Excellence in Broadcast

Tieline Gateway 4

The Gateway-4 is a powerful DSP-based 1RU IP codec designed for live remote broadcasting applications, as well as STL or SSL links. The Gateway-4 enables transport of multiple channels of mono or stereo audio across the Public Internet or any QoS-enabled IP network, including T1 and T3 connections and private WANs with MPLS. The Gateway includes support for AES67, ST 2110-30, AES3 and analogue I/O as standard.


The new generation Gateway-4 delivers best-in-class DSP-based reliability and performance for mission critical broadcast streaming applications. It is ideal for:

  • Remote broadcast applications.
  • Studio-to-Transmitter Links (STLs)
  • Studio-to-Studio Links (SSLs)

The Gateway-4 is designed for solutions requiring up to 4 audio streaming channels with advanced redundancy features and remote configuration and control. It supports 4 full-duplex audio channels in 1RU and is backward compatible with all Tieline IP codecs. The Gateway-4 provides two stereo connections, or one stereo and two mono connections, or up to 4 mono connections.

Features at a Glance

Analogue, AES3
Support for AES67, plus AES3 (AES/EBU) and analogue I/O options

Wi-Fi (USB Dongle)
Expand your network options and connect over Wi-Fi networks

SIP and IP Intercoms
SIP EBU Tech 3326, 3368, and EBU Tech 3347

Dual AoIP Ports
Stream AoIP from dual ports

SD card
SD card slot for firmware upgrades, storage and SDIO

Dual USB ports
Dual USB ports support firmware upgrades, storage and Wi-Fi modems.

Dual Internal Power Supplies
Dual power supplies provide backup if one fails

Dual Ethernet Ports
Connect using different Telcos for diversity using SmartStream PLUS redundant streaming

Module Compatible
Module slot for ISDN network compatibility, and for future hardware innovations

Support for multi-unicasting to up to 20 endpoints

Support for multicasting over compatible IP networks to unlimited endpoints

Silence Detection, PSU Failure, Lost connection, Temperature, AES Input, AES Reference, SNMP and more

Expanded Backup Options
Multiple levels of power, audio and network redundancy. The codec features dual Gigabit Ethernet ports, dual internal power supplies, automated audio silence detection and IP network backup solutions to ensure you’re always on the air.48kHz, 96kHz sampling

AoIP Interfaces


Purchase with an optional WheatNet-IP card for interoperability with WheatNet-IP networks
Note: Optional at time of Purchase

AES67 Ready

Ready out-of-the-box so forget hardware card upgrades, just connect and go! Supports 2 AES67 streams.

ST 2110-30 Ready

SMPTE ST 2110-30 compliant out-of-the-box.

SmartStream PLUS redundant streaming

Connect multiple IP links to codecs and use SmartStream PLUS to stream simultaneous redundant data streams and deliver seamless redundancy when streaming over IP.

Bond multiple interfaces with Fuse-IP

Imagine the peace of mind knowing you can bond data links from different Telcos and let Tieline’s Fuse-IP technology automatically manage the data capability of each link!


The Gateway-4 is perfect for STL, SSL and audio distribution applications, with support for multicasting and multiple unicasting technologies. It is also perfect for managing multiple incoming remotes at the studio and can simultaneously connect to up to 4 hardware codecs or Report-IT Enterprise smartphone app users.


Dimensions: 19” x 1 3/4” x 11 13/16” [482mm (W) x 44.45mm (H) x 300mm (D)] excluding rear connectors
Weight: 4 Kg /8 lb 13.100 oz
Power: Dual AC 90-240V IEC power inlets; 2A 50-60 Hz
Operating temp: 0°C to 45°C (32°F to 113°F)
Humidity: 20% ≤RH ≤70% (0 to 35°C/32°F to 95°F), non-condensing
IP Algorithms: Tieline Music, Tieline MusicPLUS, Opus, G.711, G.722, MPEG Layer 2, MPEG Layer-3 LC-AAC, HE-AAC, HE-AACv.2, AAC-LD, AAC-ELD, 16/24 bit aptX® Enhanced algorithm*
IP (uncompressed): Linear PCM16/24 bit 32kHz, 44.1kHz, 48kHz, 96kHz sampling.


Robust dual DSP-based architecture designed for rock solid, mission critical STL audio
Linear PCM16/24 bit 32kHz, 44.1kHz, 48kHz, 96kHz sampling
Up to 4 bidirectional mono streams, bidirectional stereo plus mono, or 2 bidirectional stereo streams
Multicasting an audio stream to a maximum of 20 multi-unicast audio streams
Streaming in multicast server mode to unlimited endpoints over compatible IP networks.
Popular algorithms including LC-AAC, HE-AAC v1 and v2, AAC-LD, AAC-ELDv1 and v2, Opus, MPEG II, MPEG Layer-3, Tieline Music and MusicPLUS, G.722 and G.711.
Low-delay, cascade resilient aptX® Enhanced algorithm*
Optional WheatNet-IP card*
Up to 2 stereo or 4 mono WheatNet-IP audio channels in/out.


Dual Gigabit (10/100/1000) Ethernet ports support automatic switching for redundancy
Dual AoIP ports for AES67 / SMPTE ST 2110-30 audio over IP streaming; supports 2 AES67 streams
Connect over Wi-Fi using USB Wi-Fi dongles*
Optional Gateway Euro ISDN module for connectivity over ISDN networks. Supports 2 B-channels
Automated failover to backup connections.
Support for up to 4 output audio source fail over options
SmartStream PLUS dual redundant IP streaming
Fuse-IP network bonding (data aggregation)
SIP (SDP) compliant with EBU N/ACIP Tech 3326 and 3368 for interoperability with other codecs
I3P EBU Tech 3347 integration for Intercom compatibility over IP
Deterministic SIP answering and call routing: Configure up to 16 SIP accounts and connect up to 2 SIP interfaces
Selectable fixed or automatic jitter buffer: 5 automated settings available to manage network connectivity and avoid dropouts (includes configurable min and max buffer settings).
Configurable Forward Error Correction (FEC)
Highly advanced error concealment strategies
Real-time IP connection packet statistics
Real-time IP link quality displayed.
Support for Line Hunt dialling/answering and caller IDs using Tieline IP


Full hardware front panel interface including navigation, LCD display, PPM meters and dialling key pad
User-friendly HTML5 Toolbox Web-GUI enables codec configuration and control remotely over WANs
AES67 Web-GUI for configuration of AES67 and ST 2110-30 audio streams over an AES67 LAN; supports 2 AES67 streams
Toolbox Scheduler supports loading/unloading, connecting and disconnecting programs
Use the Cloud Codec Controller to configure & manage your entire codec network remotely
The TieLink Traversal Server makes dialling easy with centralized contact list management and self discovery of codecs within customized call groups*
Auto switching, dual internal AC power supplies
IPv4 & IPv6 compatible and ready
Asymmetric algorithmic encode/decode
Integrated alarm management including automatic silence detection
Low latency in-band RS-232 aux data channel
Configurable software rules engine via web-GUI for Control Port (8 GPIOs), plus WheatNet-IP LIO* compatibility.
Upgrade firmware from SD card or USB sticks*
Backup and restore configuration via USB sticks
Automated firmware upgrade notifications via Web-GUI
Support for multiple languages: English, Spanish, Portuguese and French*
Backward compatible with all Tieline IP codecs


User name and password protection of codec and Toolbox HTML5 Web-GUI
Support for SSL Security Certificate installation
SIP allow lists and deny lists allow filtering of SIP URIs and User Agents.
Configuration of non-standard ports
Firewall settings to enable or disable a range of firewall-related network services, or limit ping to only work in a local subnet
Implementation of CSRF protection (Cross-Site Request Forgery)
Cloud Codec Controller supports admin and user level access to codecs with password protection