With the gradual maturity of Vo LTE terminal

Vo LTE voice service based on IMS comes to be a key to deal with OTT voice services and to develope RCS business for telecom operator

at the same time

the construction of IMS network has two kinds of construction schemes

which are upgrading fixed IMS network and separate constructing new IMS network

in this paper

in this two schemes we analyze the construction plan of the main network elements of Vo LTE core network such as CSCF、HSS、SBC、MMTEL、ENUM/DNS、MGCF、DRA、MME、PCRF、PGW、e Node B

at the same time

we also gives the relevant construction opinion about the IMS network construction scheme for telecom operators to undertake Vo LTE voice service.