Merge pull request #295445 from lisaleehan/patch-4

Update calling-sdk-features.md

Author: prmerger-automator[bot]

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

@@ -46,6 +46,7 @@ Once you start development, check out the [known issues page](../known-issues.md
 - **Media Stats** - The Calling SDK provides comprehensive insights into [the metrics](media-quality-sdk.md) of your VoIP and video calls. With this information, developers have a clearer understanding of call quality and can make informed decisions to further enhance their communication experience.
 - **Video Constraints** - The Calling SDK provides APIs that gain the ability to regulate [video quality among other parameters](../../quickstarts/voice-video-calling/get-started-video-constraints.md) during video calls by adjusting parameters such as resolution and frame rate supporting different call situations for different levels of video quality
 - **User Facing Diagnostics (UFD)** - The Calling SDK provides [events](user-facing-diagnostics.md) that are designed to provide insights into underlying issues that could affect call quality. Developers can subscribe to triggers such as weak network signals or muted microphones, ensuring that they're always aware of any factors impacting the calls.
+- **Real Time Text (RTT)** - [Real Time Text (RTT)](real-time-text.md) provides developers with the ability to transmit text in near real-time during a call. This feature is designed to empower individuals who have difficulty speaking, ensuring their text messages are displayed prominently to other meeting participants, similar to spoken communication.
 
 ## Detailed capabilities
 
@@ -102,6 +103,7 @@ The following list presents the set of features that are currently available in
 |      | Echo cancellation | ❌   | ✔️| ✔️| ✔️   |
 |      | Noise suppression   | ✔️   | ✔️| ✔️| ✔️   |
 |      | Automatic gain control (AGC) | ❌   | ✔️| ✔️| ✔️   |
+| Accessibility   | [Real Time Text (RTT)](real-time-text.md) | ✔️   | ✔️| ✔️| ✔️   |
 | Notifications <sup>4</sup>    | [Push notifications](../../how-tos/calling-sdk/push-notifications.md)   | ✔️  | ✔️| ✔️| ✔️   |
 | Custom context    | Add [User-to-User (UUI)](../../how-tos/calling-sdk/call-context.md) or custom headers to a call     | ✔️   | ❌| ❌| ❌   |