diff --git a/res/values/strings.xml b/res/values/strings.xml
index 11b2d50..1cca867 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -175,4 +175,76 @@
     <string name="handle_restricted">RESTRICTED</string>
 
     <string name="toast_personal_call_msg">Using the personal dialer to make the call</string>
+
+    <!-- The "label" of the Notification for an incoming ringing call.
+         call_via refers to the name of the app the incoming call is coming from.
+         Example: Duo call from John Smith[CHAR LIMIT=60] -->
+    <string name="notification_incoming_call"><xliff:g id="call_via">%1$s</xliff:g> call from <xliff:g id="call_from">%2$s</xliff:g></string>
+
+    <!-- The "label" of the Notification for an incoming ringing video call.
+         call_via refers to the name of the app the incoming video call is coming from.
+         Example: Duo video call from John Smith[CHAR LIMIT=60] -->
+    <string name="notification_incoming_video_call"><xliff:g id="call_via">%1$s</xliff:g> video call from <xliff:g id="call_from">%2$s</xliff:g></string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause an ongoing call to be
+         disconnected.  This message is the part of the notification that informs the user that
+         answering the current ringing call will cause a call from another app to be disconnected.
+         Example: Answering will end your Duo call [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_call">Answering will end your <xliff:g id="call_via">%1$s</xliff:g> call</string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause other ongoing calls
+         to be disconnected.  This message is the part of the notification that informs the user
+         answering the current ringing call will cause calls from another app to be disconnected.
+         Example: Answering will end your Duo call [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_calls">Answering will end your <xliff:g id="call_via">%1$s</xliff:g> calls</string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause an ongoing video call
+         to be disconnected.  This message is the part of the notification that informs the user
+         that answering the current ringing call will cause a video call from another app to be
+         disconnected.
+         Example: Answering will end your Duo video call [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_video_call">Answering will end your <xliff:g id="call_via">%1$s</xliff:g> video call</string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause an ongoing call
+         to be disconnected.  This message is the part of the notification that informs the user
+         that answering the current ringing call will cause an ongoing call to be disconnected.
+         Similar to answering_ends_other_call, except does not specify which app.
+         [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_managed_call">Answering will end your ongoing call</string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause an ongoing call
+         to be disconnected.  This message is the part of the notification that informs the user
+         that answering the current ringing call will cause an ongoing call to be disconnected.
+         Similar to answering_ends_other_call, except does not specify which app.
+         [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_managed_calls">Answering will end your ongoing calls</string>
+
+    <!-- The "details" of a Notification for an incoming call which will cause an ongoing video call
+         to be disconnected.  This message is the part of the notification that informs the user
+         that answering the current ringing call will cause an ongoing video call to be
+         disconnected.
+         Similar to answering_ends_other_video_call, except does not specify which app.
+         [CHAR LIMIT=60] -->
+    <string name="answering_ends_other_managed_video_call">Answering will end your ongoing video call</string>
+
+    <!-- The "answer" button for an incoming call. [CHAR LIMIT=60] -->
+    <string name="answer_incoming_call">Answer</string>
+
+    <!-- The "decline" button for an incoming call. [CHAR LIMIT=60] -->
+    <string name="decline_incoming_call">Decline</string>
+
+    <!-- Error message shown to the user when an outgoing call cannot be placed due to an ongoing
+         phone call in a third-party app.  For example:
+         Call cannot be placed due to your Duo call. [CHAR LIMIT=none] -->
+    <string name="cant_call_due_to_ongoing_call">Call cannot be placed due to your <xliff:g id="other_call">%1$s</xliff:g> call.</string>
+
+    <!-- Error message shown to the user when an outgoing call cannot be placed due to ongoing
+         phone calls in a third-party app.  For example:
+         Call cannot be placed due to your Duo calls. [CHAR LIMIT=none] -->
+    <string name="cant_call_due_to_ongoing_calls">Call cannot be placed due to your <xliff:g id="other_call">%1$s</xliff:g> calls.</string>
+
+    <!-- Error message shown to the user when an outgoing call cannot be placed due to an ongoing
+         phone call in a third-party app.  Unlike cant_call_due_to_ongoing_call, this is used when
+         the name of the other app is not known. [CHAR LIMIT=none] -->
+    <string name="cant_call_due_to_ongoing_unknown_call">Call cannot be placed due to a call in another app.</string>
 </resources>