avoid PSTN and use Telephony

Author: DominikMe

articles/communication-services/concepts/includes/identifiers/identifiers-android.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-ios.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-java.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-js.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` interface represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` interface represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-net.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-python.md

@@ -15,7 +15,7 @@ ms.author: domessin
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifier` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage

articles/communication-services/concepts/includes/identifiers/identifiers-rest.md

@@ -17,7 +17,7 @@ In REST APIs, the identifier is a polymorphic type: you construct a JSON object
 
 ### Communication User identifier
 
-The `CommunicationUserIdentifierModel` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interop or PSTN features.
+The `CommunicationUserIdentifierModel` represents a user identity that was created using the [Identity SDK or REST API](../../../quickstarts/access-tokens.md). It's the only identifier used if your application doesn't use Microsoft Teams interoperability or Telephony features.
 
 
 #### Basic usage