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Adding support for 1080P receive for web
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articles/communication-services/concepts/voice-video-calling/calling-sdk-features.md

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\* Starting from Azure Communication Services Web Calling SDK version [1.16.3](https://github.com/Azure/Communication/blob/master/releasenotes/acs-javascript-calling-library-release-notes.md#1163-stable-2023-08-24)
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While the Calling SDK does not enforce these limits, your users might experience performance degradation if they're exceeded. Use the API of [Optimal Video Count](../../how-tos/calling-sdk/manage-video.md?pivots=platform-web#remote-video-quality) to determine how many current incoming video streams your web environment can support.
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## Supported video resolutions
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The Azure Communicaton Services Calling SDK support the following video resolutions:
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| Maximum video resolution | WebJS | iOS | Android | Windows |
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| ------------- | ----- | ----- | ------- | ------- |
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| **Receiving video** | 1080P | 1080P | 1080P | 1080P |
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| **Sending video** | 720P | 720P | 720P | 1080P |
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## Calling SDK timeouts
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The following timeouts apply to the Communication Services Calling SDKs:

articles/communication-services/concepts/voice-video-calling/network-requirements.md

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|500 Kbps|Peer-to-peer quality video calling 360 pixels at 30 FPS|
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|1.2 Mbps|Peer-to-peer HD-quality video calling with resolution of HD 720 pixels at 30 FPS|
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|500 Kbps|Group video calling 360 pixels at 30 FPS|
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|1.2 Mbps|HD group video calling with resolution of HD 720 pixels at 30 FPS|
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|1.2 Mbps|HD group video calling with resolution of HD 720 pixels at 30 FPS|
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|1.5 Mbps|Peer-to-peer HD-quality video calling with resolution of HD 1080 pixels at 30 FPS |
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The following bandwidth requirements are for the native Windows, Android, and iOS SDKs.
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articles/communication-services/concepts/voice-video-calling/simulcast.md

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title: Azure Communication Services Simulcast
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titleSuffix: An Azure Communication Services concept document
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description: Overview of Simulcast - how sending multiple video quality streams helps overall call quality
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author: chriswhilar
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author: sloanster
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manager: chpalm
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services: azure-communication-services
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ms.author: chwhilar
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ms.date: 11/21/2022
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ms.author: micahvivion
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ms.date: 02/19/2024
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ms.topic: conceptual
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ms.subservice: calling
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ms.service: azure-communication-services
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---
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# What is Simulcast?
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## Available video resolutions
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When streaming with simulcast, there are no set resolutions for high or low quality simulcast video streams. Instead, based on many different variables, either a single or multiple video steams are delivered. If every subscriber to video is requesting and capable of receiving maximum resolution what publisher can provide, only that maximum resolution will be sent. The following resolutions are supported:
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- 1080P
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- 720p
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- 540p
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- 360p

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