EVS (Enhanced Voice Services) is the 2014 voice codec for 4G and 5G mobile, the modern successor to AMR. It spans narrowband all the way to fullband speech and is music-capable, delivering markedly more natural voice than AMR-WB while using bits more efficiently. Crucially for mobile, it has strong packet-loss resilience — including a channel-aware mode and good concealment — so calls hold together on lossy radio. EVS is the default high-quality codec behind VoLTE and VoNR 'HD Voice' and 'HD Voice+' branding, and it interoperates with AMR-WB for backward compatibility. For an engineer it represents the current state of the art in standardized, carrier-grade conversational audio.
The book · Volume 4 of 7
Audio for Video: A Complete Guide to Sound in Video Products: From PCM and Codecs to Loudness, Accessibility, and Real-Time Voice Processing
EVS is the voice codec behind modern VoLTE and VoNR calls, and bridging it to WebRTC or SIP is where quality often drops. This volume explains EVS in depth alongside G.711, G.722, AMR and Opus, with bandwidth modes and transcoding trade-offs, so you can plan telephony interop with the right codec choices. Written by Nikolay Sapunov, CEO at Fora Soft.
Bridging EVS mobile voice calls into your app without losing quality at the gateway?
Describe your telephony path and we will propose a codec and transcoding plan for EVS interop with expected quality and cost per call. 250+ video products shipped since 2005.
