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Service Network

Our service delivery network ensures that you have the highest reliability and connectivity. This document outlines the details of our network along with IP address records for advanced use case scenarios or specific firewall filtering situations.


We have four datacenter locations across the United States for a highly reliable, redundant, and scalable system. If one region goes offline your connection will reroute to another location automatically. You don’t have to worry about a local power outage or an ISP (Internet Service Provider) outage affecting your calls either. The softphone application integration allows you to continue using the system without interruption. In addition, the Prysm Voice platform includes intelligence to determine if any of your phones disconnect and will route incoming calls to a predefined destination such as another user, voicemail box, auto attendant, call queue, or external number.

United States map illustrating service network in Atlanta, GA

As a general matter, you will not need to do anything with these IP addresses, because the provisioning servers will take care of SIP Device configuration. We will provide you with domain names that will resolve to these servers as necessary.

IP Addresses for Voice Services

Ensure that traffic is allowed from the following IP addresses

  • – SIP servers for ATL cluster
  • – SIP servers for LAS cluster
  • – SIP servers for GRR cluster

IP Addresses for Additional Services

  • – Native Fax Server
  • – Provisioning Server
  •,, – Web & API

TCP and UDP Ports

The following TCP and UDP ports are in use by the system

  • TCP ports 80 and 443 (for web UIs and provisioning servers)
  • TCP & UDP port 5060 (for SIP signaling)
  • UDP port 8889 (for Web Meetings and Video Conferences)
  • UDP ports 20000-37999 (for RTP)
  • TCP ports 8001 and 9002 (Web Phones and Portal Updates)
  • TCP port 8000 (Auto-Attendant Text-To-Speech audio) 
  • UDP port 9999 (Auto-Attendant Text-To-Speech audio)
Updated on September 29, 2023

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