---
title: "Calltower Information - Telecom Acronyms"
slug: "calltower-information-telecom-acronyms"
tags: ["calltower", "public"]
updated: 2026-07-27T14:09:11Z
published: 2026-07-27T14:09:11Z
canonical: "learn.calltower.com/calltower-information-telecom-acronyms"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://learn.calltower.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Calltower Information - Telecom Acronyms

## Summary:

Below is CallTower's guide to Telecom acronyums. The guide will provide a "Standard" description and then a "Description that makes sense." This will allow you to know how the acronyum is worded in the industry and worded as you explain it to your kid.

PSTN">

## PSTN

![PSTN.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/PSTN.jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A52%3A27Z&se=2026-11-04T23%3A52%3A27Z&sr=c&sp=r&sig=HLz1n2xgAGaHc2gRkTowFNPZooL8wCuQX8oASVcolzA%3D)

## VOIP

![voip.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/voip.jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A52%3A27Z&se=2026-11-04T23%3A52%3A27Z&sr=c&sp=r&sig=HLz1n2xgAGaHc2gRkTowFNPZooL8wCuQX8oASVcolzA%3D)

SIP">

## SIP

![sip.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/sip.jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A52%3A27Z&se=2026-11-04T23%3A52%3A27Z&sr=c&sp=r&sig=HLz1n2xgAGaHc2gRkTowFNPZooL8wCuQX8oASVcolzA%3D)

## VPN

![vpn.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/vpn.jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A52%3A27Z&se=2026-11-04T23%3A52%3A27Z&sr=c&sp=r&sig=HLz1n2xgAGaHc2gRkTowFNPZooL8wCuQX8oASVcolzA%3D)

## SD-WAN

![SD WAN.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/SD_WAN.jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A52%3A27Z&se=2026-11-04T23%3A52%3A27Z&sr=c&sp=r&sig=HLz1n2xgAGaHc2gRkTowFNPZooL8wCuQX8oASVcolzA%3D)

Telecommunications, the transmission of information over significant distances by electronic means.

Public Switched Telephone Network, the traditional circuit-switched telephone network used for voice communication.

Session Initiation Protocol, is the technology that starts, manages, and ends internet-based phone calls and video meetings between people and devices.