Tag: Networking

Understanding the Architecture of Wi-Fi Calling (VoWiFi)

The Core Challenge of Wi-Fi Calling Architecture The fundamental problem at the heart of Wi-Fi Calling (VoWiFi) architecture is a complex integration challenge: How can a mobile network operator (MNO) securely and reliably route real-time, high-priority voice and SMS traffic from a subscriber’s device over an inherently untrusted, public internet connection back into the carrier’s… Read More Understanding the Architecture of Wi-Fi Calling (VoWiFi)

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Understanding the ALG (Application Layer Gateway) Settings of the TP-Link WiFi Router

1) What ALG is doing on this router Role on this router The TP-Link WiFi AX/BE Router is a typical IPv4 NAT gateway. Every LAN device shares one public address. The connection tracker can follow a normal TCP or UDP flow because the reply comes back to the same 5-tuple the router already recorded. Several… Read More Understanding the ALG (Application Layer Gateway) Settings of the TP-Link WiFi Router

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Configure the TP-Link WiFi Router settings to enable the Wi-Fi Calling (Voice over Wi-Fi)

Wi-Fi Calling is a carrier voice service that rides your home Wi-Fi instead of the cellular radio. On a TP-Link router it is not a single on/off switch: the phone and carrier must already support the feature, and the router must pass IPsec traffic to the carrier’s evolved packet data gateway (ePDG) without rewriting it.… Read More Configure the TP-Link WiFi Router settings to enable the Wi-Fi Calling (Voice over Wi-Fi)

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Wi-Fi Calling (VoWiFi) Explained and what a Home Router Must Pass for Wi-Fi Calling feature

Wi-Fi calling, formally Voice over Wi-Fi (VoWiFi), is a mobile-operator service that places and receives ordinary cellular voice calls—and usually SMS—over a Wi-Fi network instead of the licensed radio access network. The number, SIM identity, and billing relationship stay the same. The ambiguity worth clearing up is that “Wi-Fi calling” is a marketing name for… Read More Wi-Fi Calling (VoWiFi) Explained and what a Home Router Must Pass for Wi-Fi Calling feature

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Resolving VoIP Service Disruption When Using Custom DNS on Home Routers

The Architecture and Deployment Strategies of ISP-Managed VoIP Networks Executive Summary To understand why a simple DNS change breaks Voice over IP (VoIP) on a home network, one must first understand that Internet Service Providers (ISPs) do not treat VoIP as standard internet traffic. Unlike Over-The-Top (OTT) VoIP services (e.g., Skype, Vonage, Zoom), which operate… Read More Resolving VoIP Service Disruption When Using Custom DNS on Home Routers

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The role, enhancements, and practical applications of MIMO (Multiple-Input Multiple-Output) technology—in 3GPP Release 18

Release 18, frozen in functionality around late 2023 to mid-2024, marks the transition from foundational 5G New Radio (NR) to 5G-Advanced. MIMO has been a cornerstone of NR since Release 15; Rel-18 continues its evolution with targeted refinements rather than a wholesale redesign, focusing on higher spectral efficiency, better support for advanced devices, multi-TRP coordination,… Read More The role, enhancements, and practical applications of MIMO (Multiple-Input Multiple-Output) technology—in 3GPP Release 18

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