Update call-recording.md

Incorporating video layout explanation. Explicit description of unmixed audio format.

Author: dbasantes

articles/communication-services/concepts/voice-video-calling/call-recording.md

@@ -19,26 +19,26 @@ ms.subservice: calling
 > [!NOTE]
 >  Call Recording is not enabled for [Teams interoperability](../teams-interop.md).
 
-Call Recording enables you to record multiple calling scenarios available in Azure Communication Services by providing you with a set of APIs to start, stop, pause and resume recording. Whether it's a PSTN, WebRTC, or SIP call, these APIs can be accessed from server-side business logic or via events triggered by user actions. 
+Call Recording enables you to record multiple calling scenarios available in Azure Communication Services by providing you with a set of APIs to start, stop, pause and resume recording. Whether it's a PSTN (Public Switched Telephone Network), WebRTC (Web Real-Time Communication), or SIP (Session Initiation Protocol telephony) call, these APIs can be accessed from server-side business logic or via events triggered by user actions. 
 
 Depending on your business needs, you can use Call Recording for different Azure Communication Services calling implementations.
 For example, you can record 1:1 or 1:N scenarios for audio and video calls enabled by [Calling Client SDK](https://learn.microsoft.com/azure/communication-services/concepts/voice-video-calling/calling-sdk-features). 
 
 ![Diagram showing a call that it's being recorded.](../media/call-recording-client.png)
 
 But also, you can use Call Recording to record complex PSTN or VoIP inbound and outbound calling workflows managed by [Call Automation](https://learn.microsoft.com/azure/communication-services/concepts/voice-video-calling/call-automation).
-Regardless of how you established the call, Call Recording allows you to produce mixed or unmixed media files that are stored for 48 hours on a built-in temporary storage. You can retrieve the files and take them to the long-term storage solution of your choice. Call Recording supports all Azure Communication Services data regions.
+Regardless of how you establish the call, Call Recording allows you to produce mixed or unmixed media files that are stored for 48 hours on a built-in temporary storage. You can retrieve the files and take them to the long-term storage solution of your choice. Call Recording supports all Azure Communication Services data regions.
 
 ![Diagram showing call recording architecture using calling client sdk.](../media/call-recording-with-call-automation.png)
 
 ## Call Recording that supports your business needs
-Call Recording supports multiple media outputs and content types to address your business needs and use cases. You might use mixed formats for scenarios such as keeping records, meeting notes, coaching and training, or even compliance and adherence. Or, you can use unmixed formats to address quality assurance use cases or even more complex scenarios like advanced analytics or AI-based (Artificial Intelligence) sophisticated post-call processes.
+Call Recording supports multiple media outputs and content types to address your business needs and use cases. You might use mixed formats for scenarios such as keeping records, meeting notes, coaching and training, or even compliance and adherence. Or, you can use unmixed audio format to address quality assurance use cases or even more complex scenarios like advanced analytics or AI-based (Artificial Intelligence) sophisticated post-call processes.
 
 ### Video
 
 | Channel Type | Content Format | Resolution | Sampling Rate | Output | Description |
 | :----------- | :------------- | :----------- | :---- | :--------------------------- | :------------ |
-| mixed | mp4 | 1920x1080, 16 FPS (frames per second) | 16 kHz | single file, single channel | mixed audio+video of all participants in a default tile arrangement |
+| mixed | mp4 | 1920x1080, 16 FPS (frames per second) | 16 kHz | single file, single channel | mixed video in a default 3x3 (most active speakers) tile arrangement with display name support |
 
 ### Audio
 
@@ -64,7 +64,7 @@ A `recordingId` is returned when recording is started, which is then used for fo
 
 
 ## Event Grid notifications
-Call Recording use [Azure Event Grid](https://learn.microsoft.com/azure/event-grid/event-schema-communication-services) to provide you with notifications related to media and metadata.
+Call Recording uses [Azure Event Grid](https://learn.microsoft.com/azure/event-grid/event-schema-communication-services) to provide you with notifications related to media and metadata.
 
 > [!NOTE]
 > Azure Communication Services provides short term media storage for recordings. **Recordings will be available to download for 48 hours.** After 48 hours, recordings will no longer be available.
@@ -137,7 +137,7 @@ An Event Grid notification `Microsoft.Communication.RecordingFileStatusUpdated`
 
 ## Regulatory and privacy concerns
 
-Many countries and states have laws and regulations that apply to call recording. PSTN, voice, and video calls, often require that users consent to the recording of their communications. It is your responsibility to use the call recording capabilities in compliance with the law. You must obtain consent from the parties of recorded communications in a manner that complies with the laws applicable to each participant.
+Many countries and states have laws and regulations that apply to call recording. PSTN, voice, and video calls often require that users consent to the recording of their communications. It is your responsibility to use the call recording capabilities in compliance with the law. You must obtain consent from the parties of recorded communications in a manner that complies with the laws applicable to each participant.
 
 Regulations around the maintenance of personal data require the ability to export user data. In order to support these requirements, recording metadata files include the participantId for each call participant in the `participants` array. You can cross-reference the MRIs in the `participants` array with your internal user identities to identify participants in a call.