Ericsson VoLTE

Ericssons offering for Voice over LTE (VoLTE) allows operators to offer high quality communication services using all-IP technology over LTE based mobile broadband. VoLTE enables a modern communications experience to users including services like HD voice, HD+ voice (EVS), video calling, IP messaging, content sharing within calls, voice for IoT (Cat-M1) and new service innovations. These services work for any device types that support the technology; smartphones, tablets, smartwatches, wearables and Cat-M1 IoT devices.

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Market situation

Operators are competing for the best mobile broadband offering, with highest speeds and best coverage, where Long Term Evolution (LTE) is the means for most operators to achieve this. On the other hand communication services are considered a key part of the operator’s business. In order to continue supporting operator services such as voice and SMS using packet only access such as LTE, Voice over LTE (VoLTE) was developed.

With the introduction of VoLTE operators can leverage the all-IP based network architecture to ensure and improve voice quality, while also opening up for broader range of communication capabilities such as for example video calling, multi-device and multi-SIM support.

Ericsson's VoLTE offering

The Ericsson VoLTE offering provides operators with a complete solution to evolve their voice and SMS business towards an all-IP communications network. This is achieved by evolving the installed base of CS core networks towards IMS core networks. In addition to ordinary mobile telephony services, Ericsson’s VoLTE offering also supports value added services such as: HD voice, HD+ voice (EVS), video calling, Wi-Fi calling, multi-device, multi-SIM, enriched calling services and voice support for IoT devices (Cat-M1).

Ericsson's VoLTE offering is an end-to-end solution, including IMS, Evolved Packet Core (EPC), LTE-RAN, Subscriber Data Management, OSS/BSS and system integration services. The Ericsson VoLTE solution is fully optimized for cloud deployment, agnostic to the underlying infrastructure for both media and control plane, and includes critical automation to simplify creation and maintenance of end-user services.

Ericsson’s Fast VoLTE Launch solution, a complete pre-integrated virtual IP Multimedia Subsystem (IMS) solution facilitates fast deployment of VoLTE and also Wi-Fi calling. Operators can start with a small network set-up for thousands of subscribers, and the offering supports future scaling to Millions of subscribers. The pre-packaged solution includes products such as virtual Mobile Telephony Application Server (vMTAS), virtual Session Border Controller (vSBC), virtual Call Session Control Function (vCSCF), virtual Media Resource Function (vMRF) and virtual IPWorks. It is built on Ericsson BSP 8100 telecom grade hardware and the OpenStack-based virtual infrastructure manager Ericsson Cloud Execution Environment. 

In order to handle a smooth evolution from circuit switched voice to VoLTE as well as situations of non-ubiquitous LTE coverage, Ericsson’s VoLTE offering supports a full set of complementing accesses including both 2G, 3G and Wi-Fi. Seamless handover of calls between LTE and Wi-Fi through packet handover, as well as 2G/3G with Single Radio Voice Call Continuity (SRVCC) are also supported.

Ericsson VoLTE offering is verified towards all major device and chipset vendors. This secures smooth deployment, efficient network operations and future evolution of the VoLTE offering.

Operator benefits

Ericsson’s VoLTE offering is a complete end-to-end offering based on GSMA IR.92 and related specifications to provide SMS, voice and video communication services over LTE access. This guarantees full device interoperability and allows for direct IP interconnect and roaming towards other operators.

Building on an all-IP infrastructure such as LTE, EPC and IMS allows operators not only to cut operational cost through improved resource utilization such as for example improved spectrum efficiency, but also introduce new higher value-added services to end-users in order to reduce churn, such as HD voice, HD+ voice (EVS), video calling, multi-device, multi-SIM, call enrichment etc.

Ericsson VoLTE offering includes full set of professional services based on strong local integration capabilities and global experience.

User benefits

VoLTE users will keep the convenience of the mobile experience, using the built-in phone dialer and call screen with no need for app’s to make calls or messaging over IP. Users can also continue to benefit of a service with global reach, i.e. make and receive calls from any phone number in the world as well as continue to enjoy the advantage of roaming anywhere and still be reachable.

In addition VoLTE users will enjoy more user friendly and intuitive services such as:

  • Service reach: Allows you to always be reachable, whether it is using LTE in urban areas, 2G/3G in rural areas or Wi-Fi in your home. It also enables you to be reached using one number for all your devices, including non-smartphone type of device such as; tablets, laptops, smartwatches, web clients etc. 
  • HD voice: Providing you with an audio experience beyond what is common in today’s networks. Including wideband codecs like AMR-WB but also evolving into super-wideband and full-band codecs like 3GPP HD+ voice (using Enhanced Voice Service (EVS) codec) for superior voice and music-within-calls experience. 
  • Video calling: With the build-out of mobile broadband and modern devices with high resolution screens and cameras you can enjoy high quality video calling from almost anywhere. Call enrichment: Further enrichments of VoLTE calls are enabled by IMS and includes sharing of content such as pictures, maps, videos etc. during calls and call establishment.

Ericsson solution advantages

Ericsson provides an end-to end VoLTE calling offering, including IMS, LTE-RAN, Evolved Packet Core, Mobile Switching, subscriber data management, BSS/OSS and professional services.

In addition, Ericsson performs interoperability testing with leading device and chipset vendors, securing interoperability and fast TTM.

Ericsson has more VoLTE contracts and launched live networks than any other vendor, with more than 40 live networks across Americas, Europe, Middle East, Africa and Asia Pacific. These networks are deployed as both native and virtual IMS, and we run voice traffic for Millions of VoLTE subscribers as cloud deployments.


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