Place a call

At the top of the ViewController class, right below the client declaration, add a NXMCall property to hold a reference to any call in progress

class ViewController: UIViewController, NXMClientDelegate {
    ...
    let client = NXMClient.shared
    var call: NXMCall?
    ...
}

Based on the object referenced by the call property, the callButtonPressed method can now be used to either place or end calls; the placeCall and endCall methods are triggered for each case.

Replace the current callButtonPressed method with the code below:

@IBAction func callButtonPressed(_ sender: Any) {
    if call == nil {
        placeCall()
    } else {
        endCall()
    }
}

func placeCall() {
    callButton.setTitle("End Call", for: .normal)
    client.serverCall(withCallee: "PHONE_NUMBER", customData: nil) {  [weak self] (error, call) in
        if let error = error {
            self?.connectionStatusLabel.text = error.localizedDescription
            self?.callButton.setTitle("Call", for: .normal)
        }
        self?.call = call
    }
}

func endCall() {
    call?.hangup()
    call = nil
    callButton.setTitle("Call", for: .normal)
}

That's it! You can now build, run and place the call! Magic!

Once the call comes through you can answer it and hear the in-app voice call.

Webhooks

As you proceed with placing the call, please switch to the terminal and notice the /voice/answer endpoint being called to retrieve the NCCO:

Also, as the call progresses through various stages, /voice/event is being sent events: