What is volte full form ??
The VoLTE full form is Voice over LTE. How VoLTE is different from previous voice network? In contrast to the previous network generations (3G and 2G ), having separate core networks for data and voice . 3G/2G having packet core network for data and circuit core network for voice . Packet core have network nodes SGSN and GGSN. Voice core network have nodes VLR, MSC and GMSC.
LTE is the data only network, means there is no separate core network for data and voice. On roaming side there is a single node which is called Mobile Management Entity (MME). Mobile phone uses MME for voice and data both. In previous telecom networks,
As VoLTE full form says that , it uses LTE network. Which is packet based network. So call is the VoiP Call.
When there is no VoLTE, core network fall back on 3G or 2G network for voice call. Call uses SS7 , which is a circuit switched network. After the call, phone again switches back to the 4G network.