Update audio-streaming-quickstart.md

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Author: valindrae

articles/communication-services/how-tos/call-automation/audio-streaming-quickstart.md

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 # Quickstart: Server-side Audio Streaming
 
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 Get started with using audio streams through Azure Communication Services Audio Streaming API. This quickstart assumes you're already familiar with Call Automation APIs to build an automated call routing solution. 
 
 Functionality described in this quickstart is currently in public preview.