simple play with interrupt Sample

This inbound or outbound application sample starts by playing a wav file (long.wav). Before the play has completed you should interrupt it (using the rest_interrupt web service). Once the play action has been interrupted the application is redirected to a page that issues a new play action to acknowledge the interrupt and say goodbye.

This application requires the wav file long.wav to be available in the cloud media store.

Uses actions: Play

JSON
C#
VB
Java
Python
PHP

{
    "actions" :
    [
        {
            "play" :
            {
                "play_list" :
                [
                    {
                        "file_to_play" : "long.wav"
                    }
                ]
            }
        }
    ],
    "token" : "my instance id",
    "api_version": "2.0"
}

{
    "actions" :
    [
        {
            "play" :
            {
                "play_list" :
                [
                    {
                        "text_to_say" : "This call has been interrupted. Goodbye."
                    }
                ]
            }
        }
    ],
    "token" : "my instance id",
    "api_version": "2.0"
}

{
    [
    ],
    "token" : "Error for Action: xxxx  ActionIndex: xxxx  Result: xxxx"
}

```
{
}
```

ASP.Net Web App
ASP.Net Core Web App

Implementing this sample as an ASP.Net Web application:

// CSharp Wrapper sample for the Aculab Telephony REST API.
//
// Simple Play With Interrupt:
// A simple application that plays a long wav file to an answered inbound call.
// It is intended to be interrupted using the rest_interrupt web service.

using System;
using System.Collections.Generic;
using System.IO;
using Aculab.Cloud.RestAPIWrapper;

public partial class SimplePlayWithInterrupt : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(Request);
        String callFrom = ourRequest.InstanceInfo.ThisCall.CallFrom;

        // Only write out the app instanced id if we haven't yet finished
        if (ourRequest.InstanceInfo.ActionResult == null)
        {
            File.WriteAllText(Path.GetTempPath() + "SimplePlayWithInterrupt.txt", ourRequest.InstanceInfo.ApplicationInstanceId);
        }

        // Setup the actions
        List<TelephonyAction> actions = new List<TelephonyAction>();
        Play playAction = Play.PlayFile("long.wav");
        actions.Add(playAction);

        // Respond
        String token = String.Format("my instance id");
        TelephonyResponse ourResponse = new TelephonyResponse(actions, token);
        ourResponse.ToHttpResponse(Response);
    }
}

// CSharp Wrapper sample for the Aculab Telephony REST API.
//
// A page from the Simple Play With Interrupt sample:
// This acknowledges the interrupt to play by saying some text
// before the call is hung up.
using System;
using System.Collections.Generic;
using Aculab.Cloud.RestAPIWrapper;

public partial class AcknowledgeInterrupt : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(Request);

        // Get interrupt details from the action result.
        string previousAction = ourRequest.InstanceInfo.ActionResult.Action;
        bool interrupted = ourRequest.InstanceInfo.ActionResult.Interrupted;

        // Setup the actions
        List<TelephonyAction> actions = new List<TelephonyAction>();
        if (interrupted)
        {
            Play playAction = Play.SayText("This call has been interrupted. Goodbye.");
            actions.Add(playAction);
        }

        // Respond
        TelephonyResponse ourResponse = new TelephonyResponse(actions, "my instance id");
        ourResponse.ToHttpResponse(Response);
    }
}

using System;
using Aculab.Cloud.RestAPIWrapper;

public partial class ErrorPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(Request);
        ErrorResult result = ourRequest.InstanceInfo.ErrorResult;

        String token = String.Format("Action: {0}\nActionIndex: {1}\nResult: {2}",
            result.Action, result.ActionIndex, result.Result);

        // Respond
        TelephonyResponse ourResponse = new TelephonyResponse(null, token);
        ourResponse.ToHttpResponse(Response);
    }
}

using System;
using Aculab.Cloud.RestAPIWrapper;

public partial class FinalPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(Request);
    }
}

Implementing this sample as an ASP.Net Core Web application:

// ASP.NET Core CSharp Wrapper sample for the Aculab Telephony REST API.
//
// Simple Play With Interrupt:
// A simple application that plays a long wav file to an answered inbound call.
// It is intended to be interrupted using the rest_interrupt web service.

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Aculab.Cloud.RestAPIWrapper;
using System.IO;
using System.Net;
using System.Threading.Tasks;

namespace Aculab.Cloud.RESTAPI.NETCoreCSharpSamples.Controllers
{
    [Route("SimplePlayWithInterrupt")]
    public class SimplePlayWithInterruptController : ControllerBase
    {
        // Process the GET or POST request, set up the actions and construct the json response.
        [Route("FirstPage")]
        [HttpGet]
        [HttpPost]
        [ProducesResponseType(200)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> SimplePlayWithInterrupt()
        {
            try
            {
                // Unpack the request
                var telephonyRequest = await TelephonyRequest.UnpackRequestAsync(Request);
                String callFrom = telephonyRequest.InstanceInfo.ThisCall.CallFrom;
                
                // Only write out the app instanced id if we haven't yet finished
                if (telephonyRequest.InstanceInfo.ActionResult == null)
                {
                    System.IO.File.WriteAllText(Path.GetTempPath() + "SimplePlayWithInterrupt.txt", telephonyRequest.InstanceInfo.ApplicationInstanceId);
                }

                // Setup the actions required
                List<TelephonyAction> actions = new List<TelephonyAction>();
                Play playAction = Play.PlayFile("long.wav");
                actions.Add(playAction);

                // Create response
                String token = String.Format("my instance id");
                TelephonyResponse ourResponse = new TelephonyResponse(actions, token);
                return new OkObjectResult(ourResponse.ToJson(this));
            }
            catch (ArgumentException)
            {
                return BadRequest();
            }
            catch (Exception e)
            {
                return StatusCode((int)HttpStatusCode.InternalServerError, e.Message);
            }
        }
    }
}

// ASP.NET Core CSharp Wrapper sample for the Aculab Telephony REST API.
//
// Simple Play With Interrupt:
// A simple application that plays a long wav file to an answered inbound call.
// It is intended to be interrupted using the rest_interrupt web service.

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Aculab.Cloud.RestAPIWrapper;
using System.IO;
using System.Net;
using System.Threading.Tasks;

namespace Aculab.Cloud.RESTAPI.NETCoreCSharpSamples.Controllers
{
    [Route("SimplePlayWithInterrupt")]
    public class SimplePlayWithInterruptController : ControllerBase
    {
        // Process the GET or POST request, set up the actions and construct the json response.
        [Route("AcknowledgeInterrupt")]
        [HttpGet]
        [HttpPost]
        [ProducesResponseType(200)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> AcknowledgeInterrupt()
        {
            try
            {
                // Unpack the request
                var telephonyRequest = await TelephonyRequest.UnpackRequestAsync(Request);

                // Get interrupt details from the action result.
                string previousAction = telephonyRequest.InstanceInfo.ActionResult.Action;
                bool interrupted = telephonyRequest.InstanceInfo.ActionResult.Interrupted;

                // Setup the actions required
                List<TelephonyAction> actions = new List<TelephonyAction>();
                if (interrupted)
                {
                    Play playAction = Play.SayText("This call has been interrupted. Goodbye.");
                    actions.Add(playAction);
                }

                // Create response
                TelephonyResponse ourResponse = new TelephonyResponse(actions, "my instance id");
                return new OkObjectResult(ourResponse.ToJson(this));
            }
            catch (ArgumentException)
            {
                return BadRequest();
            }
            catch (Exception e)
            {
                return StatusCode((int)HttpStatusCode.InternalServerError, e.Message);
            }
        }
    }
}

// ASP.NET Core CSharp Wrapper sample for the Aculab Telephony REST API.

using System;
using Microsoft.AspNetCore.Mvc;
using Aculab.Cloud.RestAPIWrapper;
using System.Net;
using System.Threading.Tasks;

namespace Aculab.Cloud.RESTAPI.NETCoreCSharpSamples.Controllers
{
    public class RESTSampleController : ControllerBase
    {
        // Process the GET or POST request for the Error condition
        [Route("ErrorPage")]
        [HttpGet]
        [HttpPost]
        [ProducesResponseType(200)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> ErrorPage()
        {
            try
            {
                // Unpack the request
                var telephonyRequest = await TelephonyRequest.UnpackRequestAsync(Request);
                ErrorResult result = telephonyRequest.InstanceInfo.ErrorResult;

                String token = String.Format("Action: {0}\nActionIndex: {1}\nResult: {2}",
                    result.Action, result.ActionIndex, result.Result);

                // Create response
                TelephonyResponse ourResponse = new TelephonyResponse(null, token);
                return new OkObjectResult(ourResponse.ToJson(this));
            }
            catch (ArgumentException)
            {
                return BadRequest();
            }
            catch (Exception e)
            {
                return StatusCode((int)HttpStatusCode.InternalServerError, e.Message);
            }
        }
    }
}

// ASP.NET Core CSharp Wrapper sample for the Aculab Telephony REST API.

using System;
using Microsoft.AspNetCore.Mvc;
using Aculab.Cloud.RestAPIWrapper;
using System.Net;
using System.Threading.Tasks;

namespace Aculab.Cloud.RESTAPI.NETCoreCSharpSamples.Controllers
{
    public class RESTSampleController : ControllerBase
    {
        // Process the GET or POST request for the Final Page
        [Route("FinalPage")]
        [HttpGet]
        [HttpPost]
        [ProducesResponseType(200)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> FinalPage()
        {
            try
            {
                // Unpack the request
                var telephonyRequest = await TelephonyRequest.UnpackRequestAsync(Request);
                String token = telephonyRequest.InstanceInfo.Token;

                // Create response
                // Only very limited actions can be returned here
                TelephonyResponse ourResponse = new TelephonyResponse(null, token);
                return new OkObjectResult(ourResponse.ToJson(this));
            }
            catch (ArgumentException)
            {
                return BadRequest();
            }
            catch (Exception e)
            {
                return StatusCode((int)HttpStatusCode.InternalServerError, e.Message);
            }
        }
    }
}

Implemented as an ASP.Net Web App:

' Visual Basic Wrapper sample for the Aculab Telephony REST API.
'
' The first page for the Simple Play With Interrupt sample:
' A simple application that plays a long wav file to an answered inbound call.
' It is intended to be interrupted using the rest_interrupt web service.
Imports System.Collections.Generic
Imports System.IO
Imports Aculab.Cloud.RestAPIWrapper

Partial Class SimplePlayWithInterrupt
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        ' Unpack the request
        Dim ourRequest As TelephonyRequest = New TelephonyRequest(Request)
        Dim callFrom As String = ourRequest.InstanceInfo.ThisCall.CallFrom

        ' Only write out the app instanced id if we haven't yet finished
        If IsNothing(ourRequest.InstanceInfo.ActionResult) Then
            File.WriteAllText(Path.GetTempPath() + "SimplePlayWithInterrupt.txt", ourRequest.InstanceInfo.ApplicationInstanceId)
        End If

        ' Setup the actions
        Dim actions As List(Of TelephonyAction) = New List(Of TelephonyAction)
        Dim playAction As Play = Play.PlayFile("long.wav")
        actions.Add(playAction)

        ' Respond
        Dim token As String = String.Format("my instance id")
        Dim ourResponse As TelephonyResponse = New TelephonyResponse(actions, token)
        ourResponse.ToHttpResponse(Response)
    End Sub
End Class

' Visual Basic Wrapper sample for the Aculab Telephony REST API.
'
' A page from the Simple Play With Interrupt sample:
' This acknowledges the interrupt to play by saying some text
' before the call is hung up.
Imports System.Collections.Generic
Imports Aculab.Cloud.RestAPIWrapper

Partial Class AcknowledgeInterrupt
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        ' Unpack the request
        Dim ourRequest As TelephonyRequest = New TelephonyRequest(Request)

        ' Get interrupt details from the action result.
        Dim previousAction As String = ourRequest.InstanceInfo.ActionResult.Action
        Dim interrupted As Boolean = ourRequest.InstanceInfo.ActionResult.Interrupted

        ' Setup the actions
        Dim actions As List(Of TelephonyAction) = New List(Of TelephonyAction)
        If interrupted Then
            Dim playAction As Play = Play.SayText("This call has been interrupted. Goodbye.")
            actions.Add(playAction)
        End If

        ' Respond
        Dim token As String = String.Format("my instance id")
        Dim ourResponse As TelephonyResponse = New TelephonyResponse(actions, token)
        ourResponse.ToHttpResponse(Response)
    End Sub
End Class

' Visual Basic Wrapper sample for the Aculab Telephony REST API.
'
' A generic error page for all the samples.
Imports Aculab.Cloud.RestAPIWrapper

Partial Class ErrorPage
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        ' Unpack the request
        Dim ourRequest As TelephonyRequest = New TelephonyRequest(Request)
        Dim result As ErrorResult = ourRequest.InstanceInfo.ErrorResult

        Dim token As String = String.Format("Action: {0}\nActionIndex: {1}\nResult: {2}", _
            result.Action, result.ActionIndex, result.Result)

        ' Respond
        Dim ourResponse As TelephonyResponse = New TelephonyResponse(token)
        ourResponse.ToHttpResponse(Response)
    End Sub
End Class

' Visual Basic Wrapper sample for the Aculab Telephony REST API.
'
' A generic final page for all the samples:
Imports Aculab.Cloud.RestAPIWrapper

Partial Class FinalPage
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        ' Unpack the request
        Dim ourRequest As TelephonyRequest = New TelephonyRequest(Request)

        ' Do application tidying up
        ' ...
    End Sub
End Class

Implemented as a Java Servlet:

// Java Servlet sample for the Aculab Telephony REST API.
//
// Simple Play With Interrupt:
// A simple application that plays a long wav file to an answered inbound call.
// It is intended to be interrupted using the rest_interrupt web service.

package com.aculab.telephonyrestapi.samples;

import javax.servlet.http.*;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.io.File;

import com.aculab.telephonyrestapi.*;

public class SimplePlayWithInterrupt extends HttpServlet
{
	private static final long serialVersionUID = 5134039861818805711L;

	@Override
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
       	handleRequest(request, response);
    }
    
    @Override
    public void doPost(HttpServletRequest request,
            HttpServletResponse response)
                    throws IOException, ServletException
    {
    	handleRequest(request, response);
    }
    
    private void handleRequest(HttpServletRequest request,
                               HttpServletResponse response) throws IOException
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(request);

        String callFrom = ourRequest.getInstanceInfo().getThisCall().getCallFrom();
        
        // Write the application instanced id to file if we haven't yet finished
        if (ourRequest.getInstanceInfo().getActionResult() == null)
        {
            String tempFilePath = System.getProperty("java.io.tmpdir");
            String SimplePlayWithInterrupt_filename = tempFilePath + File.separator + "SimplePlayWithInterrupt.txt";
            PrintWriter appInstanceFile = new PrintWriter(SimplePlayWithInterrupt_filename);
            appInstanceFile.write(ourRequest.getInstanceInfo().getApplicationInstanceId());
            appInstanceFile.close();
        }

        // Setup the actions
        List<TelephonyAction> actions = new ArrayList<TelephonyAction>();
        Play playAction = Play.playFile("long.wav"); 
        actions.add(playAction);

        // Respond
        String token = "my instance id";
        TelephonyResponse ourResponse = new TelephonyResponse(actions, token);
        ourResponse.setHttpServletResponse(response);
    }
}

// Java Servlet sample for the Aculab Telephony REST API.
//
// A page from the Simple Play With Interrupt sample:
// This acknowledges the interrupt to play by saying some text
// before the call is hung up.

package com.aculab.telephonyrestapi.samples;

import javax.servlet.http.*;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.aculab.telephonyrestapi.*;

public class AcknowledgeInterrupt extends HttpServlet
{
	private static final long serialVersionUID = -2939417779810757027L;

	@Override
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
       	handleRequest(request, response);
    }
    
    @Override
    public void doPost(HttpServletRequest request,
            HttpServletResponse response)
                    throws IOException, ServletException
    {
    	handleRequest(request, response);
    }
    
    private void handleRequest(HttpServletRequest request,
                               HttpServletResponse response) throws IOException
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(request);

        // Get interrupt details from the action result.
        ActionResult result = ourRequest.getInstanceInfo().getActionResult();
        String previousAction = result.getAction();
        boolean interrupted = result.getInterrupted();

        // Setup the actions
        List<TelephonyAction> actions = new ArrayList<TelephonyAction>();
        Play playAction = Play.sayText("This call has been interrupted. Goodbye.");
        actions.add(playAction);

        // Respond
        String token = "my instance id";
        TelephonyResponse ourResponse = new TelephonyResponse(actions, token);
        ourResponse.setHttpServletResponse(response);
    }
}

// Java Servlet sample for the Aculab Telephony REST API.
//

package com.aculab.telephonyrestapi.samples;

import javax.servlet.http.*;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.aculab.telephonyrestapi.*;

public class ErrorPage extends HttpServlet
{
    private static final long serialVersionUID = -4842873371047361437L;

    @Override
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
       	handleRequest(request, response);
    }
    
    @Override
    public void doPost(HttpServletRequest request,
            HttpServletResponse response)
                    throws IOException, ServletException
    {
    	handleRequest(request, response);
    }
    
    private void handleRequest(HttpServletRequest request,
                               HttpServletResponse response) throws IOException
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(request);

        ErrorResult result = ourRequest.getInstanceInfo().getErrorResult();

        String token = String.format("Action: %s\nActionIndex: %d\nResult: %s", result.getAction(), result.getActionIndex(), result.getResult());
        
        // Respond
        List<TelephonyAction> actions = new ArrayList<TelephonyAction>();
        TelephonyResponse ourResponse = new TelephonyResponse(actions, token);
        ourResponse.setHttpServletResponse(response);
    }
}

// Java Servlet sample for the Aculab Telephony REST API.
//

package com.aculab.telephonyrestapi.samples;

import javax.servlet.http.*;
import javax.servlet.ServletException;
import java.io.IOException;
import com.aculab.telephonyrestapi.*;

public class FinalPage extends HttpServlet
{
    private static final long serialVersionUID = 5940620014313056844L;

    @Override
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
       	handleRequest(request, response);
    }
    
    @Override
    public void doPost(HttpServletRequest request,
            HttpServletResponse response)
                    throws IOException, ServletException
    {
    	handleRequest(request, response);
    }
    
    private void handleRequest(HttpServletRequest request,
                               HttpServletResponse response) throws IOException
    {
        // Unpack the request
        TelephonyRequest ourRequest = new TelephonyRequest(request);
    }
}

Implemented as a Flask web application:

@app.route('/SimplePlayWithInterrupt', methods=['GET','POST'])
def handle_SimplePlayWithInterrupt():

    my_request = TelephonyRequest(request)
    app_inst_id = my_request.get_application_instance_id()
    print("SimplePlayWithInterrupt: app_inst_id='{}'".format(app_inst_id))

    play_action = Play(file_to_play='long.wav')
    print("Application Instance ID: {0}".format(app_inst_id))
    
    list_of_actions = []
    list_of_actions.append(play_action)
    my_response = TelephonyResponse(list_of_actions, token='my instance id')
    return my_response.get_json()

@app.route('/AcknowledgeInterrupt', methods=['GET','POST'])
def handle_AcknowledgeInterrupt():

    my_request = TelephonyRequest(request)
    my_token = my_request.get_token()

    print("Play was interrupted")
    list_of_actions = []
    list_of_actions.append(Play(text_to_say='This call has been interrupted. Goodbye.'))
    my_response = TelephonyResponse(list_of_actions, "my instance id")
    return my_response.get_json()

@app.route('/ErrorPage', methods=['GET','POST'])
def handle_ErrorPage():
    
    my_request = TelephonyRequest(request)
    token = my_request.get_token()
    app_inst_id = my_request.get_application_instance_id()
    error_result_dict = my_request.get_error_result()
    action_string = error_result_dict.get('action', "?")
    result_string = error_result_dict.get('result', "?")
    print("ErrorPage: app_inst_id='{}' token='{}' action='{}' result='{}'".format(app_inst_id, token, action_string, result_string))
    
    my_response = TelephonyResponse([Play(text_to_say='An error has occurred')])
    return my_response.get_json()

@app.route('/FinalPage', methods=['GET','POST'])
def handle_FinalPage():
    # The FinalPage handler follows the guidelines on:
    # https://www.aculab.com/cloud/voice-and-fax-apis/rest-api/rest-api-version-2/rest-api-version-2/writing-a-rest-application
    # The guidelines are:
    #   "Your final page should return an empty response, a 204 is preferable, but empty JSON is acceptable."
    my_request = TelephonyRequest(request)
    token = my_request.get_token()
    app_inst_id = my_request.get_application_instance_id()
    print("FinalPage: app_inst_id='{}' token='{}'".format(app_inst_id, token))
    empty_json = '{}'.encode('utf-8')
    return empty_json

<?php
header("Content-Type: application/json; charset=UTF-8");

require __DIR__ . "/../../autoload.php";

use Aculab\TelephonyRestAPI\Play;
use Aculab\TelephonyRestAPI\Response;
use Aculab\TelephonyRestAPI\InstanceInfo;

// write the application instance id to the error log, so it can be used to interrupt the play
$info = InstanceInfo::getInstanceInfo();
$appInstanceId = $info->getApplicationInstanceId();

$info_file = sys_get_temp_dir() . DIRECTORY_SEPARATOR . "simple_play_with_interrupt.txt";
$f = fopen($info_file, "w");
fwrite($f, 'ApplicationInstanceId to interrupt is:' . $appInstanceId);
fclose($f);

$play = new Play();
$play->addFile('long.wav');

$response = new Response();
$response->setToken('my instance id');
$response->addAction($play);

print $response;

<?php
header("Content-Type: application/json; charset=UTF-8");

require __DIR__ . "/../../autoload.php";

use Aculab\TelephonyRestAPI\Play;
use Aculab\TelephonyRestAPI\Response;

$play = new Play();
$play->addText('This call has been interrupted. Goodbye.');

$response = new Response();
$response->setToken('my instance id');
$response->addAction($play);

print $response;

<?php
header("Content-Type: application/json; charset=UTF-8");

require __DIR__ . "/../../autoload.php";

use Aculab\TelephonyRestAPI\Play;
use Aculab\TelephonyRestAPI\Response;
use Aculab\TelephonyRestAPI\InstanceInfo;

$info = InstanceInfo::getInstanceInfo();

$error = $info->getErrorResult();
$action = $error->getAction();
$desc = $error->getResult();
if (!is_null($action)) {
    error_log("Error from action \"$action\" with result:" . PHP_EOL . "$desc" . PHP_EOL);
} else {
    error_log("Error result:" . PHP_EOL . "$desc" . PHP_EOL);
}

$response = new Response();
$response->setToken('Error');

$play = new Play();
$play->addText('An error has occurred.');
$response->addAction($play);

print $response;

<?php
require __DIR__ . "/../../autoload.php";

http_response_code(204);
header("Content-Type: application/json; charset=UTF-8");

use Aculab\TelephonyRestAPI\InstanceInfo;

$info = InstanceInfo::getInstanceInfo();
$call = $info->getThisCallInfo();
$callid = $call->getCallId();
$duration = $call->getSecondsCallDuration();
error_log("This call id: $callid" . PHP_EOL . "This call duration: $duration" . PHP_EOL);