Voice over LTE and Voice over Wi-Fi

The only packet-voice solution delivered using cloud native virtualized network functions


    • phone40
      • VoLTE and VoWiFi increase efficiency and coverage

    • cloud-computing-11
      • Cloud native VNFs fulfil promise of NFV deployment

    • cloud-computing-26
      • Deploy end-to-end across public, private and hybrid clouds

    • chronometer
      • Lower overheads, increased resilience, and capacity on-demand

    • wifi107
      • Complete IR.92, IR.94 VoLTE and IR.51 VoWiFi support

    • networking15
      • Highly orchestrated and ready for 5G network slicing


With the spectral efficiencies of Voice over LTE (VoLTE) and the coverage possibilities of Voice over Wi-Fi (VoWiFi), the momentum is increasing towards end-to-end packet-voice, using both licensed and unlicensed spectrum. Although NFV was expected to enable the cost effective and flexible deployment of GSMA IR.92, IR.94, IR.51 and rich communications suite (RCS) services, network operators planning broad deployment of these technologies now recognize that NFV is not enough.

Although VoLTE demands a complete overhaul of service infrastructures, it is a fundamental requirement for mobile network operators. Most operators are relying on NFV to deliver a viable, cost-effective and resilient VoLTE service, but an approach to NFV based on classic virtual machine (VM) constructs cannot meet these requirements. Although VMs can enable operators to port legacy software components from proprietary hardware relatively easily, this VM approach requires a hypervisor environment with extremely high overheads and costly redundancy measures to protect against infrastructure failures. The result is an implementation that practically mirrors non-virtualized implementations, and fails to realize the promised advantages of NFV while masking the shortcomings of this ported code for genuine cloud deployments.

Only cloud native virtualized network functions running within highly orchestrated container clusters can deliver infrastructures and applications that are cost-effective, agile, elastic and resilient.

Solution description

Solution description

Metaswitch is the first company to deliver a complete VoLTE solution built using cloud native software methodologies. Mobile network operators can deploy our VoLTE solution in public, private or hybrid cloud environments using lightweight Containers. By virtualizing our components at the OS level instead of at the hardware level (as with the VM / hypervisor approach), we have dramatically reduced overheads, which enables orchestration systems to instantiate our virtualized network functions (VNFs) instantly to provide capacity on-demand and resilience when required.

The VoLTE solution delivers a complete IR.92 and IR.94 Voice over LTE service infrastructure, and supports IR.51 Voice over Wi-Fi (VoWiFi) for mobile network operators that want to rapidly offload and extend high-quality mobile coverage on unlicensed spectrum. Furthermore, our solution simplifies the process of establishing and maintaining IR.95 VoLTE peering and roaming interconnect services.

The VoLTE solution supports any VNF manager, and includes a broad suite of analytics and diagnostic tools that serve the management and orchestration (MANO) layers with the information they need to make critical deployment and scaling decisions. With the operational cost savings, dynamic deployments and instant elastic scaling that our VoLTE solution enables, Metaswitch is committed to driving the development of automated instantiation and life-cycle management of complex VNFs by contributing our expertise across all open hierarchical orchestration ecosystems.

Mobile network operators that want to implement 5G network slicing require a fully orchestrated, cloud native, virtualized VoLTE and VoWiFi solution. Network slicing enables operators to segment the entire end-to-end communications infrastructure to support highly efficient QoS and QoE metrics for specific applications, services and operators across a common mobile architecture. 

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