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Now that I am working with some friends, I have been asked to teach them how to deal with the command line to do some basic troubleshooting. To accomplish this, I believe the first step is the understanding of the main elements of a FusionPBX server and how they interact with them. So here it is.

Please note that this article is agnostic of having a stand-alone server or a cluster deployment.

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Usually, you will find that when talking about PBXes, they are classified in Class 4 and Class 5. So, obviously, your next question is: What is the difference between a Class 4 and a Class 5 PBX?  I will try to explain as clear as possible.

Class 5

A Class 5 PBX deals with end-user. It provides final-user services such as Voice-Mails, Conference rooms, IVR and many another kind of services that a phone user may need. This kind of switches deals with the user interaction (SIP endpoints such as Soft/Hard phones). So, in general terms, you can state that principal client of a Class 5 PBX is end-user.

It is very common to find them in the retail market.

Class 4

Class 4 PBX is a little different. They don't deal with end-user, but instead, they deal with other switches. If you are familiar with networking, you can see Class 4 switch as a router that is connected to other routers. Class 4 ones do not offer conference rooms, IVR or any other endpoint item; authentication is usually tied to IP rather than registration.

You can find this kind of switches on the wholesale market.

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When you visit for the first time a website, your browser downloads many files (images, styles, javascript and much more) we are going to call objects. In a misconfigured website, any object will be downloaded again and again each time you visit a page on that site. If you think a little, this harms your SEO ranking. Google will reward faster websites.

Since a while, the modern web browser has what it is called the cache. A web browser cache is just space on your computer where you store your latest object if those objects are requested your computer won't need to download them again, instead, it gets from the cache; local storage will be always faster than downloading from the Internet. Now think on your website, and think on all the CSS, JS and image files you are using (GIF, JPEG, PNG, WEBP, etc.); imagine all the time that can be saved when your guesses visit the second page on your website.

Apache has a very nice feature (turned off by default), that compresses the content of the page. Instead of sending the raw HTML file, it does a gzip or deflate compression and it sends a smaller file. It is faster to load a 2 kB file than a 10 kB. And as a consequence, this improves your loading time.

Again, don't forget  that Google rewards fastest websites, in other words, it improves your SEO.

In this post, I'm going to show you how to configure the .htaccess file to maximize local cache utilization.