Complete Communications Engineering

Radio over IP GatewaysVOCAL’s Radio over IP Gateway enables the interoperation of different radio systems over  IP networks. Our gateway designs provide cost-effective links between radio networks in remote areas where long distances, rugged terrain, or other conditions make continuous line-of-sight communications prohibitive. Contact us to discuss your RoIP application. 

VOCAL’s RoIP ANSI C software libraries are optimized for performance and support-leading architectures from TI, ADI, ARM, Intel, and other vendors. Our RoIP Gateway Reference Design may be licensed as a complete turn-key system, with custom solutions available to meet your specific requirements.

RoIP Gateway Features:

  • Turn key RoIP Gateway hardware and software solutions
  • Full duplex and half duplex modes of operation
  • Support for PTT and other radio control signaling
  • Support for RoIP with and without EUROCAE ED-137
  • MELPe, TSVCIS, G.711, G.729AB, and other standard voice codecs
  • Robust echo canceller and noise reduction software
  • Network stack with adaptive jitter control
  • SRTP for secure communications
  • Custom ROIP design solutions
  • Applications

  • Interoperate with industrial, commercial, medical, and mobile radio networks
  • Homeland Security
  • Public Safety/First Responders
  • UAV Communications
  • Rail System Communications
  • Radio Over IP Gateway Reference Design

    VOCAL’s RoIP Gateway reference design enables rapid development of networked RF applications using IP protocols. Our RoIP solution is compatible with various radio standards and supports both full-duplex and half-duplex RF. The RoIP gateway radio controller interfaces with the local radio unit to transmit and receive RF signals on the local radio network.

    Our radio controller can support full- and half-duplex radio communications, as well as PTT and other radio controls. The media processor sends and receives digital radio packets over an IP network.

    RoIP Gateway Reference Design


    RoIP Framework Configuration

    VOCAL’s RoIP software provides application developers with a highly configurable framework. In addition to a network stack, jitter control, RTP, and other networking protocols, our software provides a wide range of voice compression algorithms (MELPe, G.711, G.722, G.729, Opus, etc.). It also features robust echo cancellation and noise reduction algorithms. When combined with SRTP, SDES, IPsec, and encryption, VOCAL’s comprehensive RoIP software can facilitate secure communications with superior voice quality in even the most challenging of environments.

    What Is EUROCAE ED-137?

    The European Organization for Civil Aviation Equipment (EUROCAE) has defined the ED-137 standards for air-ground and ground-ground communications. This allows end users to select products adhering to these standards from different vendors, instead of relying on single-sourced custom solutions. With ED-137, they can still be confident in meeting operational and interoperability requirements.

    VOCAL’s RoIP software can be deployed with EUROCAE ED-137 support. ED-137 can be used for many use cases, not just those involving Air Traffic Management (ATM).  We have deployed ED-137 for a variety of uses, including those that do not include radio but are still Push-to-Talk type systems. Give our engineers a call to discuss your ED-137 needs.

    Reference Design Kit

    VOCAL’s RoIP Gateway RDK consists of a customizable, fully-functional hardware and software solution, including:
  • Schematics
  • BOM
  • Complete custom firmware
  • Technical engineering assistance
  • Lifetime product maintenance and support
  • Supported Platforms

    VOCAL’s optimized RoIP software is available for the platforms listed below. Contact us with any questions about specific platforms; we are always adding new platforms, so please ask.


    ProcessorsOperating Systems
    • Texas Instruments – C6000 (TMS320C62x, TMS320C64x, TMS320C645x, TMS320C66x, TMS320C67x), DaVinci, OMAP, C5000 (TMS320C55x)
    • Analog Devices – Blackfin, TigerSHARC, SHARC
    • PowerPC
    • MIPS – MIPS32, MIPS64, MIPS4Kc
    • ARM – ARM7, ARM9, ARM9E, ARM10E, ARM11, StrongARM, ARMCortex-A8/A9/A15/A3x/A5x/A7x, Cortex-M3/M4/M7/M33
    • Intel / AMD – x86, x64 (both 32 and 64 bit modes)
    • Linux, uClinux, BSD, Unix
    • Microsoft Windows ACM / RTC / CE / Mobile
    • Apple iOS / iPhone / iPad & MacOS
    • Google Android
    • Green Hills Integrity
    • Micrium μCOS
    • Symbian
    • Wind River VxWorks
    • eCOS / eCOSPro