Anjali Jain (9910103580) Nitin Bansal (9910103589)

Push-to-talk (PTT), also known as Press-to-Transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.

Push to Talk over Cellular (PoC) is a service option for a cellular phone network that enables subscribers to use their phones as walkie-talkies with unlimited range. A typical Push-to-Talk connection connects almost instantly. A significant advantage of PoC / PTT is the ability for a single person to reach an active talk group with a single button press; users need not make several telephone calls to coordinate with a group.

THREE WAYS OF TRANSMISSION ::

INTERFACE FOR USERS ::

Screen 1 Settings Communication

WHAT’S NEW??

• Low Noise

• Behaves same as

telephonic conversation

not as Walkie - Talkie

LIMITATION

• Within a building that means low range and less distance covered

IMPLEMENTATION::Sender: UDP Socket programming

1. Create UDP Socket for sending datagram

DatagramSocket socket = new DatagramSocket();

2. Prepare datagram for sending

byte[] data = new byte[256];

InetAddress address = InetAddress.getByName("192.168.1.8");

DatagramPacket pack = null;

pack = new DatagramPacket(data, data.length, address, 8888);

3. Send

socket.send(pack);

4. Receive

Prepare new datagram first for holding the incoming packet. The array of byte must be clear in advance.

socket.receive(pack);

Receiver: UDP Socket programming1.Start listening for datagram on a certain socket DatagramSocket socket = new DatagramSocket(Server_Port);2. Prepare datagram for receiving byte[] data = new byte[256];DatagramPacket pack = new DatagramPacket(data, data.length);3. Start listening for a datagram socket.receive(pack);4. Obtaining the data and address and port of sender int port = pack.getPort();InetAddress address = pack.getAddress();String content = new String(pack.getData, 0, pack.getLength());

RESEARCH PAPER

1. A Client-Side Design and Implementation for Push to Talk over Cellular Service

http://ir.lib.nctu.edu.tw/bitstream/987654321/32034/1/A+Client-Side+Design+and+Implementation+for+Push+to+Talk+over+Cellular+Service.pdf

2. Practical Voice Communications in Challenged Networks

www.netlab.tkk.fi/~jo/papers/2009-08-dt-talkie.pdf