How to implement Call Kit in your VOIP iOS WebRTC application

Posted By : Ravi Ranjan | 04-Jan-2021

Before the call Kit framework,  Picking up a call with a voice-over IP application was a very difficult task as it totally relies on push notification and once you missed the push notification boom you can't receive that call. To overcome this problem Apple has to introduce its own Framework to support voice over IP application. The Voice over IP application faced a lot of barrier due to accessibility with Push notification which are :

  1. Some time users do not receive any push Notification.
  2. Sometimes due to network issue the user receive push notification too late.
  3. Once the user is on a call with a Native call he can't Pick up the Voice over IP call.
  4. There is no facility for putting calls on hold, block users, decline calls directly with the Push notification service.

To solve all these Required issues Apple introduces a call kit framework which gives The native UI for incoming or outgoing, CallKit displays the same interfaces as the Phone app, thus your app features a native look and feel. Besides, CallKit does respond to system-level behaviors such as, Do Not Disturb, in an appropriate manner. Also in addition to handling calls, you can provide a Call Directory app extension to provide caller ID information and a list of blocked numbers associated with your service. For more documentation, you can visit the Apple Documentation link for call kit Framework by clicking here.

 

Also Read: How To Maintain Threads In iOS Applications

 

How to Use Apple call kit Framework for our application :

Before diving into implementation first 

  • Open Info.plist and add to the category for Required background modes, which should be present by default of type Array, and set its value as: App provides Voice over IP services

Now let's start the implementation :

  1. To receive a call:

    import callKit

        override func viewDidLoad() {

            let provider = CXProvider(configuration: CXProviderConfiguration(localizedName: "My App"))

            provider.setDelegate(self, queue: nil)

            let update = CXCallUpdate()

            update.remoteHandle = CXHandle(type: .generic, value: "I am calling you!")

            provider.reportNewIncomingCall(with: UUID(), update: update, completion: { error in })

        }

        func providerDidReset(_ provider: CXProvider) {

        }

        func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {

            action.fulfill()

        }

        func provider(_ provider: CXProvider, perform action: CXEndCallAction) {

            action.fulfill()

        }
    Once you run the application you will see an incoming call on your device. Now you can use this function accourding to your need 

     

  2. To Make call from your application :
     

    import UIKit

    import CallKit

    class ViewController: UIViewController, CXProviderDelegate {

        override func viewDidLoad() {

            let provider = CXProvider(configuration: CXProviderConfiguration(localizedName: "My App"))

            provider.setDelegate(self, queue: nil)

            let controller = CXCallController()

            let transaction = CXTransaction(action: CXStartCallAction(call: UUID(), handle: CXHandle(type: .generic, value: "You are calling me!!!")))

            controller.request(transaction, completion: { error in })

        }

        func providerDidReset(_ provider: CXProvider) {

        }

    }

    By the above methods you can create call. 
    Above are the basic implementation of call kit you can customise this according to your usage. 

 

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About Author

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Ravi Ranjan

Extensively involved in the field of iOS application development with a demonstrated history of working. He is passionate about learning new technology. The quest to learn is the primary goal which is deeply rooted within him.

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