3CX - PSTN, ISDN or VoIP? – Part 1 - Geek Guru

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3CX – PSTN, ISDN or VoIP? – Part 1


Which type of line is right for your business? Stick with us over the next few posts as we go into a little detail about the various types of line available.


Telephony and its associated technology has come an amazingly long way since the American Bell Telephone Company introduced the first telephone exchange in 1877. It may be hard to believe that technology similar to that used such a long time ago is still being used for communications today – but in fact, it is.

All of our wired telephony systems stem from this one common ancestor, which used standard copper wiring and human operators to connect calls. Over the years, while the copper wiring has remained in some areas, computerised systems have been put in place to allow for much greater speed, accuracy and many more features. Many residential areas and some business areas still consist of a “local loop” that’s made from copper wire, connecting to a more technologically advanced “trunk” line at a nearby connection box.

Advances in telephony technology mean that users wanting to install a new telephone line have three main options:

  • PSTN – Public Switched Telephone Network (also known as POTS or Plain Old Telephone Service).
  • ISDN – Integrated Services Digital Network.
  • VoIP – Voice over Internet Protocol.

The type of line (or lines) you’ll need really depends on how much your business communicates via telephone, and how many external lines you need.

The great thing is that with a 3CX IP-PBX System from Geek Guru, you can operate as many or as few of these as you like, together as one phone system, through the use of a wonderful little box known as a Gateway. As one of 3CX’s Certified Partners, we are able to provide, install and support all of the equipment necessary, (including extras like the gateways,) at the high standard you’d expect from us.

Whatever you decide on, or if you need help deciding, or have made your decision and need advice or to take the next step, we’ll help you as much as we can and provide ongoing support, usually through one of our value-added support plans.

Over the next few posts we’ll be going through the different line types, explaining the technology they use, their advantages and disadvantages, and what this can mean for different sizes and types of business.


If you’d like to discuss 3CX Systems, VoIP, ISDN or anything else IT or tech-related with us, give us a call and we’ll be happy to help you in any way we can!

Call us on 0845 234 0580 or email us at info@geek-guru.co.uk

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Posted on by Emily
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