How do i get number on first or second ring from usb modem in c#

See more:

C#

ATCommands

Hi,
I made a caller ID app using C# 4.5. I am able to get phone number , however, number I get is on 3rd or 4th ring .
I would like to get Number on first or second to avoid call drop or delay in picking up.

Here's my code :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;

namespace callerid
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public SerialPort sp;
        string dataReceived = string.Empty;
        private delegate void SetTextDeleg(string text);


        private void Form1_Load(object sender, EventArgs e)
        {
            sp = new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One);
            this.sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
            try
            {
                sp.Open();
            }
            catch (Exception ex)
            {
                sp.Close();
                sp.Open();
            }
            this.sp.WriteLine("AT#cid=1" + System.Environment.NewLine);
            this.WindowState = FormWindowState.Minimized;
            //notifyIcon1.Icon = SystemIcons.Application;
            //this.serialPort1.WriteLine("AT#cid=1" + System.Environment.NewLine);
        }
        void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                Thread.Sleep(500);
                string x = sp.ReadLine(); // will read to the first carriage return
                this.BeginInvoke(new SetTextDeleg(si_DataReceived), new object[] { x });
            }
            catch
            { }
        }

        private void si_DataReceived(string data)
        {
            dataReceived = data.Trim();
            textBox1.Text = dataReceived;
           
            richTextBox1.Text = dataReceived+richTextBox1.Text;
           
        }

        
                
    }
}

Is there any AT Command which I can change.

Thanks

What I have tried:

I tried using HyperTerminal , there I get
RING

DATE = xxxxx

TIME = xxxx

NMBR = xxxxxxxxx

NAME = xxxxxxxx

RING

RING …

On first ring , but using my code I get data one by one after each ring