The APT IP ENCODER Silver and IP DECODER Silver (formerly known as Stream-In/Stream-Out Silver) combine to enable affordable yet professional delivery of audio content over IP networks. Low on cost but rich in features, these units are perfect for standard broadcast applications such as STLs. 

Despite being one of the lowest cost solutions in the market,  they feature the renowned aptX Enhanced coding as well as linear audio as standard. The APT IP Silver devices also support SureStream for increased reliability. 


Audemat ScriptEasy Powerful Performance

  • Reliable and robust encoding/decoding of audio over IP networks
  • Standard algorithms include professional aptX Enhanced & linear audio plus MPEG 2/4 HE-AAC v1/2 coding
  • AUX data transmission, bi-directional on Encoder and Decoder
  • Auto-Detection of received audio format (Decoder)


Audemat ScriptEasy Powerful Control

  • Intuitive web-based browser control
  • Supports Dynamic DNS for global accessibility by hostname rather than IP address
  • Supports UPnP IGD protocol for configuration of UPnP enabled Internet gateways
  • Distributed Intelligence powered by ScriptEasy
  • Supports SNMP monitoring


Audemat ScriptEasy Powerful Savings

  • Extremely affordable with no compromise to quality
  • Features APT’s revolutionary SureStream technology for seamless, broadcast-grade audio over public IP links
  • UDP stream forwarding of audio and non-audio data, bidirectional on Encoder and Decoder
  • Support of virtual IP interfaces for easy multi-network integration


  • Low cost separate encoder and decoder
  • SureStream technology as standard
  • Virtual IP port extensions and VLAN
  • Professional range of algorithms as standard
  • Compact 1/2U design – fit two units in 1U rack space 
  • Compatible with APT & NACIP-compliant codecs
  • Dynamic DNS Client
  • Bi-directional UDP stream forwarding on Encoder and Decoder
  • UPnP Support for NAT gateway configuration
  • Net security features by firewall capability
  • Intuitive web interface
  • Quiet, no-fan operation



IP Silver Unit status Page
Status Page
IP Silver Unit Performance MonitorPerformance Monitor

SureStream for Broadcast Quality Audio over IP

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.

SureStream technology is available as an option on this codec. 

 Learn more about SureStream

Advanced Telemetry & Remote Control with ScriptEasy

ScriptEasy is the revolutionary facility control software developed by WorldCast Systems to give users the power and flexibility to create “Smart” sites; ones that can automatically take action to correct any critical errors that affect operations.

Featuring an intuitive Graphic User Interface (GUI), ScriptEasy incorporates GPIO functions, serial communications, logic operators, live user inputs, timers and more. This allows the site operations to be “scripted”, to allow evaluation of multiple parameters and even automatically engage backup systems, while simultaneously alerting relevant technical personnel.

Learn more about ScriptEasy

Connect with WorldCast MANAGER

The WorldCast MANAGER simplifies the management of all SNMP-enabled devices in a network, providing real-time status and visualization of multiple devices from a single screen. The intuitive and simple-to-use interface shows all devices located at your site(s) displaying product information, alerting you to any alarms and providing one-click access to the unit’s web-based control interface.

Free to download, the WorldCast MANAGER is compatible with all WorldCast Systems’ equipment as well as SNMP devices from ANY manufacturer.

Learn more about WorldCast MANAGER


The APT IP Silver units can be used in wide-range of applications within broadcast and other industries. Running SureStream on a single link between the two devices increases the reliability and resilience of the connection. 

  • Studio Transmitter Links
  • Confidence Monitoring
  • Commercial IP audio distribution
  • IP music distribution systems in hotels, hospitals, campuses etc..
  • In-store audio distribution applications
Single Port Configuration
user report

User report

«The IP Silvers enable our customers to utilize datalinks that are very low cost and very high quality and, for an initial outlay that is nearly half that of the previous solution.»
Marius Marin, Owner and CEO of Laet Exim, Romania


Current version: 1.5.2

EthernetEthernet port, RJ45 for management and streaming
Virtual NetworkVirtual Interfaces and VLAN tagging
Analog I/OElectronically balanced, capacitive isolated XLR  for Left/Right, Imp. Hi/Lo and 600 Ω
Serial Aux Data9 pin D Type, RS232 level
USB (Decoder)5VDC supply of ext. equipment
PSU ConnectorDC power supply connector with locking capability for ext. PSU
ManagementWeb GUI, APT NMS, SNMP, XML API (available with a later release)
Input/OutputInput (Encoder) +24dBu / Output (Decoder) +24dBu
Audio Bandwidth10Hz to 20kHz mono & stereo 
Standard Coding AlgorithmsEnhanced apt-X 16 & 24 Bit, Linear PCM 16 & 24 Bit, MPEG2/4 HE-AAC v1/v2
Coding Delaymin. 2ms on Eapt-X  and higher depending on chosen algorithm
Signal Processing24Bit
Network and IP
IP Protocols SupportedRTP/UDP/IP, RTCP, DNS, Dynamic DNS, DHCP, ICMP, IGMP, VLAN#, UPnP (IGD), NTP, SNMP, SMTP, HTTPS (management)
IP StatisticsComplete IP Statistics for each stream 
Casting ModesUnicast, multiple unicast, multicast, multi- multicast
De-Jitter Buffer (Decoder)Buffer size 5 - 5,000ms adjustable, automatic packets re-sequencer 
RTP/UPD Streaming and ModesStereo audio multiple Tx-Streams, UDP stream forwarding (duplex), Auto-Detection of received Stream, Auto-Reply to sender (Decoder)
Quality of ServiceDiffServ, with separate DSCP values per stream, SureStream Technology* and Error Concealment
Network SecurityService Filter and Firewall Features
Serial Data Rates (embedded)1200, 2400, 4800, 9600 Baud
Serial Data Rates via IP1200 - 115,200 Baud (8 rates)
AUX Data via UDPUDP forwarding PAD or private Data
Physical specification
External Dimensions (H / W / L)44mm x 220mm x 160mm ; 1.73” x 8.66” x 6.3”
Weight< 1,5 kg - 3.355 lbs
Power Supply ext.100-240VAC 50-60Hz, 12VDC (wall-mount)
Power Consumption< 10W
Guaranteed Working Temperatures0°C - +45°C
HumidityUp to 95% relative humidity (non-condensing)

Order information

Hardware Options
SPP00015Rack Mounting Kit for APT IP Silver



  • AUDEMAT ScriptEasy

    Published on Jun 7, 2016
  • APT SureStream technology

    Published on Jun 8, 2016

    Published on Jun 27, 2016

Quick Start Guides

  • APT IP SILVER - Quick Start

    Published on Jun 30, 2016


  • APT IP Silver

    Published on Jun 30, 2016
  • Scripteasy V2

    Published on Jun 7, 2016


  • WorldNet NMS Software

    Published on Jun 8, 2016


  • Corporate Catalog

    Published on May 3, 2016
  • WorldCast Systems Overview

    Published on Oct 18, 2016
  • The Essential Guide To Audio Over IP for Broadcasters

    Published on Jun 27, 2016

Press Kit

  • WorldCast Systems Logo - Press Kit

    Published on Aug 29, 2016
  • APT IP Silver - Press Kit

    Published on Aug 29, 2016