Voice over LTE

High-speed wireless communication functionality VoLTE calling on a Samsung Galaxy S20+ Voice over LTE (acronym: VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. VoLTE has up to three times the voice and data capacity of older 3G UMTS and up to six times more than 2G GSM. It uses less bandwidth because VoLTE's packet headers are smaller than those of unoptimized VoIP/LTE.[citation needed] VoLTE calls are usually charged at the same rate as other calls. To make a VoLTE call, the device, its firmware, and the mobile telephone providers on each end, as well as the inter-carrier connectivity must all implement the service in the area, and be able to work together. VoLTE has been marketed as "HD voice" by some carriers, but this is a broader concept.[clarification needed] Moreover, HD+ (EVS) is used only in LTE and NR; HD voice was available in 3G too.[original research?] Overview VoLTE is based on the IP Multimedia Subsystem (IMS) architectural framework, with specific profiles for control and media planes of voice service. This facilitates VoLTE on the LTE wireless broadband service defined by GSMA in PRD IR.92.