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Copy file name to clipboardExpand all lines: articles/communication-services/concepts/telephony/telephony-concept.md
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@@ -38,7 +38,9 @@ If you answer **yes** to the following questions, then Voice Calling (PSTN) is t
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With this option:
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- You get numbers directly from Microsoft and can call phones around the world.
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- You don't need to deploy or maintain any on-premises system because Voice Calling (PSTN) operates through Azure Communication Services.
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- Note: If necessary, you can choose to connect a supported Session Border Controller (SBC) through Azure Communication Services direct routing for interoperability with third-party private branch exchanges (PBXs). SBCs can also enable analog devices and other third-party telephony equipment supported by the SBC.
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> [!NOTE]
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> If necessary, you can connect a supported Session Border Controller (SBC) through Azure Communication Services direct routing for interoperability with third-party private branch exchanges (PBXs). SBCs can also enable analog devices and other third-party telephony equipment supported by the SBC.
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This option requires an uninterrupted connection to Azure Communication Services.
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- Uninterrupted connection to Azure.
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- Deploying and maintaining a supported SBC.
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- A contract with a third-party carrier. (Unless deployed as an option to provide a connection to third-party PBX, analog devices, or other telephony equipment for users who are on Communication Services.)
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- A contract with a third-party carrier. Unless deployed as an option to provide a connection to third-party PBX, analog devices, or other telephony equipment for users who are on Communication Services.
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## Next steps
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### Conceptual documentation
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-[Phone number types in Azure Communication Services](./plan-solution.md)
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-[Plan for Azure direct routing](./direct-routing-infrastructure.md)
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-[Session Border Controllers certified for Azure Communication Services direct routing](./certified-session-border-controllers.md)
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-[Pricing](../pricing.md)
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- Learn about [call automation API](../call-automation/call-automation.md) that enables you to build server-based calling workflows to control and manage calls for phone numbers and direct routing
-[Phone number types in Azure Communication Services](./plan-solution.md).
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-[Plan for Azure direct routing](./direct-routing-infrastructure.md).
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-[Session Border Controllers certified for Azure Communication Services direct routing](./certified-session-border-controllers.md).
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-[Pricing](../pricing.md).
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- Learn about [call automation API](../call-automation/call-automation.md) that enables you to build server-based calling workflows that controls and manages calls for phone numbers and direct routing.
-[Get a phone number](../../quickstarts/telephony/get-phone-number.md)
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-[Outbound call to a phone number](../../quickstarts/telephony/pstn-call.md)
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-[Use call automation to build calling workflow that can place calls to phone numbers, play voice prompts and more](../../quickstarts/call-automation/quickstart-make-an-outbound-call.md)
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-[Look up operator information for a phone number](../../quickstarts/telephony/number-lookup.md)
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-[Get a phone number](../../quickstarts/telephony/get-phone-number.md).
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-[Outbound call to a phone number](../../quickstarts/telephony/pstn-call.md).
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-[Use call automation to build calling workflow that can place calls to phone numbers, play voice prompts and more](../../quickstarts/call-automation/quickstart-make-an-outbound-call.md).
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-[Look up operator information for a phone number](../../quickstarts/telephony/number-lookup.md).
|**Maximum # of outgoing local streams that can be sent simultaneously**| 1 video and 1 screen sharing | 1 video + 1 screen sharing |
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|**Maximum # of incoming remote streams that can be rendered simultaneously**| 16 videos + 1 screen sharing on desktop browsers*, 4 videos + 1 screen sharing on web mobile browsers | 9 videos + 1 screen sharing |
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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 doesn't 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. To properly support 16 incoming videos, the computer should have a minimum of 16GB RAM and a 4-core or greater CPU that is no older than 3 years old
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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). While the Calling SDK doesn't 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 the number of incoming video streams your web environment can support. To properly support 16 incoming videos, the computer needs a minimum of 16GB RAM and a 4-core or greater CPU that is less than 3 years old.
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## Supported video resolutions
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|**Receiving a remote video stream or screen share**| 1080P | 1080P | 1080P | 1080P |
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## Number of participants on a call support
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- Up to **350** users can join a group call, Room or Teams + ACS call.
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- Once the call size reaches 100+ participants in a call, only the top 4 most dominant speakers that have their video camera turned can be seen.
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- When the number of people on the call is 100+, the viewable number of incoming video renders automatically decreases from 4x4 (16 incoming videos) down to 2x2 (4 incoming videos).
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- Up to **350** users can join a group call, Room call, or Teams + Azure Communication Services call.
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- Once the call size reaches 100+ participants, the Calling SDK only displays the top four dominant speakers that have their video camera active.
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- When the number of people on the call is 100+, the viewable number of incoming videos automatically decreases from 4x4 (16 incoming videos) down to 2x2 (4 incoming videos).
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- When the number of users goes below 100, the number of supported incoming videos goes back up to 4x4 (16 incoming videos).
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## Calling SDK timeouts
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The following timeouts apply to the Communication Services Calling SDKs:
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## Calling SDK time-outs
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The following time-outs apply to the Communication Services Calling SDKs:
| Add or remove new modality from a call (Start/stop video or screen sharing) | 40 |
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| Call Transfer operation timeout| 60 |
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| 1:1 call establishment timeout| 85 |
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| Group call establishment timeout| 85 |
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| PSTN call establishment timeout| 115 |
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| Promote 1:1 call to a group call timeout| 115 |
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| Call Transfer operation time-out| 60 |
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| 1:1 call establishment time-out| 85 |
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| Group call establishment time-out| 85 |
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| PSTN call establishment time-out| 115 |
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| Promote 1:1 call to a group call time-out| 115 |
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## Next steps
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## Related articles
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- Familiarize yourself with general [call flows](../call-flows.md)
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- Learn about [call types](../voice-video-calling/about-call-types.md)
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- Familiarize yourself with general [call flows](../call-flows.md).
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- Learn about [call types](../voice-video-calling/about-call-types.md).
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- Learn about [call automation API](../call-automation/call-automation.md) that enables you to build server-based calling workflows that can route and control calls with client applications.
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-[Plan your PSTN solution](../telephony/plan-solution.md)
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-[Plan your PSTN solution](../telephony/plan-solution.md).
Copy file name to clipboardExpand all lines: articles/communication-services/includes/survey-request.md
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---
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> [!NOTE]
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> [Complete this short survey to share your thoughts and feeback about Azure Communication Services](https://microsoft.qualtrics.com/jfe/form/SV_eCJB0lyWdLDxEp0).
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> [Complete this short survey to share your thoughts and feedback about Azure Communication Services](https://microsoft.qualtrics.com/jfe/form/SV_eCJB0lyWdLDxEp0).
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