This video explains IMS architecture from VoLTE perspective. Role played by LTE network and various IMS nodes such as P-CSCF, I-CSCF, S-CSCF, MGWC, MGW, MRFC, MRFP, Application Server, IBCF, BGCF, Transition Gateway, HSS and SLF during a VoLTE call is explained in detail.