3GPP TS 23.501, TS 23.502, GSMA NG.114
Services
VoNR
Voice over New Radio
Short Definition
Native voice and video calling running entirely over 5G Standalone (SA) radio and 5G Core without falling back to 4G LTE.
Technical Deep Dive
Voice over New Radio (VoNR, also known as Vo5G) is the 5G SA equivalent of VoLTE. Voice packets are encapsulated over 5G NR radio bearers with 5QI=1 (conversational voice) and processed by an IP Multimedia Subsystem (IMS) connected to the 5G UPF. VoNR delivers ultra-fast call setup times (<1.5s), superior EVS (Enhanced Voice Services) HD audio quality, and prevents the device from dropping down to 4G during active voice calls (unlike EPS Fallback), preserving high-speed 5G data sessions during phone calls.
Key Responsibilities & Capabilities
01.Pure 5G Standalone voice and conversational video services
02.Sub-second call setup and high-definition EVS codec transmission
03.Zero interruption to 5G ultra-high-speed data downloads during calls
04.SIP/IMS control signaling over dedicated 5QI=5 bearer
3GPP Standards Reference
3GPP TS 23.501, TS 23.502, GSMA NG.114
Interfaces & Reference Points
Uu (5QI=1)N3N6 (to IMS)Gm, Rx/N5
Related 5G Terms
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