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The **`transportId`** property of the {{domxref("RTCCodecStats")}} dictionary is a string that contains the unique identifier of the corresponding transport on which this codec is being used.
You can correlate the codec and associated transport statistics by matching the `RTCCodecStats.transportId` with an {{domxref("RTCTransportStats.id")}} value.
## Value
A string that uniquely identifies a matching {{domxref("RTCTransportStats")}} object using its `id`.