# OPUS redundancy

**URL:** <https://mediasoup.discourse.group/t/opus-redundancy/2039>\
**Category:** mediasoup libraries\
**Created:** [November 17, 2020, 5:21pm UTC](https://mediasoup.discourse.group/t/opus-redundancy/2039 "2020-11-17T17:21:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mustafa](https://avatars.discourse-cdn.com/v4/letter/m/f19dbf/32.png) [@mustafa](https://mediasoup.discourse.group/u/mustafa)\
**Post date:** [November 17, 2020, 5:21pm UTC](https://mediasoup.discourse.group/t/opus-redundancy/2039/1 "2020-11-17T17:21:37Z")

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How to set opus redundancy codec in rtp configuration. My configuration now is  
kind : ‘audio’,  
mimeType : ‘audio/opus’,  
clockRate : 48000,  
channels : 2

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**Author:** ![nazar-pc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/nazar-pc/32/369_2.png) [@nazar-pc](https://mediasoup.discourse.group/u/nazar-pc)\
**Post date:** [November 17, 2020, 7:05pm UTC](https://mediasoup.discourse.group/t/opus-redundancy/2039/2 "2020-11-17T19:05:27Z")

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First of all OPUS has built-in FEC already.

As to RED, I do not think it is supported for audio in all browsers yet.

Here are 2 useful articles:

- [https://webrtchacks.com/red-improving-audio-quality-with-redundancy/](https://webrtchacks.com/red-improving-audio-quality-with-redundancy/)
- [https://webrtchacks.com/implementing-redundant-audio-on-an-sfu/](https://webrtchacks.com/implementing-redundant-audio-on-an-sfu/)

Looks like SFU support would be necessary for things to work properly in all cases, so that would be when an option might appear in the mediasoup-client.

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**Author:** ![mustafa](https://avatars.discourse-cdn.com/v4/letter/m/f19dbf/32.png) [@mustafa](https://mediasoup.discourse.group/u/mustafa)\
**Post date:** [November 17, 2020, 7:28pm UTC](https://mediasoup.discourse.group/t/opus-redundancy/2039/3 "2020-11-17T19:28:48Z")

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> [@nazar-pc](#):
>
> Looks like SFU support would be necessary for things to work properly in all cases, so that would be when an option might appear in the mediasoup-client.

I read the articles, thank you. You mean RED is not supported by mediasoup.

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<div class="post-metadata">

**Author:** ![nazar-pc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/nazar-pc/32/369_2.png) [@nazar-pc](https://mediasoup.discourse.group/u/nazar-pc)\
**Post date:** [November 17, 2020, 7:36pm UTC](https://mediasoup.discourse.group/t/opus-redundancy/2039/4 "2020-11-17T19:36:30Z")

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I’m not a mediasoup maintainer, but my guess would be yes.