As LTE subscriptions increase and the service be-comes more common, one of the LTE services, VoLTE, is also being utilized more. However, weaknesses such as avoiding data fees are brought up, and this poses a great threat to the LTE system. This paper describes the structure of the VoLTE system, fees, session registration and cancellation. As well as the weakness of TCP retransmission and mVoIP service from the existing LTE. It will also explain the weakness of data fees from the connecting VoLTE, which the research team discovered, and talk about measures to improve such weaknesses.
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