Long Term Evolution (LTE) is been strongly deployed by the major operators offering a high data rate up to 100Mbps for users data applications. However, the LTE 4G technology lacks to provide the main source of revenue for the operators, which is the voice service. This paper studies the latest up to date solutions for the voice over LTE problem such as Single Radio Voice Call Continuity, Circuit Switched Fall Back, Voice over LTE via Generic Access and third party services for providing call continuity over LTE. The paper analyzes the pros and cons for these solutions and concludes with a suggestion of the best suitable solution for the operators to provide a seamless voice over LTE based on their infrastructure.
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