# Overview

**PortSIP PBX v16.x has entered maintenance mode.**

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This version is no longer under active feature development and now receives **security fixes only**.

We strongly recommend upgrading to the [latest PortSIP PBX v22.x](https://support.portsip.com/portsip-communications-solution/portsip-pbx-administration-guide/1-installation-of-the-portsip-pbx/installation-of-portsip-pbx-v22.x/upgrade-v16.x-to-the-latest-v22.x) to take full advantage of a modern, powerful, and all-in-one **Unified Communications** platform.

### Why Upgrade to PortSIP PBX v22.x?

PortSIP PBX v22.x delivers a next-generation AI-Powered communications solution designed for:

* **UCaaS, CCaaS, CPaaS, and Cloud PBX** deployments
* High-performance, multi-tenant service provider environments
* Modern collaboration and contact center use cases
* AI transcription
* CRM Integrations

With v22.x, you gain access to a rich set of advanced features and **beautiful, fully integrated client app** for:

* Windows
* macOS
* iOS
* Android
* Web
* Microsoft Teams Phone

These modern apps provide powerful calling, messaging, collaboration, and contact-center capabilities—helping your teams **stay connected, work efficiently, and remain productive from anywhere**.

### Summary

Upgrading to PortSIP PBX v22.x ensures you benefit from:

* Continuous feature innovation
* Enhanced security and performance
* A unified, future-proof communications platform

For the best experience and long-term support, please plan your upgrade to **PortSIP PBX v22.x** as soon as possible.