VoLTE and VoNR: The Evolution of Voice in Mobile Networks
By Andrea Morelli, Ph.D.
October 16, 2025
Modules
Estimated reading time: 3 minutes
Voice communication in mobile networks has undergone significant changes over the last decade. Once confined to dedicated 2G and 3G channels, voice services have transitioned to fully IP-based solutions. Two key technologies have driven this shift:
- Voice over LTE (VoLTE)
- Voice over New Radio (VoNR)
Both enable voice to coexist with data traffic, ensuring higher quality and paving the way for future digital communications.
Experience Voice without Limits
From Circuit-Switched to All-IP Voice
Traditional mobile voice calls were based on circuit-switched networks, where a dedicated channel carried the conversation.
With LTE, networks became data-centric, but early LTE deployments still relied on legacy networks for voice. VoLTE then emerged as the first solution to fully integrate voice over an IP network, eliminating the need for fallback to older technologies.
5G continues this evolution with VoNR, a native voice service that leverages 5G stand-alone architecture. It promises:
- Better performance
- New capabilities
- Independence from legacy infrastructures
VoLTE (4G)
VoLTE allows voice calls to be transmitted as data packets over LTE networks. Instead of a separate voice channel, calls use the same infrastructure as web browsing or video streaming.
The main advantages of VoLTE are:
- Enhanced audio quality: The AMR-WB codec delivers clearer, more natural conversations compared to legacy networks.
- Reduced call setup time: Connections typically establish in less than two seconds, compared to 3G’s usual five to ten.
- Simultaneous voice and data: Users can browse or use apps during calls without interruptions.
- Improved spectrum efficiency: Operators can optimize radio resources and gradually phase out 2G and 3G networks.
Today, VoLTE is widely deployed worldwide and has become the standard for mobile voice over 4G.
VoNR (5G)
With the rollout of stand-alone 5G networks, VoNR enables voice calls to remain entirely within 5G. This eliminates the need to fall back to LTE or older technologies. It builds on VoLTE principles but leverages 5G’s improved capabilities.
The key benefits of VoNR are:
- Superior audio fidelity: Advanced codecs and ultralow latency deliver near-real-life call quality.
- Seamless experience: Data and voice services operate together without delay or handover interruptions.
- Support for advanced services: Speed and low latency enable native HD video calls and augmented reality (AR)-based communications, as well as future immersive experiences.
- No reliance on legacy networks: Operators can offer full voice services in a 5G-only environment.
VoNR is currently at an early deployment phase, and several chipsets do not yet support this feature. It also depends on full 5G SA coverage, which is not yet widely available.
VoLTE vs. VoNR: A Quick Comparison
| Feature | VoLTE (4G) | VoNR (5G) |
| Network | LTE | 5G stand-alone (SA) |
| Audio Quality | HD | Ultra HD and enhanced |
| Latency | Low | Very low |
| Video Call Support | Limited | Advanced, native |
| Dependency on Legacy | Possible fallback | None |
| Availability | Global, mature | Limited, expanding |
Where We Are Today with VoLTE and VoNR
Although many devices support 5G, voice calls often rely only on VoLTE. This is because most 5G networks operate in non-stand-alone (NSA) mode and are anchored to 4G for call control.
Only with broader stand-alone 5G deployments will VoNR become widely available. Early adopters, particularly in Asia and North America, are already offering VoNR. However, global coverage remains under development.
The Future of Mobile Voice
Voice is evolving into a fully IP-based, data-driven service.
It is no longer a stand-alone function but part of a broader ecosystem of digital communications, integrating:
- Applications
- Video
- Artificial intelligence (AI)
- AR
Our VoLTE- and VoNR-enabled modules provide reliable, high-quality voice services on modern mobile networks. With the continued expansion of 5G SA coverage, users can anticipate more integrated and sophisticated communication experiences. Voice, video and data services will converge to deliver seamless connectivity.
Partner with Telit Cinterion to unlock the full potential of mobile voice. Connect with our experts to explore our module portfolio and future-proof your communication solutions.
