Auto Answering incoming calls

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using TAPI3Lib;

namespace my_tapi
{
    public partial class Form1 : Form
    {
        private TAPIClass topj;
        uint lines;
        int line;
        uint arg3;
        private callnotification cn;
        private ITAddress[] ia = new ITAddress[10];
        private bool h323, reject;
        int[] registertoken = new int[10];
        public Form1()
        {
            InitializeComponent();
            initializetapi3();
            h323 = false;
            reject = false;
            MessageBox.Show("موجود می باشد: " + lines, "خطوط");
        }
        public void answer()
        {
            IEnumCall ec = ia[line].EnumerateCalls();
            uint arg = 0;
            ITCallInfo ici;
            try
            {
                ec.Next(1, out ici, ref arg);
                ITBasicCallControl bc = (TAPI3Lib.ITBasicCallControl)ici;
                if (!reject)
                {
                    bc.Answer();
                }
                else
                {
                    bc.Disconnect(DISCONNECT_CODE.DC_REJECTED);
                    ici.ReleaseUserUserInfo();
                }
            }
            catch (Exception exp)
            {
                MessageBox.Show("There may not be any calls to answer! \n\n" + exp.ToString(), "TAPI3");
            }
        }
        public void initializetapi3()
        {
            topj = new TAPIClass();
            topj.Initialize();
            IEnumAddress ea = topj.EnumerateAddresses();
            ITAddress ln;
            uint arg3 = 0;
            lines = 0;
            cn = new callnotification();
            //cn.addtolist = new callnotification.listshow(this.status);
            topj.ITTAPIEventNotification_Event_Event += new ITTAPIEventNotification_EventEventHandler(cn.Event);
            topj.EventFilter=(int)(TAPI_EVENT.TE_CALLINFOCHANGE|TAPI_EVENT.TE_DIGITEVENT|TAPI_EVENT.TE_CALLSTATE|TAPI_EVENT.TE_PHONEEVENT|TAPI_EVENT.TE_GENERATEEVENT|TAPI_EVENT.TE_GATHERDIGITS|TAPI_EVENT.TE_REQUEST);
            for (int i = 0; i < 10; i++)
            {
                ea.Next(1, out ln, ref arg3);
                ia[i] = ln;
                if (ln != null)
                {
                    comboBox1.Items.Add(ia[i].AddressName);
                    lines++;
                }
                else
                    break;
            }
         }
        class callnotification : TAPI3Lib.ITTAPIEventNotification
        {

            public void Event(TAPI3Lib.TAPI_EVENT te, object eobj)
            {
                if (te == TAPI3Lib.TAPI_EVENT.TE_CALLSTATE)
                {
                    TAPI3Lib.ITCallStateEvent a = (TAPI3Lib.ITCallStateEvent)eobj;
                    TAPI3Lib.ITCallInfo b = a.Call;

                    if (b.CallState == TAPI3Lib.CALL_STATE.CS_OFFERING)
                    {
                        Console.WriteLine("Incoming Call!");
                        System.Threading.Thread.Sleep(2000);
                        string callerid = b.get_CallInfoString(CALLINFO_STRING.CIS_CALLERIDNUMBER);
                        Console.WriteLine(callerid);
                        callerid = b.get_CallInfoString(CALLINFO_STRING.CIS_CALLERIDNAME);
                        Console.WriteLine(callerid);
                        //answer();
                    }

                }
            }
        }
        public void status(string str)
        {
            listBox1.Items.Add(str);
        }
        static void main()
        {
            Application.Run();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            MessageBox.Show("برای برقراری ارتباط توسط یکی از ورودیها ابتدا یکی را انتخاب سپس دکمه ثبت را فشار دهید", "راهنمایی");
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            line = comboBox1.SelectedIndex;
        }

        private void register_Click(object sender, EventArgs e)
        {
           try
			{
				registertoken[line]=topj.RegisterCallNotifications(ia[line],true,true,TapiConstants.TAPIMEDIATYPE_AUDIO,2);	
				MessageBox.Show("Registration token : "+registertoken[line],"Registration Succeed for line "+line);
			}
			catch(Exception ein)
			{
				MessageBox.Show("خط انتخاب شده مناسب نمی باشد");
			}
        }
    }
}