# Installation Requirements

Before installing and using TeamsPhone Plugin, verify that the vtenext environment meets the requirements listed below.

### Supported vtenext versions

TeamsPhone Plugin is supported on vtenext versions from **24.08.x** up to **26.x**.

> Versions later than 26.x are not currently supported.

### HTTPS connection

The vtenext instance must be reachable through a valid **HTTPS connection**. The SSL/TLS certificate must be correctly installed and trusted by the devices and services that use the plugin.

### Plugin licence

An **active licence** associated with the specific vtenext instance is required to use TeamsPhone Plugin.

### Administrative permissions

Installation and initial configuration require a user with administrative permissions in vtenext. Microsoft Teams tenant administrator permissions are also required to configure PSTN call notifications.