VoLTE: Voice beyond the phone call?

Introduction

Telephony is still necessary in the 4G era

Some people in the telecom industry believe that “voice is dead” – or, at least, that traditional phone calls are dying off. Famously, many younger mobile users eschew standalone realtime communications, instead preferring messaging loaded with images and emoji, via apps such as Facebook Messenger and WeChat, or those embedded e.g. in online gaming applications. At the other end of the spectrum, various forms of video-based communications are important, such as SnapChat’s disappearing video stories, as well as other services such as Skype and FaceTime.

Even for basic calling-type access, WhatsApp and Viber have grown huge, while assorted enterprise UC/UCaaS services such as Skype for Business and RingCentral are often “owning” the business customer base. Other instances of voice (and messaging and video) are appearing as secondary features “inside” other applications – games, social networks, enterprise collaboration, mobile apps and more – often enabled by the WebRTC standard and assorted platforms-as-a-service.

Smartphones and the advent of 4G have accelerated all these trends – although 3G networks have seen them as well, especially for messaging in developing markets. Yet despite the broad uptake of Internet-based messaging and voice/video applications, it is still important for mobile operators to provide “boring old phone calls” for mobile handset subscribers, not least in order to enable “ubiquitous connection” to friends, family and businesses – plus also emergency calls. Plenty of businesses still rely on the phone – and normal phone numbers as identifiers – from banks to doctors’ practices. Many of the VoIP services can “fall back” to normal telephony, or dial out (or in) from the traditional telco network. Many license terms mandate provision of voice capability.

This is true for both fixed and mobile users – and despite the threat of reaching “peak telephony”, there is a long and mostly-stable tail of calling that won’t be displaced for years, if ever.

Figure 1: Various markets are beyond “peak telephony” despite lower call costs

Source: Disruptive Analysis, National Regulators

In other words, even if usage and revenues are falling, telcos – and especially mobile operators – need to keep Alexander Graham Bell’s 140-year legacy alive. If the network transitions to 4G and all-IP, then the telephony service needs to do so as well – ideally with feature-parity and conformance to all the legacy laws and regulation.

(As a quick aside, it is worth noting that telephony is only one sort of “voice communication”, although people often use the terms synonymously. Other voice use-cases vary from conferencing, push-to-talk, audio captioning for the blind, voice-assistants like Siri and Alexa, karaoke, secure encrypted calls and even medical-diagnostics apps that monitor breathing noise. We discuss the relevance of non-telephony voice services for telcos later in this report).

4G phone calls: what are the options?

  • CSFB (Circuit-Switched Fallback): The connection temporarily drops from 4G, down to 3G or 2G. This enables a traditional non-IP (CS – circuit-switched) call to be made or received on a 4G phone. This is the way most LTE subscribers access telephony today.
  • VoLTE: This is a “pure” 4G phone call, made using the phone’s in-built dialler, the cellular IP connection and tightly-managed connectivity with prioritisation of voice packets, to ensure good QoS. It hooks into the telco’s IMS core network, from where it can either be directly connected to the other party (end-to-end over IP), go via a transit provider or exchange, or else it can interwork with the historic circuit-based phone network.
  • App-based calling: This involves making a VoIP call over the normal, best-efforts, data connection. The function could be provided by a telco itself (eg Reliance Jio’s 4GVoice app), an enterprise UC provider, or an Internet application like Skype or Viber. Increasingly, these applications are also integrated into phones “native dialler” interface and can share call-logs and other functions. [Note – STL’s Future of The Network research stream does not use the pejorative, obsolete and inaccurate term “OTT”.]

None of these three options is perfect.

Content:

  • Executive Summary
  • Introduction
  • Telephony is still necessary in the 4G era
  • 4G phone calls: what are the options?
  • The history of VoLTE
  • The Good, the Bad & the Ugly
  • The motivations for VoLTE deployment
  • The problems for VoLTE deployment?
  • Industry politics
  • Market Status & Forecasts
  • Business & Strategic Implications
  • Is VoLTE really just “ToLTE”?
  • Link to NFV & Cloud
  • GSMA Universal Profile: Heaven or Hell for Telcos?
  • Do telcos have a role in video communications?
  • Intersection with enterprise voice
  • Conclusions
  • Recommendations

Figures:

  • Figure 1: Various markets are beyond “peak telephony” despite lower call costs
  • Figure 2: VoLTE, mobile VoIP & LTE timeline
  • Figure 3: VoLTE coverage is often deployed progressively
  • Figure 4: LTE subscribers, by voice technology, 2009-2021

The Future Value of Voice and Messaging

Background – ‘Voice and Messaging 2.0’

This is the latest report in our analysis of developments and strategies in the field of voice and messaging services over the past seven years. In 2007/8 we predicted the current decline in telco provided services in Voice & Messaging 2.0 “What to learn from – and how to compete with – Internet Communications Services”, further articulated strategic options in Dealing with the ‘Disruptors’: Google, Apple, Facebook, Microsoft/Skype and Amazon in 2011, and more recently published initial forecasts in European Mobile: The Future’s not Bright, it’s Brutal. We have also looked in depth at enterprise communications opportunities, for example in Enterprise Voice 2.0: Ecosystem, Species and Strategies, and trends in consumer behaviour, for example in The Digital Generation: Introducing the Participation Imperative Framework.  For more on these reports and all of our other research on this subject please see here.

The New Report


This report provides an independent and holistic view of voice and messaging market, looking in detail at trends, drivers and detailed forecasts, the latest developments, and the opportunities for all players involved. The analysis will save valuable time, effort and money by providing more realistic forecasts of future potential, and a fast-track to developing and / or benchmarking a leading-edge strategy and approach in digital communications. It contains

  • Our independent, external market-level forecasts of voice and messaging in 9 selected markets (US, Canada, France, Germany, Spain, UK, Italy, Singapore, Taiwan).
  • Best practice and leading-edge strategies in the design and delivery of new voice and messaging services (leading to higher customer satisfaction and lower churn).
  • The factors that will drive best and worst case performance.
  • The intentions, strategies, strengths and weaknesses of formerly adjacent players now taking an active role in the V&M market (e.g. Microsoft)
  • Case studies of Enterprise Voice applications including Twilio and Unified Communications solutions such as Microsoft Office 365
  • Case studies of Telco OTT Consumer Voice and Messaging services such as like Telefonica’s TuGo
  • Lessons from case studies of leading-edge new voice and messaging applications globally such as Whatsapp, KakaoTalk and other so-called ‘Over The Top’ (OTT) Players


It comprises a 18 page executive summary, 260 pages and 163 figures – full details below. Prices on application – please email contact@telco2.net or call +44 (0) 207 247 5003.

Benefits of the Report to Telcos, Technology Companies and Partners, and Investors


For a telco, this strategy report:

  • Describes and analyses the strategies that can make the difference between best and worst case performance, worth $80bn (or +/-20% revenues) in the 9 markets we analysed.
  • Externally benchmarks internal revenue forecasts for voice and messaging, leading to more realistic assumptions, targets, decisions, and better alignment of internal (e.g. board) and external (e.g. shareholder) expectations, and thereby potentially saving money and improving contributions.
  • Can help improve decisions on voice and messaging services investments, and provides valuable insight into the design of effective and attractive new services.
  • Enables more informed decisions on partner vs competitor status of non-traditional players in the V&M space with new business models, and thereby produce better / more sustainable future strategies.
  • Evaluates the attractiveness of developing and/or providing partner Unified Communication services in the Enterprise market, and ‘Telco OTT’ services for consumers.
  • Shows how to create a valuable and realistic new role for Voice and Messaging services in its portfolio, and thereby optimise its returns on assets and capabilities


For other players including technology and Internet companies, and telco technology vendors

  • The report provides independent market insight on how telcos and other players will be seeking to optimise $ multi-billion revenues from voice and messaging, including new revenue streams in some areas.
  • As a potential partner, the report will provide a fast-track to guide product and business development decisions to meet the needs of telcos (and others).
  • As a potential competitor, the report will save time and improve the quality of competitor insight by giving strategic insights into the objectives and strategies that telcos will be pursuing.


For investors, it will:

  • Improve investment decisions and strategies returning shareholder value by improving the quality of insight on forecasts and the outlook for telcos and other technology players active in voice and messaging.
  • Save vital time and effort by accelerating decision making and investment decisions.
  • Help them better understand and evaluate the needs, goals and key strategies of key telcos and their partners / competitors


The Future Value of Voice: Report Content Summary

  • Executive Summary. (18 pages outlining the opportunity and key strategic options)
  • Introduction. Disruption and transformation, voice vs. telephony, and scope.
  • The Transition in User Behaviour. Global psychological, social, pricing and segment drivers, and the changing needs of consumer and enterprise markets.
  • What now makes a winning Value Proposition? The fall of telephony, the value of time vs telephony, presence, Online Service Provider (OSP) competition, operators’ responses, free telco offerings, re-imaging customer service, voice developers, the changing telephony business model.
  • Market Trends and other Forecast Drivers. Model and forecast methodology and assumptions, general observations and drivers, ‘Peak Telephony/SMS’, fragmentation, macro-economic issues, competitive and regulatory pressures, handset subsidies.
  • Country-by-Country Analysis. Overview of national markets. Forecast and analysis of: UK, Germany, France, Italy, Spain, Taiwan, Singapore, Canada, US, other markets, summary and conclusions.
  • Technology: Products and Vendors’ Approaches. Unified Comminications. Microsoft Office 365, Skype, Cisco, Google, WebRTC, Rich Communications Service (RCS), Broadsoft, Twilio, Tropo, Voxeo, Hypervoice, Calltrunk, Operator voice and messaging services, summary and conclusions.
  • Telco Case Studies. Vodafone 360, One Net and RED, Telefonica Digital, Tu Me, Tu Go, Bluvia and AT&T.
  • Summary and Conclusions. Consumer, enterprise, technology and Telco OTT.