diff --git a/Signal/src/call/OutboundCallInitiator.swift b/Signal/src/call/OutboundCallInitiator.swift
index 52dea9a40..ace6715b0 100644
--- a/Signal/src/call/OutboundCallInitiator.swift
+++ b/Signal/src/call/OutboundCallInitiator.swift
@@ -46,7 +46,35 @@ import Foundation
             return false
         }
 
-        callUIAdapter.startAndShowOutgoingCall(recipientId: recipientId)
+        
+        // Check for microphone permissions
+        // Alternative way without prompting for permissions:
+        // if AVAudioSession.sharedInstance().recordPermission() == .denied {
+        AVAudioSession.sharedInstance().requestRecordPermission { isGranted in
+            // Here the permissions are either granted or denied
+            guard isGranted == true else {
+                Logger.warn("\(self.TAG) aborting due to missing microphone permissions.")
+                self.showNoMicrophonePermissionAlert()
+                return
+            }
+            callUIAdapter.startAndShowOutgoingCall(recipientId: recipientId)
+        }
         return true
     }
+    
+    /// Cleanup and present alert for no permissions
+    private func showNoMicrophonePermissionAlert() {
+        let alertTitle = NSLocalizedString("CALL_AUDIO_PERMISSION_TITLE", comment:"Alert Title")
+        let alertMessage = NSLocalizedString("CALL_AUDIO_PERMISSION_MESSAGE", comment:"Alert message")
+        let alertController = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .alert)
+        let dismiss = NSLocalizedString("DISMISS_BUTTON_TEXT", comment: "Generic short text for button to dismiss a dialog")
+        let dismissAction = UIAlertAction(title: dismiss, style: .default)
+        let settingsString = NSLocalizedString("CALL_VIEW_SETTINGS_NAG_SHOW_CALL_SETTINGS", comment: "Settings button text")
+        let settingsAction = UIAlertAction(title: settingsString, style: .default) { _ in
+            UIApplication.shared.openURL(URL(string: UIApplicationOpenSettingsURLString)!)
+        }
+        alertController.addAction(dismissAction)
+        alertController.addAction(settingsAction)
+        UIApplication.shared.frontmostViewController?.present(alertController, animated: true, completion: nil)
+    }
 }
diff --git a/Signal/translations/en.lproj/Localizable.strings b/Signal/translations/en.lproj/Localizable.strings
index eac2b6e1d..da4e6c0c6 100644
--- a/Signal/translations/en.lproj/Localizable.strings
+++ b/Signal/translations/en.lproj/Localizable.strings
@@ -55,7 +55,7 @@
 /* Format string for file extension label in call interstitial view */
 "ATTACHMENT_APPROVAL_FILE_EXTENSION_FORMAT" = "File type: %@";
 
-/* Format string for file size label in call interstitial view */
+/* Format string for file size label in call interstitial view. Embeds: {{file size as 'N mb' or 'N kb'}}. */
 "ATTACHMENT_APPROVAL_FILE_SIZE_FORMAT" = "Size: %@";
 
 /* Label for 'send' button in the 'attachment approval' dialog. */
@@ -160,6 +160,12 @@
 /* Title format for action sheet that offers to block an unknown user.Embeds {{the unknown user's name or phone number}}. */
 "BLOCK_OFFER_ACTIONSHEET_TITLE_FORMAT" = "Block %@?";
 
+/* Alert message */
+"CALL_AUDIO_PERMISSION_MESSAGE" = "Signal requires access to your microphone to make calls. You can grant this permission in the Settings app";
+
+/* Alert Title */
+"CALL_AUDIO_PERMISSION_TITLE" = "Call failed";
+
 /* Accessibilty label for placing call button */
 "CALL_LABEL" = "Call";
 
@@ -178,7 +184,8 @@
 /* Label for button that dismiss the call view's settings nag. */
 "CALL_VIEW_SETTINGS_NAG_NOT_NOW_BUTTON" = "Not Now";
 
-/* Label for button that shows the privacy settings */
+/* Label for button that shows the privacy settings
+   Settings button text */
 "CALL_VIEW_SETTINGS_NAG_SHOW_CALL_SETTINGS" = "Show Privacy Settings";
 
 /* notification action */
@@ -229,12 +236,6 @@
 /* table cell label in conversation settings */
 "CONVERSATION_SETTINGS_BLOCK_THIS_USER" = "Block this user";
 
-/* The message of the 'text message too large' alert. */
-"CONVERSATION_VIEW_TEXT_MESSAGE_TOO_LARGE_ALERT_MESSAGE" = "This message is too long to send.";
-
-/* The title of the 'text message too large' alert. */
-"CONVERSATION_VIEW_TEXT_MESSAGE_TOO_LARGE_ALERT_TITLE" = "Error";
-
 /* ActionSheet title */
 "CORRUPTED_SESSION_DESCRIPTION" = "Resetting your session will allow you to receive future messages from %@, but it will not recover any already corrupted messages.";