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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.

Read more: Configure your .htaccess file for a better SEO

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An inverse proxy is a device that it is between your browser and the final web server. As the name says, it works in the inverse way a common proxy does. The main goals of an inverse proxy are to speed up and bring security. Because they don't hold the content, they only take care of some matters such as:

  • Caching: inverse proxies can offload your main HTTP servers by frequently serving static content.
  • Load balancing: you can have a farm of HTTP servers, and your inverse proxy will do the load balancing among them.
  • Anti-DoS: inverse proxies are designed to manage a high load of TCP connections. Therefore, with the right configuration, they are the first line of defense for DoS attacks.
  • Authentication (if applies): you can add security layers to your application.
  • Content alteration: you can change something without touching your WEB application.

In this article, I am going to focus on the Caching. As the title says, we are enhancing the SEO ranking.

Read more: Improve your SEO ranking by Configuring an Inverse Proxy

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