# Certificates for TLS/HTTPS/WebRTC

This guide explains how to resolve common SSL/TLS certificate issues when using PortSIP PBX and PortSIP SBC.

After completing the PBX and SBC setup, you may encounter a self-signed certificate warning in the following scenarios:

* When accessing the PBX Web Portal over HTTPS
* When using the WebRTC client in a web browser

In addition, this guide applies if your existing SSL/TLS certificates have expired and need to be renewed or replaced.

Follow the steps in this guide to install trusted certificates and eliminate browser security warnings.

This article includes the following topics.

* [Using a Free Let's Encrypt SSL Certificates](/portsip-communications-solution/tutorials/certificates-for-tls-https-webrtc/using-a-free-lets-encrypt-certificate.md)
* [Preparing TLS Certificates](/portsip-communications-solution/tutorials/certificates-for-tls-https-webrtc/preparing-tls-certificates.md)
* [Update Certificates](/portsip-communications-solution/tutorials/certificates-for-tls-https-webrtc/update-certificates.md)


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