The Foundations of SIP
4.3 (500 ratings)
Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
2,156 students enrolled

The Foundations of SIP

Learn the fundamentals of SIP to advance your VoIP career.
4.3 (500 ratings)
Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
2,156 students enrolled
Created by Keith Croxford
Last updated 7/2020
English [Auto]
Current price: $34.99 Original price: $49.99 Discount: 30% off
5 hours left at this price!
30-Day Money-Back Guarantee
This course includes
  • 4 hours on-demand video
  • 4 downloadable resources
  • Full lifetime access
  • Access on mobile and TV
  • Certificate of Completion
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What you'll learn
  • Pass SIP related questions in a job interview
  • Troubleshoot SIP issues
  • Explain how calls flow in a SIP network
  • You should have a general understanding of networking

SIP is  the standard in Voice Over IP communications.  Large telecom carriers are switching away from their legacy platforms into highly scalable next generation SIP networks. Even cellular phones are migrating to Voice Over LTE, which also relies on the SIP protocol.

By taking this course you will learn the fundamentals of the SIP protocol.  Knowledge of SIP has enabled me to land secure positions with world wide telecommunication companies. Are you ready for the same opportunities? 

In this course you will learn: 

  • What is SIP and the RFCs that it is defined in. 

  • The different types of SIP clients and servers

  • The structure of SIP messages

  • Overview of SIP response codes

  • The structure of the SIP URI

  • Overview of SIP headers and their purpose

  • How the Session Description Protocol (SDP) works

  • How SIP allows mobility through call forking, REFER requests and Diversions

  • The details of SIP transactions and Dialogs

  • How SIP proxies route requests (We discuss stateful and sateless proxies)

  • The SIP Trapezoid model

  • How SIP Registration works. 

  • How SIP Authentication works. We dive into how the MD5 hash is created. 

  • What challenges SIP faces with NAT and how to overcome them.

  • An overview of the Real Time Protocol - AKA RTP

This course is created for: 

  • IT Generalists wanting to learn a specialized skill.

  • Technical support staff working for a VOIP provider

  • Service Delivery staff that deploys VOIP networks for customers. 

  • Voice Engineers that want to increase their knowledge on SIP.

  • Central Office Engineers that need to learn SIP while they transition away from circuit switched networks. 

  • Sales Engineers that want to close more deals.

About the Instructor :  

Keith Croxford has been involved in VOIP and networking technologies for over 14 years. He has received accolades from VOIP industry experts. Here are a few examples : 

"Keith is one of those rare engineering breeds that is exceptional in knowledge and communicating that knowledge. It is a great team player and has assisted in resolving hard issues that no one else can fix. Keith is intelligent, detailed, self disciplined, works well with others, and great at documentation. When it comes to voice engineering, there has never been a better one." - CTO

"Keith is the Swiss Army of knife of VOIP and Data networking technologies with a healthy dose of great Programming skills and Customer Experience management. It is very tough to find a Jack of All Trades and a Master of a Few and Keith is one of them. I've interacted with him in deeply technical and business related circumstances and he hits the ball out of the park in both. His work ethic is second to none. He also demonstrates a very high entrepreneur mindset." - Director of Service Delivery 

Start Learning Now!

This same material is presented in live conferences that cost $400 per seat to attend. Through Udemy you are able to receive this course at an incredible value.

Click on "Take this course" and start learning now. 

Who this course is for:
  • This course is best suited for technical support engineers that want to advance their career.
  • This course is not for someone wanting to learn about Cisco Call Manager
  • This course is not for someone wanting to learn about any specific vendor's SIP stack
Course content
Expand all 27 lectures 03:51:58
+ General SIP Overview
1 lecture 07:14

In this module you will learn about SIP, the RFCs that define it and where SIP resides in the OSI model. 

Preview 07:14
What is SIP?
2 questions
+ SIP Clients and Server
1 lecture 07:50
What is the difference between a SIP Client and SIP Server?
+ SIP Messages
14 lectures 01:45:26
What does a SIP message look like?
What is a SIP response code?
1XX Response Codes
2xx - 3xx Response Codes
Wireshark Review - Examine a 2xx response
200 OK Capture quiz
1 question
4xx Response Codes
5xx Response Codes
6xx Response Codes
What is a SIP URI and how is it structured?
How is a SIP header structured?
What is an SDP and how does it affect media?
How does SIP allow user mobility?
+ SIP Routing and Responses
3 lectures 28:02
Why are SIP transactions and dialogs important?
How does SIP Route calls?
The SIP trapezoid model.
+ Registration
1 lecture 11:00
How does SIP registration work?
+ The problem with NAT
1 lecture 14:35
What challenges does SIP face with NAT?
+ Media and RTP
1 lecture 11:11
Overview of the Real Time Protocol
+ Using Wireshark to Capture and Troubleshoot SIP
3 lectures 23:59
Overview of capturing SIP traffic

Watch this to see how easy it is to install Wireshark. I install on OSX in this video. Linux and Windows are just as easy. 

Installing Wireshark
General Wireshark options and starting your first capture.