === "candidate-pair") {
  let elapsed = (rtcStats.lastRequestTimestamp - rtcStats.firstRequestTimestamp)
                  / rtcStats.requestsSent;

  log("Average time between ICE connectivity checks: " + elapsed + " ms.");
}

The code begins by looking at rtcStats to see if its type is candidate-pair. If it is, then we know that rtcStats is in fact an RTCIceCandidatePairStats object. If so, we compute the average time elapsed between STUN connectivity checks and log that information.

Specifications

Specification	Status	Comment
Identifiers for WebRTC's Statistics APIThe definition of 'RTCIceCandidatePairStats' in that specification.	Candidate Recommendation	Initial specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`RTCIceCandidatePairStats`	Chrome Full support 56	Edge Full support ≤79	Firefox Full support 29	IE No support No	Opera ?	Safari ?	WebView Android Full support 56	Chrome Android Full support 56	Firefox Android Full support 29	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 6.0
`availableIncomingBitrate`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`availableOutgoingBitrate`	Chrome Full support Yes	Edge Full support ≤79	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`bytesReceived`	Chrome Full support Yes	Edge Full support ≤79	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`bytesSent`	Chrome Full support Yes	Edge Full support ≤79	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`circuitBreakerTriggerCount`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`consentExpiredTimestamp`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`consentRequestsSent`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`currentRoundTripTime`	Chrome Full support 71 Full support 71 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `currentRtt`	Edge Full support ≤79 Full support ≤79 Full support ≤79 Alternate Name' Alternate Name' Uses the non-standard name: `currentRtt`	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support 71 Full support 71 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `currentRtt`	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 10.0 Full support 10.0 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `currentRtt`
`firstRequestTimeStamp`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`lastPacketReceivedTimestamp`	Chrome No support No	Edge No support No	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`lastPacketSentTimestamp`	Chrome No support No	Edge No support No	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`lastReponseTimestamp`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`lastRequestTimestamp`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`localCandidateId`	Chrome No support No	Edge No support No	Firefox Full support 29	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 29	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`nominated`	Chrome No support No	Edge No support No	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`packetsReceived`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`packetsSent`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`priority` Non-standard'	Chrome No support No	Edge No support No	Firefox Full support 42 Full support 42 Full support 29 Alternate Name' Alternate Name' Uses the non-standard name: `mozPriority`	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 42 Full support 42 Full support 29 Alternate Name' Alternate Name' Uses the non-standard name: `mozPriority`	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`readable` Non-standard'	Chrome No support No	Edge No support No	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`remoteCandidateId`	Chrome No support No	Edge No support No	Firefox Full support 29	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 29	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`requestsReceived`	Chrome Full support Yes	Edge Full support ≤79	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`requestsSent`	Chrome Full support Yes	Edge Full support ≤79	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`responsesReceived`	Chrome Full support Yes	Edge Full support ≤79	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`responsesSent`	Chrome Full support Yes	Edge Full support ≤79	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes
`retransmissionsReceived`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`retransmissionsSent`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`state`	Chrome No support No	Edge No support No	Firefox Full support 29	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 29	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`totalRoundTripTime`	Chrome Full support 71 Full support 71 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `totalRtt`	Edge Full support ≤79 Full support ≤79 Full support ≤79 Alternate Name' Alternate Name' Uses the non-standard name: `totalRtt`	Firefox No support No	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android Full support 71 Full support 71 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `totalRtt`	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 10.0 Full support 10.0 Full support Yes Alternate Name' Alternate Name' Uses the non-standard name: `totalRtt`
`transportId`	Chrome No support No	Edge No support No	Firefox Full support 56 Full support 56 Full support 29 Alternate Name' Alternate Name' Uses the non-standard name: `componentId`	IE No support No	Opera ?	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 56 Full support 56 Full support 29 Alternate Name' Alternate Name' Uses the non-standard name: `componentId`	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`writable` Non-standard'	Chrome Full support Yes Notes' Full support Yes Notes' Notes' Chrome does not currently use the specification's algorithm to determine the value of `writable`; it may not match the behavior of other browsers.	Edge Full support ≤79 Notes' Full support ≤79 Notes' Notes' Edge does not currently use the specification's algorithm to determine the value of `writable`; it may not match the behavior of other browsers.	Firefox Full support 56	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes Notes' Full support Yes Notes' Notes' Chrome does not currently use the specification's algorithm to determine the value of `writable`; it may not match the behavior of other browsers.	Firefox Android Full support 56	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes Notes' Full support Yes Notes' Notes' Samsung Internet does not currently use the specification's algorithm to determine the value of `writable`; it may not match the behavior of other browsers.

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.
See implementation notes.': See implementation notes.
Uses a non-standard name.': Uses a non-standard name.

RTCIceCandidatePairStats by Mozilla Contributors is licensed under CC-BY-SA 2.5.