Telos VX® is the first VoIP (Voice over IP) system for broadcast and is ideal for radio and TV applications, as well as some government applications. From remote IFBs to audience call-ins, it can run anywhere from one or two lines in a small studio to the on-air phones for your entire plant, giving you incredible operational power, adaptable workflows, and superior audio quality.

VX comes in three iterations to suit your needs.

For medium to large facilities, the Telos VX Enterprise hardware appliance has an expandable capacity of up to 120 channels and can grow with your station over time.


For small to medium facilities, the Telos VX Prime+ hardware appliance has a fixed 8-channel capacity.



Telos VXs Virtual VoIP System is our virtualized version of VX, scaleable from a single line to a multi-facility network. VXs, delivered as software only, allows broadcasters the flexibility to pay for only the features they need, adjusting over time as their requirements change for both Radio and Television Applications.


Legendary Telos Audio Quality

Using VoIP, VX combines modern networking with the power of digital signal processing developed by Telos over the past three decades. Every call gets fifth-generation audio processing packed full of technology engineered to extract the cleanest, clearest caller audio from any phone line—even noisy cellular calls. 

VX includes Smart AGC coupled with our famous three-band adaptive Digital Dynamic EQ, a three-band adaptive spectral processor, and noise gating. Call-ducking and host override are part of the VX toolkit as well. Users can conference multiple lines with superior clarity and fidelity. Send audio gets its own sweetening with an AGC, limiter, and Acoustic Echo Cancellation (AEC) technology that eliminates open-mic feedback. 

AEC is crucial when you have talent answering and recording calls for later airing. Without headphones, the caller's own voice is coming out of a cue/preview speaker and immediately getting picked up by the talent microphone, where it is sent back to the caller. This is very distracting to the caller. 

These audio samples demonstrate what the listener will hear with and without AEC in this situation. 

Call Without AEC

Call With AEC

And if you choose to use compatible telco services, calls from mobile handsets with SIP clients, HD capable telephone sets, and PC apps will benefit from VX’s native support of the G.722 codec, instantly improving caller speech quality.

Standards-Based for Easy Connectivity

Whether you are new to IP networking, integrating with an AES67 network, or plugging into a Livewire® network, VX VoIP systems integrate into your ecosystem.

Telos VX systems are “facility-wide” broadcast phone products. That means multiple studios, multiple stations, multiple shows—with minimal hardware requirements. Telco is delivered via IP from your SIP PBX, hosted VoIP service, or UCaaS provider. For carrier-grade reliability and redundancy, a dedicated SIP trunk circuit can be integrated via a Telos-configured Asterisk-based PBX; legacy circuits such as POTS, ISDN, or T1 can be integrated in the same way. Once connected, all telecom and audio connectivity flows via Ethernet.

New-to-AoIP Installation 

Don’t have IP-Audio networking yet? VX will work with all console brands, networked or not, using Telos Alliance xNodes and the VX Call Controller drop-in controller for your console. xNodes, like the Telos Alliance Mixed Signal Node, break out audio into analog and digital formats, along with GPIO logic commands. 

The diagram above shows a typical studio with an analog mixer, using a Telos Alliance Mixed Signal xNode to connect to the console and other broadcast equipment.

AoIP Installation

Installing a VX VoIP system in facilities already powered by Livewire+™ AES67 networks requires even less time and hardware. Your new VX phone system will plug right in for seamless integration of studio phones, mixing consoles, and routing networks. The audio inputs and outputs used and produced by VX are Livewire real-time audio channels and travel over the Livewire AoIP network just like the rest of your audio. You can use existing GPIO ports for “phone ringing” tallies or virtual GPIO for remote control of profanity delay units. 

AES67 Installation

AES67 support brings a new level of compatibility and flexibility to VX VoIP systems. Support for AES67 gives broadcasters the capability of integrating VX into any AES67 environment or compatible SMPTE 2110-30 environments. With plug-and-play connectivity, you can network multiple channels of audio with any manufacturer’s AES67-compliant hardware. Support for SAP advertisement means VX smoothly integrates alongside AES67-enabled Dante® devices.

HTML-5 Control

When combined with Axia® Pathfinder™ Core PRO, you can create touchscreen-friendly custom HTML-5 panels to monitor and control every aspect of the VX system from any web browser. Remote talent can use a panel to manage all the lines in the facility in a Master Control setting; to take calls live while broadcasting from home; or, in a TV Control Room, to manage IFBs used by talent and technical staff in the field. Gone are the days of reporters calling into the wrong IFB and missing their live shot. With an HTML-5 control panel, producers can see the status and caller ID of each IFB line and even have the ability to call the reporter directly (pictured).

TelosCare PLUS Customer Care 

We know that your VX is just one piece of the telephony puzzle, which may include your VoIP provider, PBX vendor, IT team, network security team, and more. We love to leverage our combined centuries of telephony experience to serve as your trusted VoIP ninjas and help you complete and maintain your telephony puzzle for years to come. 

TelosCare PLUS gives you care you need long after the sale, going far beyond basic support and troubleshooting with proactive, holistic service and membership perks.  As we move to a virtual broadcasting world and software becomes increasingly prevalent, Customer Care becomes even more critical. With TelosCare PLUS, you can adapt software to your needs, expanding or retracting your licenses as your operations change.


  • Includes support for AES67, giving broadcasters added flexibility of integrating VX into any AES67 network and compatible SMPTE 2110-30 networks, in addition to Livewire networks.

  • HTML-5 control via Pathfinder Core PRO.

  • SIP call-handling throughout—no internal conversion to analog call handling like some other so-called “VoIP” systems.

  • Works directly with hosted VoIP or PBX services, and in conjunction with a PBX may support POTS, T1/E1, and ISDN BRI for maximum flexibility and cost savings.*

  • Standards-based SIP interface integrates with all modern VoIP-based PBX systems to allow transfers, line-sharing, caller ID, and common telco services for business and studio phones.

  • Standard Ethernet backbone provides a common transport path for both studio audio and telecom needs, resulting in cost savings and simplified studio infrastructure. Connection to hundreds of control devices (software or hardware) is possible.

  • Each call receives a dedicated processing path for unmatched clarity and superior conferencing.

  • Native Livewire® integration: One connection integrates caller audio, program-on-hold, mix-minus, and logic directly into Axia AoIP consoles and networks.

  • Connect VX to any radio console or other broadcast equipment using available Telos Alliance AES/EBU, Mixed Signal, and GPIO xNodes. Audio interfaces feature 48 kHz sampling rate and studio-grade 24-bit A/D converters with 256x oversampling.

  • Powerful dynamic line management enables instant reallocation of call-in lines to studios requiring increased capacity.

  • VSet Call Controllers™ with full-color LCD displays and Telos Status Symbols™ present producers and talent with a rich graphical information display. Each VSet features its own address book and call log.

  • The “Drop-in” VSet Call Controller™ modules can directly integrate VX phone control into your mixing consoles.

  • Clear, clean caller audio from fifth-generation Telos Adaptive Telephony technology, including Digital Dynamic EQ, AGC, adjustable caller ducking, and audio dynamics processing by Omnia®.

  • Wideband acoustic echo cancellation eliminates open-speaker feedback.

  • Support for the G.722 codec enables high-fidelity phone calls from iPhone and Android SIP softphones using a SIP server.


* Due to the wide variation in how traditional phone service can be delivered and the complexities involved in converting those services to SIP, we want to talk with you about your system design before you order. Telos has VX System engineers standing by to help you draw up a configuration that will ensure your VX purchase will perform to your expectations when using legacy telephony circuits.


Telos VX Enterprise 

With capacity expandable to up to 120 channels (hybrids/faders), Telos VX Enterprise is an appliance-based system ideal for medium to extensive facilities that can grow with your station over time. You can easily expand this modular system and configure it to manage a network of 60 or more studios, each with a dedicated Program-On-Hold input—truly a “whole-plant” solution for on-air phones.

  • Base system is licensed for up to 24 channels, expand in license increments of 8 up to 120 channels.

  • A Telos system engineering consultation is required for any system configuration over 72 channels. Please contact us at for assistance. 

  • Maximum number of SIP numbers: Unlimited

  • Maximum active on-air calls: 120

  • Maximum on-air calls on one fader: 12

Learn More.

Telos VX Prime+ 

VX Prime+ is a fixed 8-channel (hybrid) appliance-based system that brings Telos VX performance and VoIP flexibility to small to medium facilities.

  • System capacity of 8 channels. Each call placed on the air receives a dedicated channel for unmatched clarity and superior conferencing and supporting multiple lines of concurrent on-air phones for one to four studios (depending on configuration).

  • Please contact us at for a Telos system engineering consultation.

  • Maximum number of simultaneous calls on-air: 8 (more with conferencing)

  • Maximum number of SIP numbers: 96

Learn More.

Telos VXs Virtual VoIP System for Radio Applications

Telos Alliance® introduced broadcasters to the benefits of VoIP a decade ago with VX, the world’s first VoIP talkshow system, in a hardware appliance. Now, Telos VXs is here to help broadcasters reap the benefits of true virtualization as they adapt to changing broadcast workflows and operations, all while making it easier for teams to produce great-sounding and compelling content. Learn More. 

Learn More.

Telos VXs Virtual VoIP System for Live TV Applications

When Telos VX came out, it helped live TV productions replace racks of phone couplers, contribution hybrids, and engineering coordination lines with a single hardware VoIP Engine. Now, Telos VXs is here to help live TV productions virtualize, all while making it easier for remote teams to tap into production and engineering partylines. Learn More.

Learn More.

VX System Components

VX Engine

VX Enterprise and Prime+ are 1RU rack-mount appliances with two Gigabit Ethernet ports and dual-redundant power supplies. VXs is a container-based solution that runs on your own server or in the cloud. VX systems are web-based, so remote control and configuration are easy—engineers can work from any place they can get online.

You’ll notice no audio I/O or telco ports on VX Engines themselves; that’s because all I/O is handled via Ethernet. The AoIP network supports a wide variety of peripherals such as Axia audio consoles, AES67 audio devices, VSet phones, call management software, console-integrated controllers, and more. VoIP services connect through a dedicated WAN Ethernet jack for routing simplicity and easy maintenance.

Dual VX Engines can be configured in a primary/backup scenario for complete redundancy.

VSet Phones

VSet phones can work like a traditional Telos controller, with calls being selected, held, and dropped in the way to which operators have grown accustomed. But because the VX system is so powerful, it unlocks much more functionality: You can spread multiple calls over several faders, transfer calls, switch Shows, enable Auto-Hold, and more.

The LCD delivers detailed line status, caller information, caller ID, time ringing-in or on-hold, and even caller comments entered in screening software applications. Status Symbols help talent run tight, mistake-free shows. Each VSet phone has its own web server for easy remote configuration and software upgrades. A single Ethernet connection supplies IP connectivity and Power over Ethernet.



The VSet12 is a 12-line IP-based controller for the VX featuring a display that provides line status and caller information.




VSet6 is a 6-line phone controller for VX. With the same capabilities as the VSet12 but half the lines, it’s excellent for smaller or secondary studios.

On-Console Control

Talent can take control of phones without ever having to divert their attention from the board with the Axia Console Controller, which provides the ideal way to integrate broadcast phones into the on-air console—the control center of every studio. VX systems connect directly to Axia Quasar, Fusion, Element, iQx, iQ, and Radius mixing consoles. Use Axia Pathfinder Core PRO to add console control to the iQs virtual console.

You can program the rotary Options Control knobs to trim source or fader gain when turned, and alphanumeric channel displays give complete information on source assignment, channel options, and more.

VSet Call Controller

Want in-console control of your VX system but don’t have an Axia mixing console? No problem—Telos provides VSet Console Controller electronics packages, which may be fitted to your console using panels supplied by your OEM console provider or preferred third-party fabricator. 

VSet Desktop Controller

The Telos VSet Desktop Controller with visual line-status indicators provides a simplified hardware interface for operators and talent to manage a fast-paced and error-free talk show. It provides single-press control of up to 12 lines and two channels, freeing users to focus on their content while quickly taking, Drop, Hold, Transfer, and dial calls.

Telos Alliance xNode Audio Interfaces

Telos Alliance xNodes let you connect VX to any non-networked radio console or other broadcast equipment, using standard analog or AES3 I/O. A GPIO xNode provides control logic where needed. The Telos Alliance Mixed Signal xNode provides analog, AES3, and GPIO interfaces to cover all your bases.

Compatible with Call Management Software 

Since we introduced the VX product family more than a decade ago, Livewire partners have developed incredible call management software and mobile apps designed specifically to tap into the power of VX VoIP systems. Each of these free and paid software packages has unique features to suit many common workflows, and some include additional features such as prize management and social media integration. Please visit the Call Management Software Guide to learn more about the options available.


Use with Axia Pathfinder Core PRO 

For more custom needs, Axia® Pathfinder™ Core PRO Broadcast Controller and VM can monitor, control, and display all aspects of your VX system. This enables customized solutions such as drag-and-drop construction of custom control panels, timed Show changes based on studio schedules, or even API translation between third-party systems to display caller information or control lines. The possibilities are endless.