VoWiFi Solution for
Seamless Wi-Fi Calling

VoWiFi, or Voice over Wi-Fi, enables mobile subscribers to make and receive voice services over a Wi-Fi connection instead of relying only on cellular radio access. In an operator network, VoWiFi typically works with the existing IMS core and uses secure connectivity between the subscriber device and the mobile core network to provide voice and messaging services over Wi-Fi.

VoWiFi can help operators extend voice coverage into locations where cellular indoor coverage is limited, such as buildings, offices, basements, and other challenging environments. It can also provide subscribers with an additional access network for voice services while allowing operators to leverage their existing IMS and core network infrastructure.

Yes. VoWiFi can be integrated into an operator's existing mobile core and IMS architecture. The required deployment depends on the operator's current EPC, 5G Core, IMS, subscriber database, security architecture, and device capabilities. A project assessment should therefore consider the existing network interfaces and service architecture before deployment.

A typical VoWiFi architecture involves the subscriber device, Wi-Fi access network, secure connectivity toward the mobile core, and the operator's IMS and subscriber service infrastructure. Depending on the architecture, components such as ePDG, AAA, IMS, HSS/UDM, and related 4G/5G core network functions may be involved.

VoWiFi can be incorporated into a broader network evolution strategy that includes LTE/EPC and 5G Core environments. The specific architecture depends on the operator's migration path, IMS deployment, subscriber management, and whether services are delivered through EPC, 5G Core, or a converged core environment.

VoWiFi uses IMS to provide IP-based voice and multimedia services over Wi-Fi. The Wi-Fi access path connects the subscriber securely to the mobile operator's core network, after which IMS handles service registration, session control, and voice service delivery. This allows operators to maintain a common service architecture across supported access networks.

Operators should evaluate Wi-Fi coverage and quality, device compatibility, IMS readiness, subscriber authentication, security, IP addressing, existing EPC or 5G Core architecture, regulatory requirements, and interoperability with other network elements. Capacity and redundancy should also be considered when VoWiFi is intended for large subscriber populations or nationwide deployment.

Yes. VoWiFi deployment requirements vary significantly between MNOs, MVNOs, private networks, and different core network architectures. IPLOOK can evaluate the existing network environment and determine the appropriate core network, IMS, security, subscriber management, and integration components required for the target VoWiFi deployment.