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react-native-webrtc / react-native-callkeep

iOS CallKit framework and Android ConnectionService for React Native
ISC License
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android call-kit callkit connection-service connectionservice ios react-native voip webrtc

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React Native CallKeep

npm version npm downloads

React Native CallKeep utilises a brand new iOS 10 framework CallKit and Android ConnectionService to make the life easier for VoIP developers using React Native.

For more information about CallKit on iOS, please see Official CallKit Framework Document or Introduction to CallKit by Xamarin

For more information about ConnectionService on Android, please see Android Documentation and Build a calling app

⚠️ CallKit and ConnectionService are only available on real devices, this library will not work on simulators.

Summary

Demo

A demo of react-native-callkeep is available in the wazo-react-native-demo repository.

Android

Connection Service

iOS

Connection Service

Installation

npm install --save react-native-callkeep
# or
yarn add react-native-callkeep

Usage

Setup

import RNCallKeep from 'react-native-callkeep';

const options = {
  ios: {
    appName: 'My app name',
  },
  android: {
    alertTitle: 'Permissions required',
    alertDescription: 'This application needs to access your phone accounts',
    cancelButton: 'Cancel',
    okButton: 'ok',
    imageName: 'phone_account_icon',
    additionalPermissions: [PermissionsAndroid.PERMISSIONS.example],
    // Required to get audio in background when using Android 11
    foregroundService: {
      channelId: 'com.company.my',
      channelName: 'Foreground service for my app',
      notificationTitle: 'My app is running on background',
      notificationIcon: 'Path to the resource icon of the notification',
    }, 
  }
};

RNCallKeep.setup(options).then(accepted => {});

iOS only.

Alternative on iOS you can perform setup in AppDelegate.m. Doing this allows capturing events prior to the react native event bridge being up. Please be aware that calling setup in AppDelegate.m will ignore any subsequent calls to RNCallKeep.setup();.

@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{ 
  self.bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];

  [RNCallKeep setup:@{
    @"appName": @"Awesome App",
    @"maximumCallGroups": @3,
    @"maximumCallsPerCallGroup": @1,
    @"supportsVideo": @NO,
  }];

  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:self.bridge
                                                   moduleName:@"App"
                                            initialProperties:nil];

  // ======== OTHER CODE REDACTED ==========

  return YES;
}

setup calls internally registerPhoneAccount, registerEvents and setSettings.

You can alternatively just call setSettings() with the same option as setup() to define only your settings.

Usage with Expo

To use this library with Expo, you will need to create a development build. Expo Go does not support custom native modules. For information on how to create and run a development build, visit: Create a development build - Expo Documentation. You can use and test this library with a development build installed on your physical device (iOS and Android).

Constants

To make passing the right integer into methods easier, there are constants that are exported from the module.

const CONSTANTS = {
  END_CALL_REASONS: {
    FAILED: 1,
    REMOTE_ENDED: 2,
    UNANSWERED: 3,
    ANSWERED_ELSEWHERE: 4,
    DECLINED_ELSEWHERE: 5,
    MISSED: 6
  }
};

const { CONSTANTS as CK_CONSTANTS, RNCallKeep } from 'react-native-callkeep';

console.log(CK_CONSTANTS.END_CALL_REASONS.FAILED) // outputs 1

Android Self Managed Mode

This feature is available only on Android.

Android supports calling apps running in what's called "Self Managed". This means the apps are able (and required) to provide their own UI for managing calls. This includes both in call UI elements and incoming call notification UI. This method is all or nothing. You can't mix partial elements, such as having a custom in call view, but use the default incoming call UI.

To implement a self managed calling app, the following steps are necessary:

Self Managed calling apps are an advanced topic, and there are many steps involved in implementing them, but here are some things to keep in mind:

⚠️ To be able to use the self managed mode, you'll have to add the READ_CALL_LOG permission in your android/src/main/AndroidManifest.xml file:

<uses-permission android:name="android.permission.READ_CALL_LOG" />

API

Method Return Type iOS Android
getInitialEvents() Promise<String[]> ✅ ✅
clearInitialEvents() void> ✅ ✅
setAvailable() Promise<void> ❌ ✅
setForegroundServiceSettings() Promise<void> ❌ ✅
canMakeMultipleCalls() Promise<void> ❌ ✅
setCurrentCallActive() Promise<void> ❌ ✅
checkIsInManagedCall() Promise<Boolean> ❌ ✅
isCallActive() Promise<Boolean> ✅ ❌
getCalls() Promise<Object[]> ✅ ❌
displayIncomingCall() Promise<void> ✅ ✅
answerIncomingCall() Promise<void> ✅ ✅
startCall() Promise<void> ✅ ✅
updateDisplay() Promise<void> ✅ ✅
endCall() Promise<void> ✅ ✅
endAllCalls() Promise<void> ✅ ✅
rejectCall() Promise<void> ✅ ✅
reportEndCallWithUUID() Promise<void> ✅ ✅
setMutedCall() Promise<void> ✅ ✅
setOnHold() Promise<void> ✅ ✅
setConnectionState() Promise<void> ❌ ✅
checkIfBusy() Promise<Boolean> ✅ ❌
checkSpeaker() Promise<Boolean> ✅ ❌
toggleAudioRouteSpeaker() Promise<void> ❌ ✅
supportConnectionService() Promise<Boolean> ❌ ✅
hasPhoneAccount() Promise<Boolean> ❌ ✅
hasOutgoingCall() Promise<Boolean> ❌ ✅
hasDefaultPhoneAccount() Promise<Boolean> ❌ ✅
checkPhoneAccountEnabled() Promise<Boolean> ❌ ✅
isConnectionServiceAvailable() Promise<Boolean> ❌ ✅
backToForeground() Promise<void> ❌ ✅
removeEventListener() void ✅ ✅
registerPhoneAccount() void ❌ ✅
registerAndroidEvents() void ❌ ✅

getInitialEvents

If there were some actions performed by user before JS context has been created, this method would return early fired events. This is alternative to "didLoadWithEvents" event.

RNCallKeep.getInitialEvents();

clearInitialEvents

Clear all pending actions returned by getInitialEvents().

RNCallKeep.clearInitialEvents();

setAvailable

This feature is available only on Android.

Tell ConnectionService that the device is ready to make outgoing calls via the native Phone app. If not the user will be stuck in the build UI screen without any actions. Eg: Call it with false when disconnected from the sip client, when your token expires, when your user log out ... Eg: When your used log out (or the connection to your server is broken, etc..), you have to call setAvailable(false) so CallKeep will refuse the call and your user will not be stuck in the native UI.

RNCallKeep.setAvailable(true);

setForegroundServiceSettings

This feature is available only on Android.

Configures the Foreground Service used for Android 11 to get microphone access on background. Similar to set the foregroundService key in the setup() method.

RNCallKeep.setForegroundServiceSettings({
    channelId: 'com.company.my',
    channelName: 'Foreground service for my app',
    notificationTitle: 'My app is running on background',
    notificationIcon: 'Path to the resource icon of the notification',
});

canMakeMultipleCalls

This feature is available only on Android.

Disable the "Add call" button in ConnectionService UI.

RNCallKeep.canMakeMultipleCalls(false); // Enabled by default

setCurrentCallActive

This feature is available only on Android.

Mark the current call as active (eg: when the callee has answered). Necessary to set the correct Android capabilities (hold, mute) once the call is set as active. Be sure to set this only after your call is ready for two way audio; used both incoming and outgoing calls.

RNCallKeep.setCurrentCallActive(uuid);

checkIsInManagedCall

This feature is available only on Android.

Returns true if there is an active native call

RNCallKeep.checkIsInManagedCall();

isCallActive

This feature is available only on IOS.

Returns true if the UUID passed matches an existing and answered call. This will return true ONLY if the call exists and the user has already answered the call. It will return false if the call does not exist or has not been answered. This is exposed to both React Native and Native sides. This was exposed so a call can be canceled if ringing and the user answered on a different device.

RNCallKeep.isCallActive(uuid);

getCalls

This feature is available only on IOS.

Returns a Promise. The result will be an array with all current calls and their states.

RNCallKeep.getCalls();

response:
[{
  callUUID: "E26B14F7-2CDF-48D0-9925-532199AE7C48",
  hasConnected: true,
  hasEnded: false,
  onHold: false,
  outgoing: false,
}]

displayIncomingCall

Display system UI for incoming calls

RNCallKeep.displayIncomingCall(uid, handle, localizedCallerName = '', handleType = 'number', hasVideo = false, options = null);

answerIncomingCall

Use this to tell the sdk a user answered a call from the app UI.

RNCallKeep.answerIncomingCall(uuid)

startCall

When you make an outgoing call, tell the device that a call is occurring. The argument list is slightly different on iOS and Android:

iOS:

RNCallKeep.startCall(uuid, handle, contactIdentifier, handleType, hasVideo);

Android:

RNCallKeep.startCall(uuid, handle, contactIdentifier);

updateDisplay

Use this to update the display after an outgoing call has started.

RNCallKeep.updateDisplay(uuid, displayName, handle)

endCall

When finish an incoming/outgoing call.
(When user actively chooses to end the call from your app's UI.)

RNCallKeep.endCall(uuid);

endAllCalls

End all ongoing calls.

RNCallKeep.endAllCalls();

rejectCall

When you reject an incoming call.

RNCallKeep.rejectCall(uuid);

reportEndCallWithUUID

Report that the call ended without the user initiating.
(Not ended by user, is usually due to the following reasons)

RNCallKeep.reportEndCallWithUUID(uuid, reason);

setMutedCall

Switch the mic on/off.

RNCallKeep.setMutedCall(uuid, true);

setOnHold

Set a call on/off hold.

RNCallKeep.setOnHold(uuid, true)

setConnectionState

This feature is available only on Android.

Change the state of the call

RNCallKeep.setConnectionState(uuid, state)

checkIfBusy

This feature is available only on IOS.

Checks if there are any active calls on the device and returns a promise with a boolean value (true if there're active calls, false otherwise).

RNCallKeep.checkIfBusy();

checkSpeaker

This feature is available only on IOS.

Checks if the device speaker is on and returns a promise with a boolean value (true if speaker is on, false otherwise).

RNCallKeep.checkSpeaker();

toggleAudioRouteSpeaker

This feature is available only on Android.

Update the audio route of Audio Service on Android with a routeSpeaker boolean value (true if speaker need on, false otherwise). When Phone call is active, Android control the audio via connection service. so this function help to toggle the audio to Speaker or wired/ear-piece or vice-versa 

RNCallKeep.toggleAudioRouteSpeaker(uuid, true);

getAudioRoutes

Get the list of available audio routes. i.e. bluetooth, wired/ear-piece, speaker and phone.

await RNCallKeep.getAudioRoutes(): AudioRoute;
type AudioRoute = {
    name: string,
    type: string
}

setAudioRoute

Set audio route using a route from getAudioRoutes.

await RNCallKeep.setAudioRoute(uuid, routeName);

supportConnectionService

This feature is available only on Android.

Tells if ConnectionService is available on the device (returns a boolean).

RNCallKeep.supportConnectionService();

hasPhoneAccount (async)

This feature is available only on Android.

Checks if the user has enabled the phone account for your application. A phone account must be enable to be able to display UI screen on incoming call and make outgoing calls from native Contact application.

Returns a promise of a boolean.

await RNCallKeep.hasPhoneAccount();

hasOutgoingCall (async)

This feature is available only on Android, useful when waking up the application for an outgoing call.

When waking up the Android application in background mode (eg: when the application is killed and the user make a call from the native Phone application). The user can hang up the call before your application has been started in background mode, and you can lost the RNCallKeepPerformEndCallAction event.

To be sure that the outgoing call is still here, you can call hasOutgoingCall when you app waken up.

const hasOutgoingCall = await RNCallKeep.hasOutgoingCall();

hasDefaultPhoneAccount

This feature is available only on Android.

Checks if the user has set a default phone account. If the user has not set a default they will be prompted to do so with an alert.

This is a workaround for an issue affecting some Samsung devices.

const options = {
  alertTitle: 'Default not set',
  alertDescription: 'Please set the default phone account'
};

RNCallKeep.hasDefaultPhoneAccount(options);

checkPhoneAccountEnabled

This feature is available only on Android.

Checks if the user has set a default phone account and it's enabled.

It's useful for custom permission prompts. It should be used in pair with registerPhoneAccount Similar to hasDefaultPhoneAccount but without trigering a prompt if the user doesn't have a phone account.

RNCallKeep.checkPhoneAccountEnabled();

isConnectionServiceAvailable

This feature is available only on Android.

Check if the device support ConnectionService.

RNCallKeep.checkPhoneAccountEnabled();

backToForeground

This feature is available only on Android.

Use this to display the application in foreground if the application was in background state. This method will open the application if it was closed.

RNCallKeep.backToForeground();

removeEventListener

Allows to remove the listener on an event.

RNCallKeep.removeEventListener('checkReachability');

registerPhoneAccount

Registers Android phone account manually, useful for custom permission prompts when you don't want to call setup(). This method is called by setup, if you already use setup you don't need it.

This feature is available only on Android. On iOS you still have to call setup().

RNCallKeep.registerPhoneAccount(options);

registerAndroidEvents

Registers Android UI events, useful when you don't want to call setup(). This method is called by setup, if you already use setup you don't need it.

This feature is available only on Android. On iOS you still have to call setup().

RNCallKeep.registerAndroidEvents();

Events

Event iOS Android
didReceiveStartCallAction ✅ ✅
answerCall ✅ ✅
endCall ✅ ✅
didActivateAudioSession ✅ ✅
didDisplayIncomingCall ✅ ✅
didPerformSetMutedCallAction ✅ ✅
didToggleHoldCallAction ✅ ✅
didPerformDTMFAction ✅ ✅
didLoadWithEvents ✅ ❌
showIncomingCallUi ❌ ✅
silenceIncomingCall ❌ ✅
checkReachability ❌ ✅
didChangeAudioRoute ✅ ✅
onHasActiveCall ❌ ✅

didReceiveStartCallAction

Device sends this event once it decides the app is allowed to start a call, either from the built-in phone screens (iOS/Recents, Android/Contact), or by the app calling RNCallKeep.startCall.

Try to start your app call action from here (e.g. get credentials of the user by data.handle and/or send INVITE to your SIP server)

Note: on iOS callUUID is not defined as the call is not yet managed by CallKit. You have to generate your own and call startCall.

RNCallKeep.addEventListener('didReceiveStartCallAction', ({ handle, callUUID, name }) => {

});

answerCall

User answer the incoming call

RNCallKeep.addEventListener('answerCall', ({ callUUID }) => {
  // Do your normal `Answering` actions here.
});

endCall

User finish the call.

RNCallKeep.addEventListener('endCall', ({ callUUID }) => {
  // Do your normal `Hang Up` actions here
});

didActivateAudioSession

The AudioSession has been activated by RNCallKeep.

RNCallKeep.addEventListener('didActivateAudioSession', () => {
  // you might want to do following things when receiving this event:
  // - Start playing ringback if it is an outgoing call
});

didDisplayIncomingCall

Callback for RNCallKeep.displayIncomingCall

RNCallKeep.addEventListener('didDisplayIncomingCall', ({ error, callUUID, handle, localizedCallerName, hasVideo, fromPushKit, payload }) => {
  // you might want to do following things when receiving this event:
  // - Start playing ringback if it is an outgoing call
});

didPerformSetMutedCallAction

A call was muted by the system or the user:

RNCallKeep.addEventListener('didPerformSetMutedCallAction', ({ muted, callUUID }) => {

});

didToggleHoldCallAction

A call was held or unheld by the current user

RNCallKeep.addEventListener('didToggleHoldCallAction', ({ hold, callUUID }) => {

});

didChangeAudioRoute

Triggered when the audio route has been changed.

RNCallKeep.addEventListener('didChangeAudioRoute', ({ output }) => {

});

didPerformDTMFAction

Used type a number on his dialer

RNCallKeep.addEventListener('didPerformDTMFAction', ({ digits, callUUID }) => {

});

didLoadWithEvents

iOS only.

Called as soon as JS context initializes if there were some actions performed by user before JS context has been created.

Since iOS 13, you must display incoming call on receiving PushKit push notification. But if app was killed, it takes some time to create JS context. If user answers the call (or ends it) before JS context has been initialized, user actions will be passed as events array of this event. Similar situation can happen if user would like to start a call from Recents or similar iOS app, assuming that your app was in killed state.

In order for this event to reliably fire, it's necessary to perform setup in AppDelegate.m

NOTE: You still need to subscribe / handle the rest events as usuall. This is just a helper whcih cache and propagate early fired events if and only if for "the native events which DID fire BEFORE js bridge is initialed", it does NOT mean this will have events each time when the app reopened.

// register `didLoadWithEvents` somewhere early in your app when it is ready to handle callkeep events.

RNCallKeep.addEventListener('didLoadWithEvents', (events) => {
  // `events` is passed as an Array chronologically, handle or ignore events based on the app's logic
  // see example usage in https://github.com/react-native-webrtc/react-native-callkeep/pull/169 or https://github.com/react-native-webrtc/react-native-callkeep/pull/205
});

showIncomingCallUi

Android only. Self Managed only.

Only when CallKeep is setup to be in self managed mode. Signals that the app must show an incoming call UI. The implementor must either call displayIncomingCall from react native or native android code to make this event fire.

RNCallKeep.addEventListener('showIncomingCallUi', ({ handle, callUUID, name }) => {

});

The following values will match those initially passed to displayIncomingCall

silenceIncomingCall

Android only. Self Managed only.

Corresponds to the native [onSilence event](https://developer.android.com/reference/android/telecom/Connection#onSilence()). The implementor should silence the corresponding incoming calls notification sound when and if this event is fired.

RNCallKeep.addEventListener('silenceIncomingCall', ({ handle, callUUID, name }) => {

});

The following values will match those initially passed to silenceIncomingCall

createIncomingConnectionFailed

Android only. Self Managed only.

Corresponds to the native onCreateIncomingConnectionFailed callback. The implementor should reject the incoming SIP INVITE with an appropriate status code, such as 483 User Busy. Android unfortunately does not provide the exact reason for refusing to let you accept an incoming call, but they do list a set of reasons here

RNCallKeep.addEventListener('createIncomingConnectionFailed', ({ handle, callUUID, name }) => {

});

The following values will match those initially passed to silenceIncomingCall

checkReachability

Android only.

On Android when the application is in background, after a certain delay the OS will close every connection with informing about it. So we have to check if the application is reachable before making a call from the native phone application.

RNCallKeep.addEventListener('checkReachability', () => {
  RNCallKeep.setReachable();
});

onHasActiveCall

Android only.

A listener that tells the JS side if a native call has been answered while there was an active self-managed call

RNCallKeep.addEventListener('onHasActiveCall', () => {
  // eg: End active app call if native call is answered
});

Example

A full example is available in the example folder.

import React from 'react';
import RNCallKeep from 'react-native-callkeep';
import uuid from 'uuid';

class RNCallKeepExample extends React.Component {
  constructor(props) {
    super(props);

    this.currentCallId = null;

    // Add RNCallKeep Events
    RNCallKeep.addEventListener('didReceiveStartCallAction', this.didReceiveStartCallAction);
    RNCallKeep.addEventListener('answerCall', this.onAnswerCallAction);
    RNCallKeep.addEventListener('endCall', this.onEndCallAction);
    RNCallKeep.addEventListener('didDisplayIncomingCall', this.onIncomingCallDisplayed);
    RNCallKeep.addEventListener('didPerformSetMutedCallAction', this.onToggleMute);
    RNCallKeep.addEventListener('didToggleHoldCallAction', this.onToggleHold);
    RNCallKeep.addEventListener('didPerformDTMFAction', this.onDTMFAction);
    RNCallKeep.addEventListener('didActivateAudioSession', this.audioSessionActivated);
  }

  // Initialise RNCallKeep
  setup = () => {
    const options = {
      ios: {
        appName: 'ReactNativeWazoDemo',
        imageName: 'sim_icon',
        supportsVideo: false,
        maximumCallGroups: '1',
        maximumCallsPerCallGroup: '1'
      },
      android: {
        alertTitle: 'Permissions Required',
        alertDescription:
          'This application needs to access your phone calling accounts to make calls',
        cancelButton: 'Cancel',
        okButton: 'ok',
        imageName: 'sim_icon',
        additionalPermissions: [PermissionsAndroid.PERMISSIONS.READ_CONTACTS]
      }
    };

    try {
      RNCallKeep.setup(options);
      RNCallKeep.setAvailable(true); // Only used for Android, see doc above.
    } catch (err) {
      console.error('initializeCallKeep error:', err.message);
    }
  }

  // Use startCall to ask the system to start a call - Initiate an outgoing call from this point
  startCall = ({ handle, localizedCallerName }) => {
    // Your normal start call action
    RNCallKeep.startCall(this.getCurrentCallId(), handle, localizedCallerName);
  };

  reportEndCallWithUUID = (callUUID, reason) => {
    RNCallKeep.reportEndCallWithUUID(callUUID, reason);
  }

  // Event Listener Callbacks

  didReceiveStartCallAction = (data) => {
    let { handle, callUUID, name } = data;
    // Get this event after the system decides you can start a call
    // You can now start a call from within your app
  };

  onAnswerCallAction = (data) => {
    let { callUUID } = data;
    // Called when the user answers an incoming call
  };

  onEndCallAction = (data) => {
    let { callUUID } = data;
    RNCallKeep.endCall(this.getCurrentCallId());

    this.currentCallId = null;
  };

  // Currently iOS only
  onIncomingCallDisplayed = (data) => {
    let { error } = data;
    // You will get this event after RNCallKeep finishes showing incoming call UI
    // You can check if there was an error while displaying
  };

  onToggleMute = (data) => {
    let { muted, callUUID } = data;
    // Called when the system or user mutes a call
  };

  onToggleHold = (data) => {
    let { hold, callUUID } = data;
    // Called when the system or user holds a call
  };

  onDTMFAction = (data) => {
    let { digits, callUUID } = data;
    // Called when the system or user performs a DTMF action
  };

  audioSessionActivated = (data) => {
    // you might want to do following things when receiving this event:
    // - Start playing ringback if it is an outgoing call
  };

  getCurrentCallId = () => {
    if (!this.currentCallId) {
      this.currentCallId = uuid.v4();
    }

    return this.currentCallId;
  };

  render() {
  }
}

Receiving a call when the application is not reachable.

In some case your application can be unreachable :

To be able to wake up your application to display the incoming call, you can use https://github.com/react-native-webrtc/react-native-voip-push-notification on iOS or BackgroundMessaging from react-native-firebase-(Optional)(Android-only)-Listen-for-FCM-messages-in-the-background).

You have to send a push to your application, like with Firebase for Android and with a library supporting PushKit pushes for iOS.

PushKit

Since iOS 13, you'll have to report the incoming calls that wakes up your application with a VoIP push. Add this in your AppDelegate.m if you're using VoIP pushes to wake up your application :

- (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(PKPushType)type withCompletionHandler:(void (^)(void))completion {
  // Process the received push
  [RNVoipPushNotificationManager didReceiveIncomingPushWithPayload:payload forType:(NSString *)type];

  // Retrieve information like handle and callerName here
  // NSString *uuid = /* fetch for payload or ... */ [[[NSUUID UUID] UUIDString] lowercaseString];
  // NSString *callerName = @"caller name here";
  // NSString *handle = @"caller number here";
  // NSDictionary *extra = [payload.dictionaryPayload valueForKeyPath:@"custom.path.to.data"]; /* use this to pass any special data (ie. from your notification) down to RN. Can also be `nil` */

  [RNCallKeep reportNewIncomingCall: uuid
                             handle: handle
                         handleType: @"generic"
                           hasVideo: NO
                localizedCallerName: callerName
                    supportsHolding: YES
                       supportsDTMF: YES
                   supportsGrouping: YES
                 supportsUngrouping: YES
                        fromPushKit: YES
                            payload: extra
              withCompletionHandler: completion];
}

Android 11

Since Android 11, your application requires to start a foregroundService in order to access the microphone in background. You'll need to upgrade your compileSdkVersion to 30 to be able to use this feature.

You have to set the foregroundService key in the setup() method and add a foregroundServiceType in the AndroidManifest file.

Debug

Android

adb logcat *:S RNCallKeep:V

Troubleshooting

Contributing

Any pull request, issue report and suggestion are highly welcome!

License

This work is dual-licensed under ISC and MIT. Previous work done by @ianlin on iOS is on ISC Licence. We choose MIT for the rest of the project.

SPDX-License-Identifier: ISC OR MIT