Update room-concept.md to reflect that CA PSTN dialout is now in GA

Adding one line note that PSTN participant doesn't carry a user role and removing the public preview labels

Author: FarrukhGhaffar

articles/communication-services/concepts/rooms/room-concept.md

@@ -26,16 +26,14 @@ Virtual Rooms empower developers with essential security and control capabilitie
 | Voice (VoIP) | ✔️ |
 | Video | ✔️ |
 | Client initiated dial-out to a PSTN number | ✔️ |
-| Server initiated dial-out to a PSTN number** | ✔️ |
+| Server initiated dial-out to a PSTN number | ✔️ |
 | Server-side call management (Call Automation)*  | ✔️ |
 | PSTN Dial-in | ❌ |
 | Async Messaging (Chat) | ❌ |
 | Interoperability with Microsoft Teams | ❌ |
 
 \* Some exceptions apply. The full list of supported [Call Automation capabilities](#how-to-conduct-calls-in-virtual-rooms) are listed in this document.
 
-\*\* Currently in [public preview](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).
-
 ## When to use Virtual Rooms
 
 Following table shows when to use Virtual Rooms.
@@ -70,7 +68,7 @@ At a high level, to conduct calls in a Virtual Rooms you need to create and mana
 | Virtual Rooms security-controls management - Set/Update flag to allow PSTN dial-out from specific Virtual Rooms   | ✔️ | ❌ |  ❌ |
 | Get list of users invited to join a Virtual Room | ✔️ | ❌ |  ❌ |
 | A user initiates a Virtual Rooms call or joins an in-progress call | ❌ | ✔️ |  ❌ |
-| Dial-out to a PSTN user  | ❌ | ✔️ | ✔️* |
+| Dial-out to a PSTN user  | ❌ | ✔️ | ✔️ |
 | Add/Remove VoIP participants to an in-progress call | ❌ | ✔️ |  ✔️* |
 | Get list of participants who joined the in-progress call | ❌ | ✔️ |  ✔️* |
 | Start/Stop call captions and change captions language | ❌ | ✔️ |  ❌ |
@@ -88,7 +86,7 @@ Call Automation SDK empowers developers to manage Virtual Rooms calls from the s
 
 | Call Automation capability | Supported in Rooms call | 
 | ------ | :------: |
-| Dial-out to PSTN participant * | ✔️ |
+| Dial-out to PSTN participant | ✔️ |
 | Send/Read DTMF to/from PSTN participant * | ✔️ |
 | Send announcements to specific call participants * | ✔️ |
 | Add/Remove a VoIP participant from an ongoing call | ✔️ |
@@ -129,7 +127,6 @@ Developers can allow/disallow the ability for call participants to dial-out to a
 1. A participant with Presenter role adds PSTN number into a call
 1. PSTN user accepts and joins a room call
 
-
 ### Virtual Rooms API/SDKs
 
 Rooms are created and managed via rooms APIs or SDKs. Use the rooms API/SDKs in your server application for `room` operations:
@@ -156,6 +153,8 @@ Room participants can be assigned one of the following roles: **Presenter**, **A
 
 The following table provides detailed capabilities mapped to the roles. At a high level, **Presenter** role has full control, **Attendee** capabilities are limited to audio and video, while **Consumer** can only receive audio, video, and screen sharing.
 
+<b>Note:</b> A PSTN call participant is not a part of Room roster, so a user role is not assigned to them. They capabilities are limited to mute/unmute themselves on the local device.
+
 | Capability | Role: Presenter | Role: Attendee | Role: Consumer
 |---------------------------------------------| :--------: | :--------: | :--------: |
 | **Mid call controls** | | |