How to Start Session Initiation Protocol Projects Using OMNeT++

To start a Session Initiation Protocol (SIP) project using OMNeT++ we can replicate the SIP-based interaction in a network environment to start, alter, and finish multimedia sessions like voice calls, video conferencing, and so on,. While OMNeT++ environment doesn’t have direct support for SIP, we will want to execute SIP from scratch or prolong the existing components like INET Framework to assist SIP operations.

Below is a comprehensive method to get started with a SIP project in OMNeT++:

Steps to Start SIP Project in OMNeT++

Set Up OMNeT++ Environment

Download and Install OMNeT++

We should download and install the OMNeT++ environment on the system.

Adhere to the installation guidance based on the operating system.
Confirm that OMNeT++ functions properly by executing sample simulations like the ones are offered within the INET Framework.

Install INET Framework

INET Framework has several network protocols like TCP, UDP, IP with transport layers that are required to replicate SIP traffic.
Copy its GitHub repository to download INET.
Construct and set the framework INET within OMNeT++.

Understand SIP Basics

SIP is frequently utilised to initiate, alter, and finish multimedia sessions. It functions on the OSI model Application Layer and normally employs UDP or TCP since their transport protocol. Below is a simple outline for SIP operations:

INVITE: It establishes a session or call.
ACK: Verifies the receipt of a response.
BYE: It helps to end a session.
REGISTER: Enrols the client including a SIP server.
OPTIONS: Requests the abilities of a server or client.

SIP messages are frequently left over UDP or TCP and these are utilised for configuring calls or other interaction sessions among the clients which is called User Agents, or UAs.

Create a New OMNeT++ Project

Create a Project:
- Go to OMNeT++ and select File > New > OMNeT++ Project.
- Name it to the project as SIPProject.
Link to INET Framework:
- Right-click on the project, select Properties > Project References, and connect to the project with INET Framework.

Design the Network Topology

A simple SIP simulation needs the following modules:

SIP Clients (User Agents): Devices which establish and obtain the SIP-based interaction like softphones or SIP-enabled devices.
SIP Server: A server which manages the SIP demands such as SIP Proxy or SIP Registrar.
Network Links: To link the clients and the server.

We can make a simple network topology in OMNeT++ to utilise the NED file format. Here is an instance of a basic network configuration:

Example SIPNetwork.ned:

network SIPNetwork {

submodules:

sipClient1: StandardHost {

@display(“p=100,100”);

}

sipClient2: StandardHost {

@display(“p=300,100”);

}

sipServer: StandardHost {

@display(“p=200,100”);

}

router: Router {

@display(“p=200,200”);

}

connections allowunconnected:

sipClient1.pppg++ <–> router.pppg++;

sipClient2.pppg++ <–> router.pppg++;

router.pppg++ <–> sipServer.pppg++;

}

This example includes:

sipClient1 and sipClient2: These two SIP clients are starting interaction.
sipServer: The SIP server handling the SIP demands.
router: A router, which enables interaction among the clients and the server.

Implement SIP Client and Server Modules

While OMNeT++ doesn’t directly SIP support then we want to execute own SIP Client (User Agent) and SIP Server (Proxy/Registrar) modules.

SIP Client (User Agent):

A SIP client transmits the requests like INVITE, BYE to start and end sessions. Also, client obtains responses from the server such as OK, TRYING, RINGING.

In OMNeT++, basic SIP Client can be executed since a subclass of cSimpleModule:

class SIPClient : public cSimpleModule {

protected:

cTcpSocket *socket;

cMessage *sendInviteMessage;

cMessage *sendByeMessage;

virtual void initialize() {

socket = new cTcpSocket();

sendInviteMessage = new cMessage(“SendINVITE”);

sendByeMessage = new cMessage(“SendBYE”);

scheduleAt(simTime() + 1.0, sendInviteMessage); // Send INVITE after 1 second

}

virtual void handleMessage(cMessage *msg) {

if (msg == sendInviteMessage) {

socket->connect(“sipServer”, 5060); // Connect to SIP server

socket->send(“INVITE sip:sipServer SIP/2.0\r\n”);

socket->send(“To: <sip:[email protected]>\r\n”);

socket->send(“From: <sip:[email protected]>\r\n”);

socket->send(“\r\n”);

} else if (msg == sendByeMessage) {

socket->send(“BYE sip:sipServer SIP/2.0\r\n”);

}

virtual void finish() {

delete socket;

delete sendInviteMessage;

delete sendByeMessage;

}

};

SIP Server (Proxy/Registrar):

The SIP server pays attention for incoming requests like INVITE, BYE, and so on. and replies with suitable SIP responses (200 OK, 180 Ringing, 404 Not Found, etc.).

Below is a simple outline of SIP Server:

class SIPServer : public cSimpleModule {

protected:

cTcpServerSocket *serverSocket;

virtual void initialize() {

serverSocket = new cTcpServerSocket(5060, this); // Listen on port 5060

}

virtual void handleMessage(cMessage *msg) {

if (msg->isSelfMessage()) {

cTcpMessage *tcpMessage = check_and_cast<cTcpMessage*>(msg);

if (tcpMessage->getName() == “INVITE”) {

sendResponse(“200 OK”);

} else if (tcpMessage->getName() == “BYE”) {

sendResponse(“200 OK”);

}

void sendResponse(const char* response) {

// Send SIP response back to the client

cTcpMessage *responseMsg = new cTcpMessage(response);

send(responseMsg, “out”);

}

virtual void finish() {

delete serverSocket;

}

};

Configure Simulation Parameters in omnetpp.ini

Now, we want to set the SIP simulation metrics like:

SIP Client Settings: Timing for transmitting responses like INVITE, BYE, and so on.
SIP Server Settings: Pay attention to ports and response times.

Here’s an example omnetpp.ini:

network = SIPNetwork

sim-time-limit = 100s

# SIP Client Settings

*.sipClient1.sendInviteMessage = true

*.sipClient1.sendByeMessage = false

*.sipClient1.serverAddress = “sipServer”

*.sipClient1.port = 5060

# SIP Server Settings

*.sipServer.listenPort = 5060

# Enable debugging for SIP communication

*.sipClient1.debug = true

*.sipServer.debug = true

Run the Simulation

Make use of OMNeT++’s Qtenv or Tkenv graphical environment to initiate the simulation.
Observe the SIP client and server interaction like:
- Make sure that SIP messages such as INVITE, BYE, 200 OK, and so on are correctly exchanged among the clients and the server.
- Monitor the timing and series of messages.
Check for Errors: Make certain that messages are properly handled and that the system gracefully manages the failures.

Analyze and Optimize

When the simulation is executing then we can examine the following:

SIP Message Flow: Make sure that message exchange correctly among the SIP clients and the server.
Performance: Estimate the duration for initiating and ending calls.
Error Handling: Confirm how the system manages the errors like connection failures or invalid SIP messages.

Extend the Project

We can improve the project by:

Multiple Clients: Replicate several SIP clients to communicate with the server.
SIP Authentication: Execute the SIP authentication mechanisms such as SIP Digest Authentication.
Advanced SIP Features: It helps for aspects such as call forwarding, hold, transfer, and voice mail.
Security: For encrypted interaction, replicate the secure SIP (SIPS) including TLS.

Documentation and Reporting

It offers essential insights of the project including:

Network Topology: Define the SIP client-server architecture.
Protocol Simulation: Explain how SIP messages are managed and swapped.
Simulation Results: Distribute performance outcomes, message timing, and any challenges are faced during execution.

We developed a complete simulation process for replicating and analysing the Session Initiation Protocol Projects with OMNeT++ tool, and we can expand its depth for more clarity if required.

Allow us to take care of your Session Initiation Protocol project performance! We will provide you with a clear summary and exceptional guidance. Contact phdprojects.org for personalized research assistance, and we will be delighted to help you quickly.