Introduction to Voice over IP (Part 1)

A lot of guides for voice and video assume you already know the basics. So, here, we’re going to cover this to get you going faster. Let’s start with a little history...

Phone calls used to use a switchboard in a telephone exchange. Over time, these became a much smaller device called a PBX or PABX. Copper phone lines (PSTN) would connect, and it would route calls. Eventually, we started adding digital ISDN lines.

After a while, phone and data networks were combined. This was the birth of Voice over IP (VoIP). The heart of this is the IP PBX, which manages calls. Calls come in over PSTN, ISDN, or SIP Trunk. There can be a phone on every desk, or even a softphone (a software phone running on your laptop).

A simple phone system has a PBX, a SIP trunk to a provider, one or more switches, phones, and a DHCP server. The switches power up the phones with PoE, and provide network information with CDP or LLDP. The DHCP server gives the phone an IP, and tells it how to find the PBX.

Overview of this video:

0:00 Introduction

0:26 From Analogue to Digital

2:56 Unified Communications

6:52 A Simple Phone System

Further Reading:
What is a PBX Phone System and How Does it Work?

PBX vs PABX: Is there Really a Difference?

What is DID?

What is a SIP Server, and How Does it Work?

How it Works - SIP Trunking

SIP Trunking Explained

LET'S CONNECT

#NetworkDirection
#networking
#voip

[NetworkDirection]

Thanks for watching!
More useful links in the description

[YouGenom]

Finally, someone knows the topic thoroughly and explains from A-Z. Thank you!

[HUCERBH]

this, please don't stop this series, i wanted to go in voice for so long this will be my starter, thanks

[Voipbusinesshq]

VoIP is an advanced phone system offering flexibility, cost effectiveness, and many other benefits. It is essential for businesses to understand how it works so that they can make decision whether they need to shift to VoIP or not. This video is well explained n this aspect.

[EJCLizP]

Thank you! I've been looking at setting up a simple VoIP system for very small business and everything is very technical and assumes a lot of prior knowledge. This is a great breakdown.

[knot]

Your videos are why I got into networking. Keep it up

[daveiooo]

Great video! Super useful for me to bridge a bunch of different articles on different VoIP concepts. Thank you

[ADJ]

Amazing video. Please keep making more informative videos man. Thank you!

[lawnboyfreak]

Great information. Everything is laid out well.

[admiralfang]

Thank you for sharing your knowledge i will never forget this deed even if you get money and fame from it

[haingseang]

thanks for your sharing. Your video pretty cool.

[kenbritzman]

I wish to start a bpo in the future
Can my team overseas use a soft phone application ( laptops) and connect to my PBX in Australia where I live?

[midimusicforever]

Can just anyone connect their PBX server to the "regular" phone lines?