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Starting Summer ’22 Release, Omni-Channel notification audio can be customised in the Presence Configuration Audio Settings Sections.
Check the following steps for adjusting the Omni-Channel notification audio.
1. Create a Static Resource with sound file with any of the following extensions.
aac, flac, mp3, ogg, opus, and wav
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2. Update the Audio Settings in the Presence Configuration.
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Video Reference: