(OK, it's not strictly Telco related, but check the footnote to see my personal connection with the J9 VM in particular)
WebSphere Liberty is the high performance Java Enterprise Edition Server that's ultra light-weight - it includes and OSGi container and uses the IBM J9 VM at it's core - which IBM has also donated to the Open source community (via Eclipse - see https://projects.eclipse.org/projects/technology.openj9) .1
1. A little history lesson on the IBM J9 VM - it was originally developed by IBM's (now defunct) Pervasive Computing division for IBM's J2ME lightweight VM. It was then ported to the J2SE and J2EE platforms. When it was developed, I was in a Tech Sales role for the Pervasive Computing division, so I have a soft spot for the J9 VM.
An ex-colleague of mine (Violet Le - now the Marketing Director at Imageware) asked me about the drivers for Analytics in Telcos. I'll admit that it's a subject that I haven't really given a lot of thought to - all the projects that I've worked on in the past that have included Analytics have had a larger business case that I was trying to solve... Marketing, Future Planning, Sales etc I've never worked on an Analytics project for the sake of analytics, nor have I designed a solution that was just (or mainly) analytics.
There is a definite value in analytics in providing an insight into how the business is running - to enable business to plan for the future and to manage how they run in the present. Both Strategic and Tactical cases for analytics would seem to me to be of value to any business. An analytics system that delivers insight into the business (customer behaviour, sales effectiveness, capacity usage and predictions etc) is great, but at the end of the day, a Telco needs to do something about that information/insight to actually deliver business benefits.
As I'm no analytics specialist, I wont' try to describe how to define or build those systems. What I will try to do is to describe the bits around the analytics systems that make use of that insight to deliver real value for the CSP.
What are the business cases that I've seen?
Sales & Marketing
Driving promotions to to positively affect subscriber retention or acquisition... I did a project with Globe Telecom in the Philippines which was primarily aimed at driving SMS based outbound marketing promotions that are targeting based on subscriber behaviour. An example might be if a subscriber had a pre-paid balance less than (say) 5 pesos, and the subscriber topped up more than 20 pesos and less than 50 pesos, then send a promo encouraging the subscriber to top up by more than 100 pesos... all the interaction is via SMS (via a ParlayX SMS API)
Back in 2013, I did an Ignite presentation at the IBM Impact Conference in Las Vegas - Here is the presentation (Smarter Marketing for Telecom - Impact 2013) The session was videoed, however, the video recording is no longer on Youtube. Happily, I've found the video is still available - just not easy to find. Here it is for your enjoyment!
Social networking analysis to determining who should be targeted. IBM's Research group was pushing for years a Social Networking Analysis capability that looked at Social Networking connection to determine which subscribers are followers, which are community leaders and influencers and based on that assessment.
Ensuring utilisation of the network is optimised for the load requirements. I worked with a telco in Hong Kong that wanted to dynamically adjust the quality of service level to be delivered to a specific user based on their location (in real time) and a historical analysis of the traffic on the network. For example, if a subscriber was entering the MTR (subway) station and the analytics showed that particular station typically got very high numbers of subscribers all watching youtube clips at that time of day on that day of the week, then lower the QoS setting for that subscriber UNLESS they were a premium or post-paid customer in which case, keep the QoS settings the same. The rating as a premium subscriber could be derived from their past behaviour and spend - from a traditional analytics engine.
Long term planning on network (SDN/NFV will allow Networks to be more agile which will reduce the need for traditional offline analytics to drive network planning and make the real time view more relevant as networks adapt to real time loads dynamically ... as traffic increases in particular sections of the network, real time analytics and predictions will drive the SDN to scale up that part of the network on demand. This is where new next gen AI's may be useful in predicting where the load will be int he network and then using SDN to increase capacity BEFORE the load is detected... read Watson from IBM and similar....
A few years ago, a number of ex colleagues (from IBM) formed a company on the back of real time marketing use case for Telcos and since then, they've gone ahead in leaps and bounds. (Check them out if you're interested, the company name is Knowesis) <edit> Unfortunately, I can't link to them without setting off the spam protections on mydeveloperworks, but I'm sure you can figure it out... www.knowesis.com will do it!</edit>
Do you have significant use cases for analytics in a CSP? I'm sure they are and I'm not claiming this is an exhaustive list - merely the cases that I've seen multiple times in my time as a solution architect focused on the telecommunications industry.
I wouldn't normally just post a link to someone else's work here, but in this case Frank Wong - a colleague of mine at my new company (DGit Systems) has done some terrific work in helping to eliminate the miss-match between the data model used by the TMF's REST based APIs and the TMF's Information Model (SID). I know this was an issue that IBM were also looking to resolve. In the effort to encourage the use of a simple REST interface, the data model used in the TMF's APIs has been greatly simplified from the comprehensive (some might say complex) data model that is the TMF's Information Model (SID). This meant that a CSP who is using the SID internally to connect internal systems needed to map to the simplified API data model to expose those APIs externally - there was no easy one-to-one mapping for that mapping which meant that the one could not simply create a API for an existing business service (eTOM or otherwise) - a lot more custom data modelling work would be required.
Across many industries, including the Telecommunications sector, there seems to be a strong movement towards a MicroServices Architecture and (somewhat) away from Service Oriented Architecture. I've seen this move in a CSP here in Australia. The TeleManagement Forum have a significant project that is trying to standardise the REST APIs that a CSP might publish.
The TMF state:
"TM Forum’s Open API program is a global initiative to enable end to end seamless connectivity, interoperability and portability across complex ecosystem based services. The program is creating an Open API suite which is a set of standard REST based APIs enabling rapid, repeatable, and flexible integration among operations and management systems, making it easier to create, build and operate complex innovative services.
"TM Forum is bringing different stakeholders from across industries to work together and build key partnerships to create the APIs and connections. The reference architecture and APIs we are co-creating are critical enablers of our API program and open innovation approach for building innovative new digital services in a number of key areas, including IoT applications, smart cities, mobile banking and more."
Laurent Leboucher, Vice President of APIs & Ecosystems, Orange
TM Forum REST based APIs are technology agnostic and can be used in any digital service scenario, including B2B value fabrics, Internet of Things, Smart Health, Smart Grid, Big Data, NFV, Next Generation OSS/BSS and much more."
I've been a part of a number of projects where these REST APIs have been exposed primarily to a CSPs trading partners - my very first Service Delivery Platform exposed APIs to external developers. Back then, it was Parlay X Web services (REST didn't really exist and certainly there to external developers.were no Telco standards in place for REST based interfaces) that exposed the functionality of network elements to 3rd party developers. With many of the APIs that the TMF have defined, they seem to be more focused on OSS/BSS functions instead. Now that the TMF have quite a number of Open APIs defined, there are some network focused APIs that are coming onto the list - for instance, a Location API would have typically be exposed using the ParlayX Web Services or ParlayREST REST interfaces to the network's Location Based Server (LBS). As a result, there does seem to be a small amount of crossover between the new TMF APIs and the older ParlayREST APIs.
Does this mean that the new TMF OpenAPIs are of no use? Not at all. There are certainly advantages to exposing functions that a CSP has to external developers and REST based OpenAPIs make the consumption of those functions easier than the ParlayX web services or Parlay CORBA services have been in the past. Ease of consumption is not to be underestimated. An API that is easy to include in an application and provides a real capability that would have been otherwise difficult to provide stands a much greater chance of wide usage.
Sure, there is a place for externalising the OSS/BSS functions of a CSP. Trading partners could place orders against a CSP, they could bill to a subscriber's post or pre-paid accounts, they could update the subscriber profile held by the CSP. All relevant use cases for externalising the TMF Open APIs.
The big question in my mind is will REST APIs be of use internally?
REST based APIs being easier to integrate internally will drive some value. But in CSPs that have significant investments in a Service Oriented Architecture (SOA), I'm struggling to see the business value in abandoning that in favour of a MicroServices Architecture where there is no common integration tool, no common orchestration capability, rather lots and lots of point to point integrations through REST APIs.
For those of us that have been around a while, you will have seen point to point integrations and the headaches they cause - complex dependencies in mesh architectures make maintenance hard and expensive. Changing a (say) billing system that is integrated through multiple point to point connections is a nightmare - even if they have a standardised API describing those interfaces. The plane truth of the matter is that not all of those interfaces will be adequately described by the TMF's Open APIs, so custom specifications APIs will arise and make swapping out the billing system expensive. Additionally, not all of a CSPs internal systems will have TMF Open API compliant interfaces - many won't even support REST interfaces natively. Changing all of a CSP's systems to ensure they have a REST interface is a non-trivial task.
A Hybrid environment may be needed.
I'd suggest that a Hybrid approach is needed - existing Enterprise Service Busses may be able to interface with REST APIs - certainly IBM's Integration Bus and the (now superseded) WebSphere Enterprise Service Bus could connect to REST APIs just as easily as they could connect to Web Services, Files and other connectivity options. The protocol transformation capabilities of a ESB are able to provide REST APIs to systems that would have otherwise not supported such modern interfaces. Similarly, where a function is not provided by a single system, a traditional orchestration (BPM) capability can coordinate multiple systems to provide a single interface to that capability even if (behind the scenes) there are multiple end point systems involved in providing the functionality of that transaction/interface. The diagram below shows my thinking of what should be in place....
Think about it - orchestration is everywhere in a Telco - the Order to Cash process, The Ticket to Resolution process, the service and resource fulfilment process and even the NFV MANO processes. Orchestration is everywhere...
There is a hierarchy to processes in a Telco - just as the TMF recognises that there is a hierarchy in business services (within the eTOM Process Framework). At the highest level, the Order to Cash process might look like this:
Each task in this swimlane diagram will have multiple sub-processes. If we delve down into the provision resources task for instance, a CSP will need processes that will interrogate the resource catalog and network inventory to determine where in the network that resource can be put and what characteristics need to be set, then tell the resource manager to provision that resource. If it's a physical resource, that may involve allocating a technician to install the physical resource. If it's a virtual resource such as a Virtual Network Function (VNF) then the Network Function Virtualisation (NFV) orchestration engine will need to be told to provision that VNF. If we go one level deeper, the NFV Orchestration engine will need to tell the NFV Manager to provision that VNF and then update the network inventory.
Perhaps the diagram below will help you to understand what i mean:
This diagram is a very simplified hierarchical process model designed to show the layers of process. As you can see, there are many layers of orchestration required in a CSP and as long as the orchestration engine is flexible enough and can handle the integration points with the many systems it needs to interact with, there is no real reason why the same orchestration engine couldn't be used by all levels of process.
Over the past couple of years as NFV has risen significantly in popularity and interest, I've seen many players in the market talk about orchestration engines that just handle NFV orchestration and nothing else. To me, that seems like a waste. Why put in an orchestration engine that is just used for NFV when you also still need orchestration engines for the higher process layers as well? I'd suggest that a common orchestration and common integration capability makes the most sense delivering:
High levels of reuse
Maximising utilisation of software capabilities
Common Admin and Development skills for all levels of process (be they business focussed or service or resource focussed)
Common Integration patterns (enabling developers and management staff to work across all layers of the business)
Greater Business Agility - able to react to changing business and technical conditions faster
There are a number of Integration platforms - typically marketed as Enterprise Service Buses (ESB) that can handle integration through Web Services, XML/HTTP, File, CORBA/IIOP even Socket/RPC connections for those legacy systems that many telcos still have hanging around. An ESB can work well in a MicroServices environment too - so don't think that just because you have a ESB, you're fighting against MicroServices - you are not. MicroServices can make use of the ESB for connectivity to conventional Web Services (SOA) as well as legacy systems.
A common Orchestration layer would drive consistency in processes at all layers of a Telco - and there are a number of Business Process Management orchestration engines out there that have the flexibility to work with the Integration layer to orchestrate processes from the lowest level (such as within a Network Function Virtualisation (NFV) environment) all the way up to the highest levels of business process - the orchestrations should be defined in an standard language such as Business Process Execution Language (BPEL) or Business Process Model Notation (BPMN).
To me, it makes no sense to re-invent the wheel and have orchestration engines just for the NFV environment, different orchestration engines for the Service Order Management, the Resource Order Management, the Customer Order Management, the Service Assurance, the Billing, the Partner/Supplier management etc etc - all of these orchestration requirements could be handled by a single orchestration engine. Additionally, this would make disaster recovery simpler and faster and cheaper as well (fewer software components to be restored in a disaster situation).
A link to this blog entry popped up in my LinkedIn feed today which in turn linked to a Developerworks article - Combine business process management and blockchain which steps you though a use case and allows you to build your own basic BPM & Blockchain demo. Complex processes could save and get data to/from Blockchain ensuring that every process in any organisation (within the same company and across company boundaries) are using the most up to date data.
I thought it would be appropriate to paste in a link given my previous post on Blockchain in Telcos. As I think about this topic more, I can see a few more use cases in Telecom. I'll explore them in subsequent posts, but for now, I think it's important that we be pragmatic about this. Re-engineering processes to make good use of blockchain is non-trivial and therefore will have a cost associated with it. Will the advantages in transparency and resilience be worth the cost of making the changes? Speaking about resilience, don't forget the damage that a failure can cause. British Airways IT system failure (which I believe is outsourced but I cannot be sure) was down for the better part of three days - failures like that have the potential to bring down a business. We don't know yet what will happen to BA in the long term, but you certainly don't want the same sort of failure happing ing to your business.
If you like me are hearing 'Blockchain this, blockchain that', it almost seems like blockchain will solve world peace, global hunger and feed your pets for you! We're obviously at the 'peak of inflated expectations' of the Gartner hype cycle.
I saw a tweet yesterday from an ex-colleague at IBM yesterday that spoke about using blockchain to combat fraud in a Telco. While I can see that as a possible use case, I was thinking about other opportunities for blockchain.
Perhaps I need to explain blockchain briefly so that those that don't understand it can also understand the Telecom use cases for blockchain. Wikipedia defines it like this:
"A blockchain... is a distributed database that maintains a continuously growing list of records, called blocks, secured from tampering and revision. Each block contains a timestamp and a link to a previous block.By design, blockchains are inherently resistant to modification of the data — once recorded, the data in a block cannot be altered retroactively. Through the use of a peer-to-peer network and a distributed timestamping server, a blockchain database is managed autonomously. Blockchains are "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically."
So, it's an immutable record of changes to something. I was thinking about that yesterday and there were a number of use cases in Telecom that I could think of that could use blockchain. I'm not suggesting that they should use blockchain or that it's needed, just that they could. These are the Use cases I came up with:
Fraud prevention : being immutable makes it harder to 'slip one by' the normal accounting checks and balances that any large company has. I suppose the real question is 'exactly which records need to be stored in a blockchain to enable that fraud prevention?' The obvious one is the billing records.
Billing - maintaining state of post-paid billing accounts, who is making payments, billing amounts and other biulling events (such as rate changes, grace periods etc)
Tracking changes to the network. At the moment, many of the changes being made in a Telco's network may be made by staff, but increasingly, maintenance and management of the network is being outsourced to external companies and you want to keep en eye on them to ensure they're doing what they say they're doing. In the new world of Software Defined Networks (SDN) utilising Network Function Virtualisation (NFV) to build and change the network architecture at a rate that we've not seen before, it becomes important for a Telco to be able to track changes to the network to diagnose faults and customer complaints. Over a 24 hour period, a path on a network that supports enterprise customer X may change tens of times - much higher frequency than would be possible if the network elements were physical.
Tracking changes to accounts by customers and telco staff - I could imagine a situation where a customer claims that they didn't request a configuration change, but a blockchain based record of changes could be used to track beck through all the changes in a customer's account to determine what happened and when - potentially enabling a Telco to limit the liability to the customer... or vice versa...
Tracking purchases - A blockchain record of purchases would allow a CSP to rebuild a customer's liability from base information; provided there was an immutable record of the data records as well...
xDRs - any type of Data Record (CDRs, EDRs...) could be stored in a blockchain to facilittate rebuilding of a client's history and billing records from base data. The problem with using a blockchain to store xDRs is the size requirements. I know that large CSPs in India for example produce between five and ten BILLION records per day. It wouldn't take long for that to build up to a very large storage requirement - even if you store the mediated data records, it's going to be very large. I guess the question is : 'what is the return on investment?' - it is worth while doing. I can't think of a business case to justify such an investment, but there may be one out there.
Assurance events - Recording records associated with trouble tickets and problem resolution.
I don't for a second think that all of these can be justified in terms of cost/benefit analysis, but I could see blockchain being used in these scenarios.
Do you have any ideas? Please leave a comment below.
I realise I missed the usual business case that blockchain is used for - a financial ledger. Obviously storing a CSP's financial data in a blockchain would work (and make sense) as it would in ANY other enterprise. I really wanted to illustrate the CSP specific use cases for blockchain.
This post is an update to my earlier post which is now sadly mostly incorrect because IBM's web site has been completely restructured and none of the links I provided previously are valid any more.
I know this isn't strictly related to my normal Industries, but it is applicable for anyone who want's to chat with IBMers, so I thought it was valuable enough to share. For a number of years now, my email signature has included a link for non-IBMers to contact me via Sametime. If you're an IBMer reading this, you might consider linking to this post in your email signature yo allow your customers and partners to chat with you via Sametime.
Here is a step by step guide to setting it up so that you can chat with IBMers over Sametime/IBM Instant Messaging.
There are a few things you'll need for this to work:
An ibm.com id - these are free and available from Sign up for an IBMid if you don't already have one
A Sametime/IBM Instant Messaging compatible client installed on your computer/device. Previously a web client was available however that link is no longer working, so a 'fat client' install would seem to be the way to go. You can download the latest Sametime client from Lotus Greenhouse site which will also require a (free) ID to be created. This is a different ID to the IBMid mentioned above, but just as quick anbd easy to get. You can use other non-IBM clients such as Adium or Pidgin but those clients will require some 'hacking' to allow them to connect to the IBM Instant Messaging Gateway - if you're keen, please check out this Blog post from nomaen that details that configuration. Personally, the IBM client does the job really nicely and is available for Windows, Mac, and Linux (RPM and DEB) so' I'd just go that route.
Once you have your client installed, you'll want to set up a server community for the IBM IM Gateway. The details you need are:
Host Server : extst.ibm.com
Server Community Port : 80
Connection : Direct connection using HTTP protocol
See these screen dumps for reference...
Once you login with your IBMid, you'll be presented with the ST client and no one in your buddylist. Sending instant messages to yourself isn't very interesting and really what you want to do anyway is to chat with IBMers so lest add an IBMer to your buddylist so that you can chat with them...
You will need to know their Internet email address as you have to manually type it in. You will not be able to serach for them. Select the "Add external person by email address' radio button, then type in their email address and name, asign a group if you want to group your contacts.If you don't know they're email address, you can search here to find it.
Once you click on 'add' a popup will appear telling you that the IBMer will need to approve you to be able to see their status and chat with them through the IM Gateway.
NB. In the buddylist - the au1.ibm.com is my internal Sametime community id (which is the same as my email address) and the optusnet.com.au email address is my ibm.com id.
Once you've added your IBM contacts, you're up and running and the interface should look something like this (below):
A chat session between my two IDs (my IBMid and my internal id) looks like this in both the standalone client (used for my external IBMid and the embedded client in my IBM Notes client - on Linux)
and the internal view of the same conversation:
You might notice that all the rich text, file, image functions are greyed out - that's because they are not supported by the external IBM gateway so you'll be restricted to plain text in your chats...
This capability is not well known among IBMers, but I have spoken with a number of partners, exIBMers and my wife via this facility in the past.
Hopefully, this post will spread the word a bit more....
The TeleManagement Forum (TMF) have defined a set of four frameworks collectively known as Frameworx. The key frameworks that will deliver business value to the CSP are the Information Framework(SID) and the Process Framework (eTOM). Both of these can deliver increased business agility - which will reduce time to market and lower IT costs. In particular if a CSP is undertaking with the multiple major IT projects in the near term, TMF Frameworx alignment will ease the pain associated with those major projects.
Without a Services Oriented Architecture (SOA), such as many CSP's have currently, there is no common integration layer, no common way to perform format transformations with that multiple systems can communicate correctly. A typical illustration of this point to point integration might look like the Illustration to the right:
Each of the orange ovals represents a transformation of information so that the two systems can understand each other - each of which must be developed and maintained independently. These transformations will typically be built with a range of different technologies and method, thus increasing the IT costs of integrating, maintaining such transformations, not to mention maintaining competency within the IT organisation.
A basic SOA environment introduces the concept of an Enterprise Service Bus which provides a common way to integrate systems together and a common way of building transformation of information model used by multiple systems. The Illustration below shows this basic Services Oriented Architecture - note that we still have the same number of transformations to build and maintain, but now they can be built using a common method, tools and skills.
If we now introduce a standard information model such as the SID from the TeleManagement Forum, we can reduce the number of transformation that need to be built and maintained to one per system as shown in the Illustration below. Ensuring that all the traffic across the ESB is SID aligned means that as the CSP changes systems (such as CRM or Billing) the effort required to integrate the new system into the environment is dramatically reduced. That will enable the introduction of new systems faster than could otherwise been achieved. It will also reduce the ongoing IT maintenance costs.
As I'm sure you're aware, most end to end business processes need to orchestrate multiple systems. If we take the next step and insulate those end to end business processes from the functions that are specific to the various end point systems using a standard Process Framework such as eTOM, then business process can be independent of systems such as CRM, Billing, Provisioning etc. That means that if those systems change in the future (as many CSPs are looking to do) the end to end business processes will not need to change - in fact the process will not even be aware that the end system has changed.
When changing (say) the CRM system, you will need to remap the eTOM business services to the specific native services and rebuild a single integration and a single transformation to/from the standard data model (SID). This is a significant reduction in effort required to introduce new systems into the CSP's environment. Additionally, if the CSP decide to take a phased approach to the migration of the CRM systems (as opposed to a big bang) the eTOM aligned business processes can dynamically select which of the two CRM systems should be used for this particular process instance.
What that means for the CSP.
Putting in place a robust integration and process orchestration environment that is aligned to TMF Frameworx should be the CSP's first priority; this will not only allow the subsequent major projects integration and migration efforts to be minimised, it will also reduce the time to market for new processes and product that the CSP might offer into the market.
Telekom Slovenia is a perfect example of this. When the Slovenian government forced Mobitel (Slovenia) and Telekom Slovenia to merge, having the alignment with the SID and eTOM within Mobitel allowed the merged organisation to meet the governments deadlines for the specific target KPIs:
Be able to provide subscribers with a joint bill
Enable CSR from both organisations to sell/service products from both organisations
Offer a quad-play product that combined offerings from both Telekom Slovenia and Mobitel
All within six months.
When a CSP is undertaking multiple concurrent major IT replacement projects, there are a number of recommendations that IBM would make based on past observations with other CSPs that have also undertaken significant and multiple system replacement projects:
Use TMF Frameworx to minimise integration work (requires integration and process orchestration environment such as the ESB/SOA project is building) to be in place
Use TMF eTOM to build system independent business processes so that as those major systems change, end to end business processes do not need to change and can dynamically select the legacy or new system during the migration phases of the system replacement projects.
To achieve, 1 and 2, the CSP will need to have the SOA and BPM infrastructure that is capable of integration with ALL of the systems (not just limited to (say) CRM or ERP) within the CSP in place first
If you have the luxury of time, don't try to run the projects simultaneously, rather run them linearly. If this cannot be achieved due to business constraints, limit the concurrent projects to as few systems as possible, and preferably to systems that don't have a lot of interaction with each other.
Operators hoping to engage in widespread deployment of voice over LTE in order to gain spectral efficiencies in their network may face some unhappy customers because one vendor's recent tests showed that VoLTE calls can slash a device's talk-time battery life by half.
For years now, we've known that higher speed mobile networks would mean more power required in handsets to maintain the higher bandwidth connections. I recall it being raised as a concern when UMTS (3G) was being rolled out while GPRS or EDGE were the dominant technology in the mobile data networks. In fact, while I am travelling, I often switch off my 3G/3.5G network capability and trop back to GPRS and EDGE just to make my batter last through the day. It's interesting that it has been quantified like this.
When you think about it though, it makes sense. VoLTE (Voice over LTE) is not using a traditional GSM or CDMA circuit, rather it is using a packet data network to encapsulate the voice traffic - so it is voice over a data network. We've known for a long time that data traffic (particularly higher speed data traffic) uses a lot more power than voice traffic. More power equals less talk time from the same charge.
This study is a US based one, so it brings the luggage of CDMA rather than GSM like the rest of the world uses, but I think there are lessons here for the GSM carriers around the world too. CDMA battery life (from my experience) has been on a par with GSM battery life. I think it would be reasonable to equate the CDMA battery life in this study with GSM battery life.
I am seeing more and more countries around the world clawing back the 2G spectrum for use with Digital TV, LTE or other local requirements. At some point in the future (at least for some markets) the only Voice traffic will be using VoLTE and those subscribers will have severely reduced standby and talk time compared to mobile phones of a few years back. Will that lead to a backlash in the community? By that point it may be too late with the spectrum re-deployed for other uses. Will we end up with VoLTE being the only voice option in some countries and others still having CDMA or GSM voice networks - and will that complicate things for phone manufacturers? (remember the days of so called 'Global phones' that had to be made to cater to all the different spectrums used around the world - yes multi band phones became pervasive, but will so called Global Phones that retain backward compatibility with GSM networks be so popular when the primary channel for mobile phone distribution is still the telephone carriers themselves (and they have committed to VoLTE in their own country)?
Who knows. I do think that we'll end up with a big group of primarily voice subscribers who aren't going to be happy campers!