Vol-tee，或者voice over el tee ee都可以。
VoLTE即Voice over LTE
读音：英[vɔɪs] 美[vɔɪs]
n.嗓音，语态；呼声，发言权；歌唱才能。
over：英[ˈəʊvə(r)] 美[ˈoʊvə(r)]
prep.表示方向 越过；部份或全部覆盖在……上面。
例句1：
The volte face is particularly dramatic among neoconservatives.
“新保守主义者的转向尤其戏剧化。”
例句2：
Studied the decay law of X-ray in steel by experiment, and establish the curve about the relation between radiography-attenuation and tube volte and current.
“本文首先对X射线在物质中的衰减规律进行研究，建立了衰减系数与管电压、管电流的关系曲线。”