WiFi Calling is rapidly becoming a must-have feature for mobile network operators that want to improve indoor coverage, reduce churn, and compete with OTT apps. Instead of relying only on radio access, WiFi Calling (Voice over WiFi / VoWiFi) lets subscribers make and receive regular mobile calls over any WiFi network using the native device dialer. The result is better voice quality indoors, especially in homes, offices, and high‑rise buildings where cellular coverage is weak.
For operators, the ability to deliver carrier-grade WiFi Calling is now a key differentiator. It extends mobile voice coverage without building new cell sites and helps win back customers who have shifted to over-the-top communication apps. This is where Alepo’s 3GPP AAA plays a central role.
What is WiFi Calling and Why Operators Need it
With WiFi Calling, subscribers dial and receive calls exactly as they do today, same mobile number, same dialer, same billing relationship with their operator. The difference is in the underlying technology: when the mobile signal is poor but WiFi is available, the device routes the call securely over WiFi.
Key benefits for mobile operators include:
- Extended indoor coverage without deploying new base stations
- Improved voice quality in buildings and dense urban areas
- Lower churn, by solving a primary complaint: poor indoor voice service
- Reduced dependency on OTT apps, keeping calls and revenues on the operator’s network
By turning any suitable WiFi network into a natural extension of the mobile core, WiFi Calling delivers a better mobile voice experience at a lower total cost.
Alepo 3GPP AAA: Enabling Secure, Carrier-Grade WiFi Calling
Alepo provides a 3GPP-compliant AAA (Authentication, Authorization, and Accounting) platform that sits at the heart of a robust WiFi Calling solution. It securely connects non‑3GPP access networks (like WiFi) to the operator’s EPC and IMS, ensuring that WiFi Calling is as secure, consistent, and manageable as traditional cellular voice.
Alepo 3GPP AAA:
- Authenticates subscribers over WiFi using 3GPP interfaces such as
SWx,S6b,SWm,SWa, andSTa - Integrates seamlessly with HSS, PGW, ePDG, and IMS for end‑to‑end VoWiFi
- Supports both trusted and untrusted WiFi access in a standards-compliant way
- Delivers centralized policy, security, and charging for WiFi Calling sessions
Because Alepo’s solution is access‑agnostic and vendor‑neutral, it works with multiple ePDG, TWAG, and core network vendors, making it easier for operators to deploy WiFi Calling alongside existing LTE and VoLTE infrastructure.
Telefonica Colombia: Real-World WiFi Calling Success
Telefónica Colombia selected Alepo 3GPP AAA to enable WiFi Calling over any WiFi network using the phone’s native dialer. Subscribers no longer need to install separate OTT voice apps to get acceptable voice quality indoors. Instead, they can rely on their mobile operator’s own VoWiFi service for clearer calls at home, at work, and in public hotspots.
By leveraging Alepo’s WiFi Calling solution, Telefónica Colombia directly addresses a major source of churn: indoor voice quality dissatisfaction. The deployment helps solve approximately 60% of indoor voice quality issues that drive subscribers to switch operators, significantly improving customer satisfaction and loyalty.
Business Impact of Alepo’s WiFi Calling Solution
For mobile operators seeking a future-proof voice strategy, Alepo’s WiFi Calling and 3GPP AAA platform delivers:
- Better indoor coverage and call quality, using existing WiFi
- Churn reduction, by fixing a top customer pain point
- Stronger position against OTT competitors, with seamless voice over any IP
- Smooth handover between VoWiFi and VoLTE, where supported
- Lower CAPEX and OPEX, thanks to software-based, highly scalable AAA
Redefining Mobile Voice in the WiFi Era
As subscriber expectations evolve, WiFi Calling is no longer a niche feature, it is essential for delivering high‑quality, ubiquitous mobile voice services. With Alepo 3GPP AAA, operators gain a secure, standards-based, and scalable way to deploy WiFi Calling, extend indoor coverage, and reduce churn. The Telefónica Colombia deployment clearly demonstrates how a well-implemented VoWiFi solution can transform the customer experience and protect revenue in the mobile era.
Also Read: Native WiFi Calling Gaining Ground on OTT Calling
FAQs
WiFi Calling lets mobile subscribers make and receive regular mobile calls over any WiFi network using the phone’s native dialer. With Alepo’s 3GPP AAA, operators such as Telefónica Colombia deliver secure, carrier-grade Voice over WiFi that improves indoor coverage, reduces churn, and removes the need for OTT calling apps.
FAQ 1: What is WiFi Calling?
WiFi Calling (Voice over WiFi or VoWiFi) is a service that routes mobile voice calls over a WiFi network instead of the cellular network, while still using the same mobile number and native device dialer.
FAQ 2: How does Alepo 3GPP AAA enable WiFi Calling?
Alepo 3GPP AAA securely connects WiFi access to the operator’s core network and IMS, authenticating subscribers, enforcing policies, and managing charging so WiFi Calling works like any other carrier-grade voice service.
FAQ 3: Why is WiFi Calling important for mobile operators?
WiFi Calling helps operators extend indoor coverage, improve voice quality, reduce churn, and compete with OTT apps by delivering high-quality voice over any available WiFi connection.
FAQ 4: How did Telefónica Colombia benefit from Alepo’s WiFi Calling solution?
By deploying WiFi Calling with Alepo 3GPP AAA, Telefónica Colombia addressed roughly 60% of indoor voice quality dissatisfaction that drives churn, enabling better indoor call quality without deploying new cell sites.
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