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News & Updates

Engineering deep-dives from the volte.io stack, plus product and company news.

Engineering

LoST and HELD emergency call routing: the IMS core retrieves the caller's location from a LIS via HELD and asks an ECRF via LoST which PSAP serves that place, delivering the emergency call to the right call taker

September 11, 2026

LoST and HELD: How an Emergency Call Finds the Right PSAP

Routing an ordinary call is a question about a number. Routing an emergency call is a question about a place. How HELD and LoST answer the two questions behind NG112 routing – and why a failed lookup must never fail the call.

ePDG update built for real devices and real operations: iPhone and Samsung handsets connecting over VoWiFi from home, office, and on the road through the volte.io ePDG and AAA server to the IMS core

September 4, 2026

ePDG Update: Built for Real Devices, Real Operations

Weeks of hardening against commercial handsets. EAP-only IKEv2 for operators without a certificate in the manufacturers’ trust stores, a datapath whose kernel footprint does not grow, and restarts that keep calls up.

August 21, 2026

Why VoLTE Does Not Work Without Rx or N5

One call on an idle cell proves signalling, not a voice service. Rx and N5 are how the IMS tells the radio that speech is in progress – without them, the busy hour is where the service fails.

EVS AMR-WB IO as the smart middle ground between AMR-WB HD Voice and full EVS super-wideband: better voice quality, broad interoperability, lower complexity, and a future-proof path through an EVS-IO-capable IMS core

July 24, 2026

EVS AMR-WB IO: The Underrated Middle Ground Between AMR-WB and Full EVS

Same bits on the wire, better everything around them: how EVS-IO delivers a more robust decoder on lossy links, mid-call codec agility without re-INVITEs, and transcoding-free interworking with the entire AMR-WB installed base.

Preconditions without the pain: comparison of end-to-end SIP preconditions versus volte.io terminating them at the P-CSCF, keeping any SIP application simple while VoLTE handsets get clip-free, ghost-ringing-free calls

July 15, 2026

Preconditions Without the Pain: Why We Terminate Them at the P-CSCF

A 25-year-old SIP mechanism nearly broke our promise of “connect any SIP application to IMS.” Why the P-CSCF is exactly the right place to terminate preconditions – and how it keeps integrating your app effortless.

3-way conference calling on VoLTE powered by RFC 4579, with participants connected through an IMS Core conference focus

June 24, 2026

Building a Conference Bridge That Actually Works: Our Journey to RFC 4579

Three-way calling sounds simple – until you build it inside a standards-compliant IMS. The story of our conferencing bridge, the MRF, and why RFC 4579 was non-negotiable.

Operating the volte.io ePDG at scale in Kubernetes: a LoadBalancer fronts multiple ePDG pods with session affinity, shared Redis-backed session state, and rolling upgrades coordinating with active VoWiFi sessions

May 20, 2026

Operating at Scale: The volte.io ePDG in Production

Part 4 of our ePDG series. From one working pod to a production fleet – shared state, LoadBalancer affinity, rolling upgrades, and what cloud-native really means for an IKE gateway.

The volte.io ePDG user plane: an ESP-encrypted packet from the UE is decrypted by the Linux kernel or NIC, policy-routed, and re-encapsulated into a GTP-U tunnel toward the PGW, with userspace kept out of the data path

May 11, 2026

Following a Packet: The User Plane in the volte.io ePDG

Part 3 of our ePDG series. Inside the data path: ESP decryption, policy routing, and GTP-U encapsulation in the Linux kernel – with userspace kept out of the fast path.

Bearer establishment in the volte.io ePDG: after EAP-AKA' authentication, S6b authorization to the AAA, S2b GTPv2-C session to the PGW, and IPsec Child SA installation in the Linux kernel

May 5, 2026

From Authentication to Connectivity: Bearer Establishment in the volte.io ePDG

Part 2 of our ePDG series. After authentication, what really happens before the first SIP REGISTER – S6b authorization, S2b bearer setup, and IPsec Child SAs in the kernel.

Production-ready ePDG for VoWiFi: UE over WiFi establishing a secure IPsec tunnel to the volte.io ePDG and IMS core with step-by-step subscriber authentication

April 24, 2026

From Feature to Foundation: Our Production-Ready ePDG

A year after launching VoWiFi, we rebuilt our ePDG from the ground up. Inside the new carrier-grade IPsec, EAP-AKA' authentication, and Kubernetes-native scaling.

Programmable IMS with Service Profiles: modular architecture with multi-vendor integration, per-subscriber customization, and AI-ready service chaining

April 10, 2026

Programmable IMS: Service Profiles That Turn Voice Into a Platform

Mix & match vendors, customize per subscriber, enable AI-driven services. Discover how 3GPP Service Profiles make your IMS core programmable.

Continuous verification diagram showing baseline traffic monitoring with automatic cloud scaling and built-in test agents

April 1, 2026

Continuous Verification: Why Built-In Automated Testing Changes Everything

Your network should prove it works – every minute, automatically. Discover how built-in end-to-end test agents replace legacy probing and transform operational confidence.

Hybrid cloud bursting diagram showing bare-metal to public cloud scaling

February 26, 2026

Hybrid Cloud Bursting: The Future of Cost-Efficient Mobile Networks

Run baseline traffic on bare-metal, burst into AWS, GCP, or Hetzner for peaks. Cut hosting costs by up to 80% with dynamic cloud scaling.

December 1, 2025

IPSec NAT Traversal in IMS: Why 3GPP TS 33.203 Annex M Matters

How NAT-T enables horizontal scalability in Kubernetes and why SmartNIC offload transforms cloud-native IMS performance.

99.95% availability gauge for MVNO and private LTE/5G networks

March 18, 2026

Why 99.95% Availability Is the Right Target for MVNOs

Five nines is a legacy benchmark. For MVNOs and private networks, 99.9%–99.95% delivers the right balance of resilience, simplicity, and cost.

February 19, 2026

MWC 2026: Shaping the Future of Connectivity in Barcelona

Meet volte.io at Mobile World Congress 2026. Let's discuss IMS, VoLTE, VoWiFi, and next-gen voice services.

November 21, 2025

VoWifi Support with ePDG Now Available

We're excited to announce the launch of our ePDG solution, enabling seamless Voice over WiFi capabilities for enhanced indoor coverage.

October 15, 2025

5G Core Integration – Full SA Support

Our platform now offers complete 5G Standalone core network integration, enabling operators to deploy next-gen networks.

September 8, 2025

Multi-Cloud Deployment Options

Deploy volte.io on any major cloud platform or on-premises. Full flexibility with our Kubernetes-native architecture.

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