---
title: Public Switched Telephone Network (PSTN)
description: What Is the PSTN? The Public Switched Telephone Network (PSTN) is one of the oldest telecommunication networks in the world, dating back over 150 years. It consists of a combination of copper-based lines and fiber-optic communication facilities that are publicly switched and interconnected in various configurations to form what is known as the public telephone network or public switched network.
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# Public Switched Telephone Network (PSTN)

 By [Revation Systems](https://blog.revation.com/common-contact-center-acronym-list/author/revation-systems)

[![Read More: Integrate with Popular Email and Directory Applications](https://no-cache.hubspot.com/cta/default/7904435/d92d08e3-41a3-4810-b5a4-557c7e4a6226.png)](https://cta-redirect.hubspot.com/cta/redirect/7904435/d92d08e3-41a3-4810-b5a4-557c7e4a6226)

---

What Is the PSTN? The Public Switched Telephone Network (PSTN) is one of the oldest telecommunication networks in the world, dating back over 150 years. It consists of a combination of copper-based lines and fiber-optic communication facilities that are publicly switched and interconnected in various configurations to form what is known as the public telephone network or public switched network.

---

[![Read More: Meet Service Level Agreements (SLAs) with Real-Time Contact Center Metrics](https://no-cache.hubspot.com/cta/default/7904435/96a66d6d-976c-4b14-b62c-7bf304355ecd.png)](https://cta-redirect.hubspot.com/cta/redirect/7904435/96a66d6d-976c-4b14-b62c-7bf304355ecd)

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