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Thread: What are the advantages of VoLTE over CSFB and other OTT?

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    Post What are the advantages of VoLTE over CSFB and other OTT?

    Voice over long term evolution (VoLTE) is an IMS-based voice solution defined by 3GPP. By deploying the IMS network, operators not only migrate traditional voice and short message services on live networks but also integrate voice services with various enhanced functions to diversify services.

    VoLTE advantages


    • The VoLTE solution inherits all services provided by the CS network, including common services, such as emergency calls and interception, and services that are used only by regulatory bodies.
    • The VoLTE solution can implement E2E QoS control and guarantee voice call quality.
    •  In the VoLTE solution, voice services are carried on IP networks. Therefore, subscribers can enjoy richer multimedia services through the IMS network, compete with OTT.
    • Subscriber identities (such as the MSISDN) are reserved, which maximizes carriers' resource usage and facilitates service profit gain.
    • The IMS architecture, supported by mature 3GPP standards and specifications, is considered to be the next generation core network by the communications industry. The IMS architecture ensures roaming services and network interworking.


    VoLTE is also Faster and better which provides HD voice quality QCI differentiation.

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    Comparison Among CSFB, SVLTE, VoLTE and OTT

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  3. #2
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    Hi Telecominfo
    In my country, the vedor said that we can't make call in LTE (just data),
    so can you explain clearly how to use VoLTE




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    Hi Simbas,

    That depends on operator's strategy, may be your operator want to use existing 2G,3G for voice and 4G for LTE-data only to reduce IMS costs.
    But without IMS, VoLTE can not be implemented/enabled in any network.


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    Greate, Telecominfo
    I have ask the expert, exactly what you said, we use existing 2G, 3G for voice and 4G for data, mainly for economic reasons.


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