added details for call size support

Author: sloanster

articles/communication-services/concepts/voice-video-calling/calling-sdk-features.md

@@ -2,11 +2,11 @@
 title: Azure Communication Services Calling SDK overview
 titleSuffix: An Azure Communication Services concept document
 description: Provides an overview of the Calling SDK capabilities limitations features for video and audio.
-author: tophpalmer
+author: sloanster
 manager: chpalm
 services: azure-communication-services
 
-ms.author: chpalm
+ms.author: micahvivion
 ms.date: 02/24/2024
 ms.topic: conceptual
 ms.service: azure-communication-services
@@ -176,7 +176,13 @@ The Azure Communicaton Services Calling SDK support up to the following video re
 | **Receiving video** | 1080P | 1080P | 1080P   | 1080P   |
 | **Sending video**    | 720P  | 720P  | 720P    | 1080P   |
 
-The resolution can vary depending on the number of participants on a call, the amount of bandwidth available to the client, and other overall call parameters.
+The resolution can vary depending on the number of participants on a call, the amount of bandwidth available to the client, and other overall call parameters. Read 
+
+## Number of participants on a call support
+- Up to 350 users can join a group call, Room or Teams + ACS call. The maxmimum number of users that can join through WebJS calling SDK or Teams web client is capped at 100 participants, the remaining calling end point will nee to join using Android, iOS, or Windows calling SDK or related Teams desktop or mobile client apps.
+- 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.
+- When the number of people on the call is 100+, the viewable number of incoming video renders automatically decreases from 3x3 (9 incoming videos) down to 2x2 (4 incoming videos).
+- When the number of users goes below 100, the number of supported incoming videos goes back up to 3x3 (9 incoming videos).
 
 ## Calling SDK timeouts
 The following timeouts apply to the Communication Services Calling SDKs: