What is Voice Over Wi-Fi (VoWiFi)? How does it Work?

Voice over Wi-Fi is a term generally used to describe the delivery of industrial telephony services utilizing Voice over IP technology from cellular devices connected over Wi-Fi. This is usually contrary to options, predominantly Voice over LTE, where a cellular network operator’s licensed spectrum is utilized to transmit packetized voice.

Voice over Wi-Fi Technology

Broadly speaking, VoWiFi language is delegated to each of core IMS services obtained from the unlicensed spectrum and over untrusted access infrastructures, like public Wi-Fi access factors. VoWiFi can be used synonymously to describe the GSMA permanent reference document IR.51: IMS Profile for voice, video, and SMS over untrusted Wi-Fi access.

Voice over Wi-Fi technology

While over the top cellular communications services can also employ Wi-Fi, wherever possible, to prevent utilizing a subscriber’s data plan, this isn’t commonly referred to as VoWiFi since these services aren’t closely integrated with an MNOs worldwide service offering and infrastructure.

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Voice over Wi-Fi Architecture

Implementing VoWiFi enables MNOs to easily and quickly expand their coverage or support scope without pricey radio access network infrastructure build-outs, investing in a new licensed spectrum or participating in complicated roaming agreements.

After the 3GPP reference structure defined inside the 3GPP’s TS 23.402, connectivity from the mobile handset into the developed packet core is within the S2b reference interface through an improved package data gateway function.

Voice over Wi-Fi Spec

The spec covers policy control, charging, authentication and handover between untrusted and trusted access infrastructures for both roaming and non-roaming scenarios. Outining a profile for encouraging voice, video, and SMS, IR.51 expands the requirements, comprehensive within IR.92 and IR.94 to include untrusted Wi-Fi access.

The PRD also stipulates using services from, an IMS core circuit switch calls continuity and fallback, per 3GPP TS 23.237. Services from, an IMS core essential info a cellular device needs to connect to, and get services from, an IMS core. In addition, the spec as well as the supported media types.

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How does it Work

Wi-Fi calling is the best example of VoWi-Fi. Wi-Fi Calling has been around for a long time. Voice calls were transmitted over Wi-Fi in either the shape of OTT applications like Skype or Skype as initiatives like UMA and femtocells to boost the range of mobile voice services in subscribers homes.

The problem with OTT applications in the operator’s viewpoint is the operator loses control. The UMA / femtocell initiatives turned out to be too pricey lacking widespread support among phone manufacturers. They’ve wanted to defend their voice-related revenue including revenue from roaming charges.

But new business models allowing for flat fee voice services, along with the realization that users will use OTT applications for calls like far as they could, has removed the last obstacle to making Wi-Fi Calling into the next degree.

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Wi-Fi Calling

Wi-Fi Calling is about indoor coverage. Wi-Fi is everywhere. Folks are already running the majority of their information through Wi-Fi. Based on a recent analysis by Mobidia just as much as 80 percent of all cellular data is going over Wi-Fi and a huge portion of this is, needless to say, internal traffic, including traffic from within people’s homes. This is the value proposition of the next generation of Wi-Fi calls, and it’s available today

Wi-Fi calling is the best example of Voice over Wi-Fi

In Sept 2014, mobile network operator T Mobile pioneered this next generation Wi-Fi Calling solution. That is a paradigm shift for wifi calling as it’s now implemented with native support built into the mobile phones and working through any Wi-Fi connection. Text messaging works in this way.

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VoWi-Fi vs VoLTE

Making matters worse, mobile networks are having an increasingly harder time penetrating modern buildings and people LTE networks operating on large frequency bands won’t make things easier for them.

What if you can use each the various Wi-Fi networks that users are connected to for hauling the voice calls that would ordinarily go over the mobile network? Suddenly mobile operators will be capable to give coverage of their voice services virtually everywhere where people spend most of their time.