As Wi-Fi calls come to smartphones, networks get ready to carry them

Software features from Ruckus Wireless are designed to help access points better handle voice calls

Wi-Fi may carry many voice calls within the next few years, but the technology required to make those calls is still young in some ways.

Mobile subscribers have been talking and doing video chats over Wi-Fi for a long time using Internet-based services such as Skype. Now carriers are offering ways to call up friends and family over wireless LANs using their regular phone numbers.

Wi-Fi calling made a splash last year when the iPhone 6 came out with the capability, though a number of Android and other devices also have it. T-Mobile USA and Sprint both allow Wi-Fi calling with selected smartphones. AT&T and Verizon, as well as EE in the UK, plan to follow.

Wi-Fi home networks and hotspots have become critical tools for carriers to keep up with growing mobile data use. The fat unlicensed spectrum bands available with Wi-Fi can carry bits that would otherwise have to ride on carriers' own frequencies. Adding voice calls to the mix can take more of the load off licensed spectrum, and even improve at-home coverage, but this traffic may need special treatment to meet our expectations of what a phone call should sound like.

Early deployments sometimes fell short, according to Ovum analyst Daryl Schoolar. Late last year, EE told subscribers it had pushed back its Wi-Fi calling launch to make sure the experience meets subscribers' expectations.

"The Nirvana that we want to reach is, when you make a call you don't really know what technology you're using," Farpoint Group analyst Craig Mathias said. That may be a ways off for Wi-Fi calling, because the technology has only begun to be used on a large scale, he said. It will probably become generally available in the next two to three years, Mathias said.

Some of the steps to making Wi-Fi voice work more like any other call will take place behind the hotspot. For example, turning cellular calls into data using VoLTE (voice over LTE) should let carriers put both types of calls under the same management software on the back-end network. That could make it more seamless for subscribers to talk on Wi-Fi networks, Ovum analyst Schoolar said.

Ruckus Wireless, which makes the APs (access points) that go into carrier hotspots as well as hotels and enterprises, is working to improve Wi-Fi calling at the other end. Software that Ruckus announced on Monday for its ZoneFlex APs can improve how they deal with voice traffic and with multiple smartphones trying to connect at the same time. Among other things, the software can identify and prioritize voice, keep an access point from getting overloaded and provide automatic roaming to a better AP.

In some cases, a Ruckus AP will make the caller's smartphone ask for as much bandwidth as it would need to carry out a call and won't let it connect if it can't get that much. The software can also turn away additional callers if the AP doesn't have enough capacity left to serve them all well. That doesn't necessarily mean those callers are stranded: Ruckus will also provide roaming capability, based on the IEEE 802.11v standard, to send a user to another nearby AP that has the free capacity to serve them.

The software features will only work on Ruckus APs. They will become available over the course of this year.

Ruckus will demonstrate the software features at Mobile World Congress next month in Barcelona, where there is likely to be other news on the spread of Wi-Fi calling. Verizon, AT&T and EE all have said they plan to launch Wi-Fi calling this year.

Stephen Lawson covers mobile, storage and networking technologies for The IDG News Service. Follow Stephen on Twitter at @sdlawsonmedia. Stephen's e-mail address is

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Tags telephonytelecommunicationNetworkingwirelesssprint nextelmobileWLANs / Wi-FiT-Mobile USARuckus WirelessVerizon WirelessCarriersat&t

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Stephen Lawson

IDG News Service
Show Comments

Cool Tech

Crucial Ballistix Elite 32GB Kit (4 x 8GB) DDR4-3000 UDIMM

Learn more >

Gadgets & Things

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Family Friendly

Lexar® JumpDrive® S57 USB 3.0 flash drive 

Learn more >

Stocking Stuffer

Plox Star Wars Death Star Levitating Bluetooth Speaker

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest News Articles


GGG Evaluation Team

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott


My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?