Method of determining the speech quality in a WebRTC audio or video communication and/or collaboration session, wherein the method comprises the steps of - receiving, at a plurality of first clients (2', 2", 2′′′) used by a plurality of first participants (4', 4", 4′′′) of the audio or video communication and/or collaboration session, an audio data stream comprising speech data transmitted from a second client used by a second participant of the audio or video communication and/or collaboration session, - transmitting, at the plurality of first clients (2', 2", 2′′′), the speech data to a transcriber means (8', 8", 8′′′, 8"", 8ʺʺ′), where the speech data is transcribed into text data, and where a confidence value for the transcribed text data is estimated, the confidence value indicating a probability on the correctness of the word recognition from the speech data, and - transmitting the confidence value from the plurality of first clients (2', 2", 2′′′) to the second client so as to display the confidence value as a measure for the speech quality, wherein the confidence value is a value in the range of 0 to 1, and wherein a high confidence value indicates a good speech quality and a low confidence value indicates an impaired or poor speech quality, wherein the confidence value is determined at all clients (2', 2", 2′′′) in the WebRTC audio or video communication and/or collaboration session based on the transcription of the speech data obtained from the audio stream transmitted from the second client, and wherein for all confidence values determined at all clients (2', 2", 2′′′), a mean value is calculated, which is transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality, or wherein all confidence values determined at all clients (2', 2", 2′′′) are transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality. - receiving, at a plurality of first clients (2', 2", 2′′′) used by a plurality of first participants (4', 4", 4′′′) of the audio or video communication and/or collaboration session, an audio data stream comprising speech data transmitted from a second client used by a second participant of the audio or video communication and/or collaboration session, - transmitting, at the plurality of first clients (2', 2", 2′′′), the speech data to a transcriber means (8', 8", 8′′′, 8"", 8ʺʺ′), where the speech data is transcribed into text data, and where a confidence value for the transcribed text data is estimated, the confidence value indicating a probability on the correctness of the word recognition from the speech data, and - transmitting the confidence value from the plurality of first clients (2', 2", 2′′′) to the second client so as to display the confidence value as a measure for the speech quality, wherein the confidence value is a value in the range of 0 to 1, and wherein a high confidence value indicates a good speech quality and a low confidence value indicates an impaired or poor speech quality, wherein the confidence value is determined at all clients (2', 2", 2′′′) in the WebRTC audio or video communication and/or collaboration session based on the transcription of the speech data obtained from the audio stream transmitted from the second client, and wherein for all confidence values determined at all clients (2', 2", 2′′′), a mean value is calculated, which is transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality, or wherein all confidence values determined at all clients (2', 2", 2′′′) are transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality. wherein the confidence value is a value in the range of 0 to 1, and wherein a high confidence value indicates a good speech quality and a low confidence value indicates an impaired or poor speech quality, wherein the confidence value is determined at all clients (2', 2", 2′′′) in the WebRTC audio or video communication and/or collaboration session based on the transcription of the speech data obtained from the audio stream transmitted from the second client, and wherein for all confidence values determined at all clients (2', 2", 2′′′), a mean value is calculated, which is transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality, or wherein all confidence values determined at all clients (2', 2", 2′′′) are transmitted to the second client and displayed at the display means of the second client as a measure for the speech quality.