Controlling events of a Twilio call

Question

In the next sample code, Twilio puts in conversation OPERATOR_PHONE_NUMBER to CLIENT_PHONE_NUMBER, and records the call.

But I don't know what should be the code to control some things, one or both of the phones...:

does not exist.
exists but communicates.
exists, does not communicate but does not pick up.

exists, does not communicate, picks up and the conversation takes place.

import com.twilio.Twilio;
import com.twilio.rest.api.v2010.account.Call;
import com.twilio.rest.api.v2010.account.CallCreator;
import com.twilio.type.PhoneNumber;
import com.twilio.type.Twiml;

public class SimpleCallWithRecording2 {
private static final String ACCOUNT_SID = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
private static final String AUTH_TOKEN  = "9ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ";

private static final String ASSIGNED_PHONE_NUMBER = "+15999999999999";  

//Must be verified numbers in trial account
private static final String OPERATOR_PHONE_NUMBER = "+34888888888";
private static final String CLIENT_PHONE_NUMBER   = "+34777777777";


public static void main(String[] args) throws Exception {   
    Twilio.init(ACCOUNT_SID, AUTH_TOKEN);

    PhoneNumber to = new PhoneNumber(OPERATOR_PHONE_NUMBER);

    PhoneNumber from = new PhoneNumber(ASSIGNED_PHONE_NUMBER);

    Twiml twiml = new Twiml(
        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>                    " +  
        "<Response>                                                    " +
        "   <Say voice=\"woman\">This is said by a robotic woman</Say> " +          
        "   <Dial>                                                     " +
        "      <Number> " + CLIENT_PHONE_NUMBER + "</Number>           " +
        "   </Dial>                                                    " +
        "</Response>                                                   " );

    CallCreator callCreator = Call.creator(to, from, twiml);
        callCreator.setRecord(true);

    Call call = callCreator.create();
    System.out.println(call);
}

}

In the doc I see something could be done with callCreator.setStatusCallback(URI.create("https://www.myapp.com/events")), and some clasification of events: "initiated", "ringing", "answered", "completed". BUT I havent find the code "on the other side", I mean in https://www.myapp.com/events extreme ¿?

Ra Ja Ra Ja · Accepted Answer · 2020-01-20T10:45:09

You need to setup a that rest endpoint and set it as status callback url. The url will recieve events from twilio.

Refer this

edit: if you also need events from the nested verb, define attribute 'action' to it.

ie

 <Dial action="//callbackURL">
 <Number>   CLIENT_PHONE_NUMBER  </Number> 
 </Dial>

that way you'll know your cases 1 ,2 ,3 ,4.

and to "control" the call, you just respond with the desired TwiML to the callback request. Hope this clarifies.

edit2: You need to do something like:

//handles callback url
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
{  //...
   TwiMLResponse twiml = new TwiMLResponse();
   String callSid = request.getParameter("CallSid");
   //handle call specific data
   switch(request.getParameter("CallStatus")){
      case "no-answer": //construct twiML
      case "ringing" ://...
    }
    //...
   response.setContentType("application/xml");
   response.getWriter().print(twiml.toXML());
}

See: IVR - Example

Controlling events of a Twilio call

1 Answers