95% off How to launch your first succesful Udemy course! (Coupon)

Attention: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission at no extra cost to you. Thanks!

How to launch your first succesful Udemy course! - Udemy Coupon

Get Discount


Bonus: download a free guide that reveals 11 tricks for getting the biggest discounts on Udemy courses, including this course.

Coupon & course info

Course Name: How to launch your first succesful Udemy course!

Subtitle: Learn how to start making sales in your first week.

Instructor: Taught by Keith Croxford, VOIP Expert and Social Engineer

Category: Teacher Training

Subcategory: Other

Provided by: Udemy

Price: $20 (before discount)

Free coupon code: See above (no charge for coupon)

Review info & popularity

As of September 8, 2016…

Students: 1232 students enrolled

Ratings: 10 reviews

Rank: ranked #28d in Udemy Teacher Training Courses

Brief course description

Are you in the process of creating a Udemy course? Maybe you have created a course, but you aren’t seeing the signups you expected? Does that frustrate you?

If so you need to learn the secret to earning your first $100 on Udemy.

My Story

(Read more about this course on the official course page.)

Keith Croxford bio

Over the past 14 years I have been involved in information technology. 10 years of this has been focused on carrier / ISP voice and data networks. I’ve built networks from the ground up. Literally. I’ve worked on everything from outside plant (the wires in the ground) to the devices that deliver VOIP services to your home or business.

(Learn more about this instructor on the official course page.)

Recommended courses

If you like this course, you might also be interested in:


1. Udemy Course Creation & Marketing Masterclass – Unofficial

Learn Udemy Course Creation from A – Z and boost income with Udemy’s marketing tools!

Taught by Paul Hill, Expert IT Instructor: 1k+ Reviews, 5 Courses, 15k+ Students


2. Online Teaching 101: Seven ways to increase your hourly rate

Learn how to work less hours, maintain your effectiveness and earn more money while teaching online

Taught by Dr. Rochelle Franklin, Online Education Specialist


3. Moodle 3.x Masterclass: Complete Educator’s Guide to Moodle!

Moodle Tutorial for Educators – Learn Moodle to create WORLD CLASS online courses. Leverage Moodle 3 like a BOSS!

Taught by Srikanth Shirodkar, Senior Manager at a Learning Tech Co


4. The Top 10 Reasons To Teach On Udemy (Unofficial)

What Makes Udemy One of the Best Platforms For Online Teaching (Unofficial)

Taught by Lilia Fallgatter, JD, Writer, Publisher, Author, Speaker, Educator


5. Adobe Audition CC Course: Audio Recording & Post Processing

Remove background noise and echo in home Audio recording with Adobe Audition CC: Improve Voice Over Recording Quality

Taught by Arun Nagarathanam, SEO, WordPress, ECommerce, PowerPoint Instructor

Final details for this Udemy course

Languages: English

Skill level: Beginner Level

Lectures: 12 lessons

Duration: 1 hour of video

What you get: Know the secret to generating sales on Udemy

Target audience: This course if for motivated Udemy instructors that want to create a passive income from their course.

Requirements: Have a pen and paper ready

Access: Lifetime access

Peace of mind: 30 day money back guarantee

Availability: available online, as well as on iOS and Android

Download options: check course to see if you can download lessons

95% off The Foundations of SIP (Coupon & Review)

Attention: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission at no extra cost to you. Thanks!

The Foundations of SIP - Udemy Coupon

Get Discount


This is the best Udemy The Foundations of SIP coupon code discount for 2024.

So if you’re interested in Keith Croxford’s “The Foundations of SIP” course, which will help you increase your IT & Software skills, get your discount on this Udemy online course up above while it’s still available. (The coupon code will be instantly applied.)

The Foundations of SIP review for 2024

In our review of this course, we try to help you answer all of your most important questions about The Foundations of SIP as quickly and efficiently as possible, so that you can determine whether this online education training is worth your time and money.

Feel free to jump to whatever question you want answered the most.

Here’s what you’ll learn:

Why use TFOS as an abbreviation of the course name?

During our The Foundations of SIP course review, you might sometimes see us refer to it as TFOS for the following 2 reasons:

  1. We created the acronym by taking the first letter of every word (which was very ingenious and innovative, we know)
  2. We’re lazy and TFOS is simpler and easier for reviewing purposes

The full course name is 22 characters long, including blanks, while TFOS is 4 characters long.

You do the math.

Okay, we’ll do the math. We’re saving 18 characters every time we use TFOS.

So, just a heads up that we’ll be using this abbreviation sometimes, so you’re not left scratching your head and wondering what the heck we’re talking about whenever we refer to TFOS throughout the remainder of this review.

Is the The Foundations of SIP course for you?

To determine whether Keith Croxford’s Udemy course is a good fit for you or not, ask yourself the following questions down below.

The more you answer “yes” to each question, the more likely it is that you’ll like this course.

Can you understand what Keith Croxford’s course is about in 30 seconds or less?

Hopefully, you can easily grasp in 10 seconds or less what this online course is about simply by taking a look at the title that Keith Croxford chose for the course, “The Foundations of SIP”, as well as its subtitle: “Learn the fundamentals of SIP to advance your VoIP career.”.

This combo of title and subtitle should be enough to communicate the purpose of the training if Keith Croxford is a good, clear communicator (which, of course, you want in a teacher).

In our opinion, if you still don’t know what TFOS is about after looking at these two things, then this is a red flag, and you might be better off not taking this class.

Among other things, it means Keith Croxford hasn’t clearly and accurately conveyed what the course is about and might not be the best teacher for you.

For similar reasons, it’s important that you’re able to clearly understand what The Foundations of SIP is all about from the first few lines of the course description.

So take just a few seconds to read the opening lines down below and see what you think of them. 

Opening lines of Keith Croxford’s official description of TFOS

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:

(Read more about this course on the official course page.)

Does TFOS pass the 30 Seconds Test?

You can read a lot more about The Foundations of SIP on the official course page on Udemy, but the point is this: are the title, subtitle, and just the first few lines of the description enough to help you understand what the course is about?

If so, Keith Croxford has done a good job and can be considered more trustworthy and a good communicator, which are important qualities for any teacher.

And, if not, maybe you’re better off looking at other IT & Software classes that are more clearly defined and more tailored to your specific interests.

Did The Foundations of SIP appeal to you in 30 seconds or less?

Now that you’ve done the 30 Second Test with TFOS above, what is your gut reaction to this IT & Software course with only the basic information of its title, subtitle, and the first few opening lines of its official course summary?

Did Keith Croxford do a good job conveying its subject matter, and did it immediately get your attention and appeal to you?

If so, Keith Croxford’s online course is certainly worth considering some more.

But if not, perhaps it’s in your best interest to consider some other IT & Software courses instead, because clear communication and being able to hook and maintain your interest are two very important qualities for your online learning success.

Does Keith Croxford sound like a course instructor you’d like to learn from?

You’ve already learned how to use The 30 Second Test to make a quick evaluation of whether the TFOS course is worth taking.

We have a similar 15 Second Bio Test where you read only the first few lines of an instructor’s background — in this case, Keith Croxford’s background — and then you make a quick, snap judgment as to whether you think the instructor would be ideal for you.

There is no right or wrong answer. It’s just about going with your gut instinct. What might appeal to one potential student might alienate another, and vice versa.

(FYI, all Udemy instructors, including Keith Croxford, have a Udemy profile on their course page, so you can easily check for a bio and background on the Udemy website that way. We’re only including the first few lines of the bio down below for The 15 Second Bio Test).

Opening lines from Keith Croxford’s Udemy bio

Over the past 14 years I have been involved in information technology. 10 years of this has been focused on carrier / ISP voice and data networks.  I’ve built networks from the ground up. Literally.  I’ve worked on everything from outside plant (the wires in the ground) to the devices that deliver VOIP services to your home or business.

(Learn more about this instructor on the official course page.)

What did you think about Keith Croxford after reading just the first few lines of the bio above?

After reading just the first few lines about Keith Croxford, did it make you more or less interested in taking the TFOS course?

And did it make you feel like Keith Croxford was more or less credible and qualified to teach The Foundations of SIP?

Finally, overall, did you feel like you’d receive the proper training from the instructor of this IT & Software course?

As always, we encourage you to listen to your gut instinct, which is different for every student.

Are the TFOS lessons clear, specific, and organized well?

Part of the (good) problem with Udemy’s online courses, such as the The Foundations of SIP course, is that the instructors are constantly updating them, including adding and renaming lessons.

So it makes no sense whatsoever for us to list out all the modules and lessons in the TFOS course here, because you can just as easily go to the Udemy course page and get all the up to date course structure as of right now.

We do, however, have some tips about reviewing Keith Croxford’s course structure, so that you can get a better sense of whether this program is worth your time or not.

In a nutshell, you want to scan the the titles of the different sections and lessons of the course, and verify that they are clearly relevant to the course’s name, The Foundations of SIP, as well as the course’s subtitle, Learn the fundamentals of SIP to advance your VoIP career..

If the section names and lessons are clear, specific, and relevant, then it’s a good sign that TFOS is potentially a good, useful course for you, and you can have more confidence in Keith Croxford’s teaching abilities and lesson planning.

On the other hand, if the module names are confusing, vague, or irrelevant, then this is a red flag, which might indicate that the program is worth skipping.

Have you taken some free lessons from Keith Croxford that you enjoyed?

Have you already learned something from Keith Croxford that you valued or enjoyed?

For example, does the The Foundations of SIP training have some free lessons that you can try? (Almost all Udemy instructors will give you at least one or two lessons for free to help you make a better, more informed decision before enrolling in their course.)

But if you weren’t able to get any TFOS lessons for free, have you perhaps watched a YouTube video by Keith Croxford, or perhaps come across this instructor’s thoughts on Quora, Facebook, LinkedIn, Github, Reddit, or some other platform?

Or have you perhaps even taken one of Keith Croxford’s free courses or free webinars? (Many online teachers offer these freebies, which is a great way to get to know them and evaluate their teaching methods before buying one of their courses.)

In any case, the more familiar you are with Keith Croxford’s teaching methods, and the more you enjoy them, the more likely it is that The Foundations of SIP will be a good fit for you.

(P.S.: We strongly encourage you to seek out some free instruction from Keith Croxford before purchasing this course, since it’s one of the best ways to determine whether TFOS will be helpful for you.)

Are “The Foundations of SIP” reviews generally positive?

On the bottom of the TFOS page, you can read student reviews of the class.

Prior to March 29, 2024, there were 1,122 students enrolled, 509 reviews / ratings, and it was overall rated 4.5 out of 5.

Obviously, the more highly other students rate TFOS the better, but no matter what, keep an open mind when reading the reviews, since you might still like a course a great deal that other students dislike.

After all, everyone’s got their own opinion.

We recommend that you spend only a couple minutes scanning the TFOS reviews to get an overall sense of them. You don’t have to read each one!

Is Keith Croxford responsive to student questions in the TFOS training?

You can see what other students have to say about this in their TFOS reviews.

But, our simple all time favorite way of gauging an instructor’s responsiveness is to simply email the instructor and see if or how they respond.

In this case, Udemy has a messaging system for students / anyone who has an account, and you can send Keith Croxford a message through this system quite easily, even if you haven’t bought TFOS yet.

For example, you could say, “Hi, and I came across TFOS while looking at IT & Software courses on Udemy. If I enroll in your training, would you mind if I asked you any questions along the way?”

If you use this approach, the response (or lack of response) from the professor will tell you everything.

Obviously, the quicker the response the better!

Are you comfortable going through the lessons in The Foundations of SIP on your own, online?

This is a big one, because The Foundations of SIP is an online course as opposed to a course that you physically take in a classroom.

Of course, you will need a good internet connection to have access to the course material and lessons, but beyond that, you also have to be comfortable being self motivated to some degree, being on your own, and not having any physical interaction with any of the other students taking The Foundations of SIP.

Yes, you will be able to interact with the students and the teacher, Keith Croxford, online, but it’s a different kind of experience than what you’d get if you were interacting with them in person.

This is not a big deal to most people, but it might be something for you to consider if you feel like you do better taking classes in person rather than learning online.

Do the pros / benefits of TFOS make it worth your time?

Ideally, if you’ve gone through the evaluation steps above, you have a list of positive things about the The Foundations of SIP training that looks something like this:

  • The purpose of TFOS can be clearly grasped and understood, and its lesson structure is clear, specific, and well organized
  • Keith Croxford is well qualified to teach this subject matter, has good teaching abilities, and is responsive to student questions
  • Other TFOS students have great things to say about the program

Other benefits include:

  • You get to go through TFOS at your own pace
  • You join a community of 1,122 other students taking the course
  • You get lifetime access to the training
  • All updates to the training are free
  • You have a 30 day money back guarantee

Even if there are some things that you don’t like about the program, so what?

The question is simply this: do you think that TFOS would be worth your time, even if there are some things that could be better about it?

Can you comfortably afford TFOS?

Can you comfortably afford the cost of The Foundations of SIP?

This is an important question to answer, because even if you think TFOS sounds like the greatest online class in the world, it’s still not worth taking if you can’t comfortably afford it!

Before March 29, 2024, the price was $14.99 before any Udemy discount, and you were able to pay with a credit card.

Keep in mind that this is a Udemy online course, and there’s a great chance that you can get a solid discount on TFOS with Udemy coupons / promo codes, especially with the strategies we provide for helping you find the best, most popular coupons available.

We’ll cover that in greater detail in the next section, because at the end of the day, its important that you can learn whatever you want to learn without getting into a lot of credit card debt.

How can you maximize your discount on The Foundations of SIP?

By far, the easiest way to get the best and biggest discount on this course is to use the The Foundations of SIP discount code link at the top of this page.

It will instantly give you the best coupon code we could find for Keith Croxford’s online training.

We don’t believe there’s a bigger discount than the one we provided, but if for some reason you’d like to try find one, you can use the methods below to hunt for the best TFOS course coupons and promo codes you can find.

FYI, the methods below will help you not just with getting TFOS for a better price, but also with any other Keith Croxford Udemy course that you’d like to get for cheaper.

How can Google help you get a TFOS discount?

To use this method, do a Google search for the TFOS training, but in your search query, be sure to add words like coupon code, promo code, deal, sale, discount, and Udemy.

For example, you might do a search for “Udemy The Foundations of SIP promo code” or “The Foundations of SIP udemy coupon codes” and see what turns up.

Similarly, you can use the same combination of search terms with Keith Croxford’s name and see what happens.

For example, you might do a Google search for “Keith Croxford Udemy coupons” or “Keith Croxford course coupon codes” and see if that helps you.

However, in general, it’s far more powerful to do a search for deals and coupon codes with the actual training’s name, than with the instructor’s name.

So in this case, for example, prioritize searches for “The Foundations of SIP coupons” rather than “Keith Croxford coupons”.

How can a Udemy sale get you TFOS for cheaper?

Every once in while, Udemy will do a sitewide sale where they offer all (or almost all) their courses at a discounted price. For example, one of the best sales is where every course is only $10 or $9.99.

So, if you’re interested in saving as much money as possible, you could wait and see if you can get TFOS for this cheaper Udemy sale price one day.

The problem is that these sales only occur sporadically, so you might be waiting for a while. Also, if Keith Croxford decides not to participate in the site wide sale, then you won’t get a discount on TFOS, even though you could get a great discount on almost any other class at Udemy!

To understand this, think of there as being two different coupon categories for the TFOS course. Category one is an official Udemy coupon (which instructors can opt out of), while category two is a coupon offered directly by the instructor.

At the end of the day, it doesn’t matter what kind of a coupon tag you’re dealing with (for example, “officially from Udemy” or “officially from the instructor”), as long as long as as you’re dealing with active coupons that get you a better price.

How can you get a TFOS discount from Keith Croxford?

If you’re really serious about getting “The Foundations of SIP” for the cheapest price possible, then perhaps one of the most powerful things you can do is get a coupon code straight from Keith Croxford, instead of waiting for a Udemy sale.

To do this, you can use either the direct approach or an indirect approach to try to get your discount.

With the direct approach, the big idea is to simply get Keith Croxford’s contact info in some way or another (whether it’s email, or Twitter, or whatever else).

Then you send a message saying something like “I’m interested in enrolling in The Foundations of SIP. Do you happen to currently have an active coupon code for it that I could use?” (And then, hopefully, you’ll get a reply with your discount code.)

On the other hand, with the indirect approach, you join Keith Croxford’s mailing list, if you can find it, and then you hope that at some time TFOS will be promoted to you at a discount.

By far, the more powerful approach is the direct approach, because it tends to get results faster. But you can experiment with the indirect approach and see if it works for you.

Can you get TFOS for free?

Of course, the best possible price for the TFOS training is free! As in, you pay no money whatsoever.

And guess what? Sometimes Udemy instructors provide coupon codes that enable students to take their courses for free. So, perhaps it’s possible that Keith Croxford has done this.

Basically, if you’re trying to get this program for free, you will want to search for the course’s name along with other words like free coupon, or 100 off coupon.

For example, you might do a google search for “The Foundations of SIP free coupon” or “The Foundations of SIP 100 off coupon” and see what happens.

But keep this in mind: often, Udemy teachers will offer a free coupon for their course when it first opens to get some publicity and reviews. And then, after a few days, they’ll make the coupon expired.

So even Keith Croxford has offered free coupons for TFOS in the past, the odds are likely they will all be currently expired. This is a common pattern that we have found.

What about a TFOS free download?

It’s important to understand that there’s a difference between getting full access to the TFOS training for free legally with a free coupon code vs. finding a way to download TFOS illegally.

If you really want to go the download route, you can do a google search for something like “The Foundations of SIP download”.

And if that doesn’t get you the results you want, you can add the word “free” to your search.

For example, perhaps you could do a google search for “The Foundations of SIP free download”.

However, even if you get some results from these searches, we do not recommend that you take this course of action.

First of all, there are some shady sites out there that could be trying to infect your computer.

Second, Keith Croxford created this course and deserves monetary compensation for it.

And third, if you go the free download route, you’ll be missing out on a lot of value, because you won’t be able to ask the instructor questions or interact with the other 1,122 students enrolled in the program.

Can you get a refund on The Foundations of SIP if you don’t like it?

Let’s say that you used our tips above, and you were able to buy the TFOS training at a fantastic discounted price. So at this point, you’re super excited.

Then, you actually dive into Keith Croxford’s course, and you discover that it just isn’t for you for whatever reason.

And now you’re super bummed, because you feel like it wasn’t money well spent.

Well, guess what?

Udemy offers a rock solid 30 day money back guarantee on all their courses, so you can get a refund on TFOS no matter what. And this means there is absolutely no risk.

Indeed, even if you left a super negative, critical review on the TFOS training, and then asked for your money back, you’d get a refund. For better or worse, there’s nothing Keith Croxford could do about it, since it is simply Udemy policy.

To sum it up: yes, you can get a full refund, so at the end of the day, don’t worry about the possibility of purchasing TFOS and not liking it, since you can always get your money back.

What is OCP’s overall rating of The Foundations of SIP?

During this TFOS review, you’ve learned about some of the unusual ways we like to evaluate courses, such as with The 30 Second Test and The 15 Second Bio Test.

So our overall review process is perhaps a little unusual and different from other reviews out there. Keep this in mind when you consider the overall rating / score that we have given this course.

Anyway, after taking a look at the TFOS training, the instructor, Keith Croxford, and reading what other students have said about this program, we give it an overall rating of 4.9 out of 5.

Ultimately, though, what matters most is what you would rate it based on the same criteria.

What are some potential alternatives to The Foundations of SIP?

If you like this course, you might also be interested in:


1. RHCE Linux System Engineer Complete Course

RHCE Complete Linux Administration Course covering advanced Network, Storage

Taught by Linux and DevOps Engineer


2. Learn Vivado from Top to Bottom – Your Complete Guide

The complete guide for implementing designs on Xilinx FPGAs using Vivado Design Suite, for beginners and advanced users

Taught by Your Embedded Systems Guy


3. MTA 98-366 Network Fundamentals Class & Practice Exam Bundle

Everything you need to pass the Microsoft MTA 98-366 exam on your 1st attempt, includes 2 full-length practice exams!

Taught by Educator. Author. Poker Coach. IT & Business Professional.


4. Ansys Tutorial

Modelling and analysing composite model in Ansys Software

Taught by Researcher at Lancaster University


5. The Complete Penetration Testing Course: Beginner To Expert

Learn Penetration Testing The Right Way! Learn All The Ethical Hacking & Penetration Testing Techniques Used By Hackers

Taught by Penetration Tester & Security Researcher

TLDR: Just the quick facts about TFOS

Okay, if all of this was Too Long Didn’t Read for you, here is the Cliff’s Notes version of what TFOS’s online training is all about:

TFOS coupon & course info

Course Name: The Foundations of SIP

Subtitle: Learn the fundamentals of SIP to advance your VoIP career.

Instructor: Taught by Keith Croxford

Category: IT & Software

Subcategory: Network & Security

Provided by: Udemy

Price: $14.99 (before discount)

Free coupon code: Get Udemy coupon code discount at top of page (no charge for coupon, especially since we are compensated for referrals via affiliate marketing)

TFOS review info & popularity

Prior to March 29, 2024…

Students: 1,122 students enrolled

Ratings: 509 reviews

Rank: ranked #492 in Udemy IT & Software Courses in Udemy IT & Software Courses

Rankings tip: rankings change all the time, so even if The Foundations of SIP is a bestseller or one of the top Udemy courses one year, it doesn’t mean it will be a top Udemy course the next year

TFOS final details

Languages: English

Skill level: Beginner

Lectures: 27 lectures lectures lessons

Duration: 4 total hours hours of video

What you get: Pass SIP related questions in a job interview

Target audience: This course is best suited for technical support engineers that want to advance their career.

Requirements: You should have a general understanding of networking

Access: Lifetime access

Peace of mind: 30 day money back guarantee

Availability: available online, as well as on iOS and Android

Download options: check course to see if you can download lessons