In this post I will show how to implement “click to call” functionality for Asterisk written in C#, and using Asterisk manager API.
To use it you can launch the exe and put like argument the number to dial. Really simple but… works !
The code is subject to be improved and “beautified”.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Text.RegularExpressions;
using System.Configuration;
using System.Threading;

namespace Click2Call
{
class Program
{
[STAThread]
static void Main(string[] args)
{
if (args.Length != 1)
{
Console.WriteLine("Error !");
return;
}

string m_numerotmp = args[0];
if (m_numerotmp.Length =0)
{
Console.WriteLine("Number incorrect");
return;
}

string m_numero = string.Empty;
for (int i = 0; i < m_numerotmp.Length; i++)
{
int test = 0;
if (int.TryParse(m_numerotmp.Substring(i,1),out test))
{
m_numero = m_numero + m_numerotmp.Substring(i, 1);
}
}

Console.WriteLine("calling..... " + m_numero);

System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationSectionGroup grpApp = config.GetSectionGroup("applicationSettings");
ClientSettingsSection secPropSet = (ClientSettingsSection)grpApp.Sections["EdiClick2Call.Properties.Settings"];
string m_Extension = secPropSet.Settings.Get("extension").Value.ValueXml.InnerText;
string m_ippbx = secPropSet.Settings.Get("ippbx").Value.ValueXml.InnerText;
string m_user = secPropSet.Settings.Get("login").Value.ValueXml.InnerText;
string m_pass = secPropSet.Settings.Get("password").Value.ValueXml.InnerText;

Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse(m_ippbx), 5038);
clientSocket.Connect(serverEndPoint);
clientSocket.Send(Encoding.ASCII.GetBytes("Action: Login\r\nUsername: " + m_user + "\r\nSecret: "+m_pass+"\r\nActionID: 1\r\n\r\n"));
int bytesRead = 0;
do
{
byte[] buffer = new byte[1024];
bytesRead = clientSocket.Receive(buffer);

string response = Encoding.ASCII.GetString(buffer, 0, bytesRead);
Console.WriteLine(response);

if(Regex.Match(response, "Message: Authentication accepted", RegexOptions.IgnoreCase).Success)
{

clientSocket.Send(Encoding.ASCII.GetBytes("Action: Originate\r\nChannel: SIP/" + m_Extension + "\r\nExten: " + m_numero + "\r\nContext: from-internal\r\nPriority: 1\r\nCallerID: " + m_Extension + "\r\n\r\n"));
Console.WriteLine("Calling......");
Thread.Sleep(1000);
return;
}
}while(bytesRead != 0);
}
}

}

/etc/asterisk/manager.conf

[<user>]
secret = <password>
deny=0.0.0.0/0.0.0.0
permit=127.0.0.1/255.255.255.0
permit=<LAN address>
read = system,call,log,verbose,command,agent,user,config,command,dtmf,reporting,cdr,dialplan,originate
write = system,call,log,verbose,command,agent,user,config,command,dtmf,reporting,cdr,dialplan,originate
writetimeout = 5000

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