Review Edits

Uppercase Phone Calling, it is the name of the product.

Author: vac0224

articles/communication-services/concepts/telephony/telephony-concept.md

@@ -37,7 +37,7 @@ If you answer **yes** to the following questions, then Voice Calling (PSTN) is t
 With this option:
 - You get numbers directly from Microsoft and can call phones around the world.
 - You don't need to deploy or maintain any on-premises system because Voice Calling (PSTN) operates through Azure Communication Services.
-- 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 Pprivate branch exchanges (PBXs), analog devices, and other third-party telephony equipment supported by the SBC.
+- 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), analog devices, and other third-party telephony equipment supported by the SBC.
 
 This option requires an uninterrupted connection to Azure Communication Services.  
 

articles/communication-services/concepts/telephony/try-phone-calling.md

@@ -1,5 +1,5 @@
 ---
-title: Try phone calling - Azure Communication Services
+title: Try Phone Calling - Azure Communication Services
 description: Confirm a phone number can connect without an app or other code.
 author: boris-bazilevskiy
 manager: dacarte
@@ -28,15 +28,15 @@ Try Phone Calling, now in public preview, is a tool in Azure preview portal to h
 
 ## Overview
 
-Open the [Azure Preview Portal](https://preview.portal.azure.com/#home) and search for **Try Phone Calling**. Then Enter a phone number, select a caller ID for this call, and the tool generates the code. You can also select **Use my connection string** and Try Phone Calling automatically gets the `connection string` for the resource.
+Open the [Azure preview portal](https://preview.portal.azure.com/#home) and search for **Try Phone Calling**. Then Enter a phone number, select a caller ID for this call, and the tool generates the code. You can also select **Use my connection string** and Try Phone Calling automatically gets the `connection string` for the resource.
 
 ![alt text](../media/try-phone-calling.png "Make a phone call")
 
 You can run generated code right from the tool page and see the status of the call. You can also copy the generated code into an application and enrich it with other Azure Communication Services features such as chat, SMS, and voice and video calling.
 
-## Azure Preview Portal
+## Azure preview portal
 
-The Try Phone Calling tool is in public preview, and is only available from the [Azure Preview Portal](https://preview.portal.azure.com/#home).
+The Try Phone Calling tool is in public preview, and is only available from the [Azure preview portal](https://preview.portal.azure.com/#home).
 
 ## Next steps