The #1 Choice of Broadcasters for Audio over the Public Internet


APT SureStream Technology is a revolutionary innovation from APT that enables broadcasters to use inexpensive IP links and still maintain professional broadcast-grade audio quality and reliability.  It delivers the audio quality and reliability you expect from a T1/E1 link at a fraction of the associated cost.

APT SureStream Technology also offers the added benefit of «Always-On Redundancy». With APT SureStream technology, you can save thousands on your audio transport bills and still offer your listeners the highest quality sound.


  • Save Money: You can save up to 90% on the cost of your audio transport bills by replacing your synchronous or managed IP Links with the public internet. With DSL charges typically costing from 5-10% that of a synchronous link, the potential savings are so significant that it is possible to achieve a return on your investment in under 4 months!
  • Deliver High Quality Audio: The audio quality of your station should not be sacrificed for the sake of cost savings. SureStream enables you to maintain consistently high audio quality with no drop-outs and no jitter. 
  • Keep Delay Consistent : For professional audio delivery, it is not acceptable for the signal delay to vary or to drift. The ability to maintain the delay at a consistent level is particularly useful for remote broadcast applications and local content insertion. 
  • Relax! SureStream offers you the same level of uptime and reliability as a ‘five nines’  Telco service. You are protected not only from drop-outs and glitches but also from a complete loss of connection!


At a basic level, SureStream is based on Redundant Streaming technology but SureStream offers much more than just duplicate streams.

SureStream employs a number of proprietary techniques that optimize the delivery of all streams throughout the network and an advanced resequencing engine that produces one perfectly seamless, reconstructed stream from the multiple streams received. Perfect audio from an imperfect network!

SureStream works well on a single IP link for impromptu remotes or outside broadcasts but, for mission-critical studio transmitter links and audio contribution or distribution, we recommend utilizing two links from different providers to ensure optimum performance rivalling the a traditional T1 service.


SureStream Dual Port Configuration
user report

User report

"SureStream technology has made possible something that was conventionally assumed to be impossible: having a high quality, real-time audio link over the open Internet."

Dan Houg, Chief Engineer, Northern Community Radio, USA

user report

User report

"Despite the poor quality of the internet connections available, the project was able to proceed with high quality audio, very workable latency and with connections that cost a fraction of what we would have spent on satellite."
John Pearce, Technology Manager, Nova Entertainment,  Sydney, Australia

user report

User report

"since we activated SureStream, these internet issues have no impact on our broadcast audio and we don’t experience any interruptions or drop-outs

By Charles de Wolbock, Technical Manager, Radio Fidélité, Nantes

user report

User report

"I would absolutely recommend the APT IP Codec as the new generation of audio codecs! I do not compromise on the quality I bring to the client and that is the reason I use the APT IP Codec with SureStream technology for my audio distribution. It works, it’s as simple as that!”

Oliver Schitz, Voice Talent, Germany

Order information

CD00123APT SureStream Technology - APT IP CODEC
CD00136APT SureStream Technology for AoIP MODULE - APT FRAME 1U
CD00137APT SureStream Technology for AoIP MODULE - Oslo 3U
CD00124SureStream for Oslo 3U IP Card
Cool Stuff Award Radio World 2011
Pick Hit Radio 2011




  • Learn how APT's SureStream technology works & the advantages it brings to your AoIP links.

  • Discover what makes APT's SureStream different from other approaches that claim to offer Broadcast Audio over the Public Internet.

  • SureStream - The Force Awakens

How to

  • How to set up a SureStream link on the bench


  • Watch the Webinar: How to Create your ULTIMATE IP Audio Network



  • APT SureStream technology

    Published on Feb 15, 2017

Quick Start Guides

  • SureStream Set up - Quick Start

    Published on Jul 22, 2016


  • WorldCast Systems Overview

    Published on Nov 15, 2018
  • The Essential Guide To Audio Over IP for Broadcasters

    Published on Feb 22, 2018

Press Kit

  • WorldCast Systems Logo - Press Kit

    Published on Feb 16, 2017
  • SureStream - Press Kit

    Published on Feb 16, 2017