SIP Trunk Configuration Instruction with FreePBX Example Configuration provides you with a step by step SIP Trunk Configuration of ProSbc with FreePBX systems, using the Web Portal configuration tool. Complete general installation configuration steps, before you begin configuring your specific scenario. In this guide FQDN (freepbx.telcobridges.com) configured in the FreePBX server. If you don't use FQDN, you can use FreePBX IP address too. Please check how to configure the SIP Trunk in FreePBX for ProSBC from FreePBX Trunk Creation