--- title: Using DTX for Audio Optimization in Large Multi-Party Calls – WebRTC.ventures description: DTX is an advanced configuration of the Opus audio codec that allows for large reductions in on audio traffic when a participant is silent. When DTX is enabled, part of the silent audio packets won’t be transmitted. Senior WebRTC engineer, Germán Goldenstein, shares the pros and cons of this very powerful technique for audio optimization and the kind of use cases where it makes the most sense. image: https://blog.webrtc.ventures/hubfs/Imported_Blog_Media/Using-DTX-for-Audio-Optimization-1.png --- [Skip to content](https://blog.webrtc.ventures/2022/01/dtx-audio-optimization#main-content) ![WebRTC.ventures](https://blog.webrtc.ventures/hubfs/logo-main-light.svg) - [WebRTC Services](https://webrtc.ventures/webrtc-development-services/) Show submenu for WebRTC Services - [Assess](https://webrtc.ventures/services/assess/) - [Build](https://webrtc.ventures/services/build/) - [Integrate](https://webrtc.ventures/services/integrate/) - [Test](https://webrtc.ventures/services/test/) - [Manage](https://webrtc.ventures/services/manage/) - [Migrating From Twilio Video](https://webrtc.ventures/twilio-video/) - Our Partners Show submenu for Our Partners - [Amazon Chime SDK](https://webrtc.ventures/partners/amazon-chime-sdk/) - 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WebRTC Resources Show submenu for WebRTC Resources - [WebRTC Live](https://webrtc.ventures/webrtc-live/) - [WebRTC Tips](https://www.youtube.com/playlist?list=PLayYqdnyegt3QvxX-Rt6wbFIK8727Z5Oz) - [WebRTC.ventures Blog](https://webrtc.ventures/blog/) - [Migrating From Twilio Video](https://webrtc.ventures/twilio-video/) - [WebRTC.ventures Training Program](https://webrtc.ventures/webrtc-ventures-training-program/) - [About Us](https://webrtc.ventures/our-team/) Show submenu for About Us - [Blog](https://webrtc.ventures/blog/) - [Our Team](https://webrtc.ventures/our-team/) - [Jobs](https://webrtc.ventures/jobs/) - [Contact us](https://webrtc.ventures/contact/) [Contact us](https://webrtc.ventures/contact/) Jan 6, 2022 12:00:00 AM # Using DTX for Audio Optimization in Large Multi-Party Calls [Germán Goldenstein](https://blog.webrtc.ventures/author/germán-goldenstein) Share: [linkedin-in icon](http://www.linkedin.com/shareArticle?mini=true&url=https://blog.webrtc.ventures/2022/01/dtx-audio-optimization) [X Twitter icon](https://twitter.com/intent/tweet?url=https://blog.webrtc.ventures/2022/01/dtx-audio-optimization) [envelope icon](mailto:?body=https://blog.webrtc.ventures/2022/01/dtx-audio-optimization) In large, multi-party calls there are often just one or two main speakers. The rest of the participants are simply listening with their mic muted. The calls could be updates for shareholders, sales teams, vendors, regional offices, or factories – the use cases are endless. However, also are the number of empty audio packets going back and forth. This can cause a waste of audio bandwidth for silent participants. Handling low bandwidth scenarios to ensure the best user experience possible is critical in real-time applications. Discontinuous transmission can provide a solution. DTX is an advanced configuration of the [Opus audio codec](https://opus-codec.org/) that allows for a large reduction in the audio traffic. When a participant is silent, the audio packet won’t be transmitted.  ## The Pros of DTX - Saves bandwidth because less packets are sent over the network - Saves CPU usage because the receiver will be decoding less audio packets ## The Cons on DTX - Audio quality will be a bit lower than with continuous transmission, which is the default when DTX is disabled. Although the difference is not really noticeable! ## When is DTX recommended? 1. When constraints on available network bandwidth are severe 2. 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