Audio communication by UDP

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C#2.0

C#

When we communicate with two different computers we communicate by audio.

the code as follow:
If one computer's ip is 192.168.1.1 and the other is 192.168.1.40 then we send the audio by port 11000 and receive the audio at port 9901.

socket  r = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
the part of code about receive audio
           byte[] br;
            r.Bind(new IPEndPoint(IPAddress.Any,9901));
            EndPoint send = (EndPoint)new IPEndPoint(IPAddress.Parse("192.168.1.1"), 9901);
            while (true)
                {
                br = new byte[16384];
                r.ReceiveFrom (br,ref send );
                m_Fifo.Write(br, 0, br.Length);
                }
r.SendTo(m_RecBuffer, new IPEndPoint(IPAddress.Parse("192.168.1.1"),11000));

Now, I use the code to comunicate with a 51DSP(we are communication by UDP Protocal). Ip and port are same as before but i cant receive the UDP packets which came from the 51DSP.

I hope someone who can help me to solve the problem.