Virtually every major telecom industry player must now be dealing with IMS. News of planned IMS-compatible products and services are arriving with regularity. Are you one of those players? If you are testing IMS, then you must understand what strategies to adopt to implement and profit from this technology now to safeguard medium to long term growth in subscribers and usage.

Despite investment constraints forced upon them by the 2008-2009 global economic slowdown, operators are still looking beyond 3G in the quest to sustain their growth in the medium to long term and reduce competitive threats. Although some projects have been postponed due to the adverse financial climate, a great number of planned deployments are still being pursued by operators, as IMS represents a key platform for future service provisioning and a long term investment beyond 2012, future-proofing operators from risk in increased service sophistication and capacity requirements.

With companies such as Nokia Siemens Networks (NSN) going straight to enterprises and offering managed IMS based systems away from the carrier, the importance and influence of IMS is critical to all concerned in the value chain. Are you fully prepared for how it will impact on you?
IP Multimedia Subsystem (IMS) is an open and standardised architecture for mobile and fixed services. But is this really true - is the standard truly open to all? It is used by operators to offer network-controlled multimedia services by combining voice and data in a single packet switched network. Visiongain believes that IMS is one of the key drivers of convergence, but with network-client framework suppliers not reaching agreement then issues will still linger. IMS is gaining increased momentum and will have a fundamental impact on your operation. Virtually all major vendors have IMS strategies in place - competition in this area is ever strengthening. Ensure you are successful tomorrow by ordering visiongain's latest report, The IMS Report Market Forecast 2009-2014, today.

This updated version of the IMS 2009 report provides a critical insight into the different aspects of IMS strategy adopted by various operators across the globe. The report also seeks to dispel the hype and confusion surrounding IMS. We aim to describe the technology itself, its readiness for deployment and its compatibility with existing infrastructure.

Operators in Western Europe are embracing IMS, despite ongoing economic pressures in the global market, due to the considerable measure of cost and revenue leakage control enabled by such platforms. The technology also holds huge potential to increase operator ARPU and reduce churn - will you and your organisation be successful proponents of IMS - order and read visiongain's unique insight into market developments, as well as the future technology roadmap of LTE and 4G.

The brand new report answers key questions, such as:

• Where do the greatest opportunities lie for operators and vendors?
• How can both fixed and mobile operators benefit and profit from IMS?
• What new types of services and applications will IMS enable?
• How will demand for IMS equipment vary by region?

By reading this report you will get a detailed perspective on IMS: the technology itself, key players, issues, forecasts and critical success factors that will make IMS a reality.
This report will tell you:

• When fully-fledged IMS handsets will be available? - lack of IMS-capable handsets still an massive concern.
• What the total revenue potential from 3G and HSPA is with IMS? - Standards must be set on how to integrate IMS and non-IMS handsets
• How would the above questions apply when LTE, WiMax and UMB are added to the equation?
• What issues your company will need to start looking at in the short-term future?
• How using this technology can increase revenues and reduce customer churn? - an agreed standard must be developed to allow manufacture.
Key concerns such as these still exist. If IMS is to offer unique benefits then questions must be answered today.
The report aims to provide:
• An IMS framework for operators that will aid them in formulating IMS strategies, this framework will also allow operators to take an holistic view across their value chain, across departments and units service delivery and infrastructure plan to reduce long-term unit cost;
• Vendors in the IMS arena;
• Cost-benefit analysis for IMS;
• Forecasts covering how and when fixed and mobile operators will begin rolling out IMS-standard services that will generate revenue while making use of existing investments;
• Impact of IMS on the telecoms landscape;
• Key benefits of IMS to both operators and end-users; and
• Challenges and obstacles in implementing IMS.

IMS truly merges the internet with the cellular world to provide ubiquitous access to internet technologies and to provide consumers with appealing services. However if IMS features on your future technology plans, you need to get a handle on this subject now.

The report provides forecasts for revenue generation from these services and describes the key drivers to successful future of IMS services, applications and handsets. By buying this report, you will be ideally placed to profit from IMS development.

Executive Summary
E1 Steadily IMS is gaining ground
E2 IMS is offering a variety of benefits and opportunities for early adopters
E3 Challenges and Issues with IMS
E4 Development of IMS Handsets
E5 IMS Business Model
E6 IMS' Impact on the Telecom Value Chain
E7 Conclusions and Key Findings
Introduction
1.1 IMS Defined
Figure 1: IMS a Layered Architecture
1.1.1 IMS: Envisaged by 3GPP
1.1.2 IMS is Access Agnostic
1.2 Business Case for IMS
1.2.1 Short and Long Term Business Objectives
1.2.1.1 Convergence
1.2.1.2 Need for Differentiation
1.2.1.3 Success of the Internet
1.2.1.4 IP Telephony
1.2.1.5 Telecom Market evolution
Figure 2: Telecom Market Evolution
1.2.1.6 Why IMS is Critical for the Operators' Growth Strategy?
Figure 3: IMS Business Case
1.3 Aim of the Report
1.3.1 Holistic Framework for formulating IMS strategies
Figure 4: IMS Framework
1.4 Report Structure
1.5 Report Scope
1.6 Methodology
Understanding IMS
2.1 Next Generation Networks (NGN)
2.2 Mobile IP
2.2.1 All IP Networks
2.2.2 Transition from Circuit to Packet Switched Networks
Figure 5: Transition from Circuit to Packet Data
2.2.2.1 Stage One: 2G (Circuit based)
2.2.2.2 Stage Two: 2.5G (CS augmented with PS enablers)
2.2.2.3 Stage three: 3G and beyond (mostly PS-based networks, some CS)
Figure 6: Stages in Transition from Circuit Switched to Packet Switched Networks (2009)
Figure 7: Present and Future Networks
2.2.2.4 IMS: An All IP Networks/Next Generation Network
Figure 8: Traditional GSM Networks (Stovepipe Approach)
Figure 9: Horizontal Layered Architecture in IMS
2.3 IMS Architecture
2.3.1 Core Elements of IMS network
Figure 10: IMS Architecture
2.3.2 Enhanced Service Delivery with IMS
2.3.3 Flexibility in IMS
2.3.3.1 Gateway or the Transport & Endpoint Layer
2.3.3.2 The Session Control Layer
2.3.3.3 The Application Server Layer
2.4 Media Gateways
2.4.1 Home Subscriber Services
2.4.2 Summary of IMS Network Architecture
Table 1: IMS Complete Service Delivery Proposition
2.5 IMS Handset Architecture
Figure 11: High Level IMS Client Architecture
2.6 Key Features of IMS Technology
Table 2: Features Offered by IMS (R5)
2.7 Protocols Used in IMS
2.7.1 Session Initiated Protocol (SIP)
Figure 12: SIP Components
2.7.1.1 SIP's Routing Decisions
2.7.1.2 Problems posed by SIP
2.7.1.2.1 QoS
2.7.1.2.2 Fraud/Privacy
2.7.2 Session Description Protocol
2.7.3 RTP (Real Time Protocol)
2.7.4 Diameter
2.7.5 H.248 Megaco
2.8 Fixed to Mobile Convergence (FMC)
2.8.1 Convergence Trends in the Telecoms Market
Chart 1: Broadband Customer Growth (2009-2015)
2.8.1.1 Fixed Network Operators and their Interest in IMS
2.8.2 What is FMC?
2.8.2.1 What FMC will offer?
2.8.2.2 Market Demands for FMC
Table 3: Key FMC Deployments So Far (2009)
2.8.2.3 Fixed Line Operators Interested in Wireless Solutions
2.8.2.4 IMS and Fixed-Network VoIP Service Providers
2.8.2.5 IMS and Cable Service Providers
2.9 Making IMS Foolproof
2.9.1 Interoperability
2.9.2 Interoperability of SIP and SS7 Signalling
2.9.3 Compatibility
2.9.4 QoS Issues
2.9.5 Service Assurance and Risk Management
2.9.6 Security
2.9.7 IPv4 to IPv6 Conversion
2.10 Fundamental Technology Threats to IMS
2.10.1 Business Issues
2.10.2 Interoperability with Legacy Networks
2.10.3 IMS Client Issues
2.10.3.1 Are there any alternatives to IMS Handsets?
2.10.4 Web 2.0 and IMS
2.10.5 IMS and SDP
2.10.5.1 Interplay Between SDP, IMS and Web 2.0
2.10.6 IMS must support non-SIP Applications
2.11 Standards and Regulations
2.11.1 3GPP: Establishing IMS Requirements and Architecture
2.11.1.1 How 3GPP Works
2.11.1.2 Release 99
2.11.1.3 Release 4
2.11.2.3 Release 5
2.11.1.4 Release 6
2.11.1.5 Release 7
2.11.1.5 Release 8
2.11.1.6 Availability of IMS Equipment based on 3GPP Releases
2.11.2 3GPP2: Working Closely with 3GPP on IMS Architecture
2 11.2.1 Collaboration between 3GPP and 3GPP2
2.11.3 TISPAN
2 11.4 The Internet Engineering Task Force (IETF)
2 11.5 Consortia, Coalitions and Associations
2.11.5.1 SIP Forum
2.11.5.2 SIP Centre
2.11.5.3 Fixed-to-Mobile Convergence Alliance (FMCA)
2.11.5.4 NGN IMS Forum
2.11.5.5 OMA
2.11.5.6 GSMA's RCS Initiative
Table 4: RCS Members
2.11.6 Cable Labs
2.11.6.1 PacketCable 1.0 and 1.5
2.11.6.2 PacketCable 2.0
2.12 Regulatory Issues
2.12.1 Regulation and Interconnection of Data Networks
2.12.2 Other Regulatory Issues

3. Identifying the IMS strategy, Desired Outcomes, Benefits and Challenges
3.1 IMS Strategy
Figure 13: Operator Strategies to Deploy IMS
3.1.1 Deciding the Right Strategy
3.1.1.1 Network Infrastructure
3.1.1.1.1 Legacy Systems
3.1.1.1.2 2G Networks
Figure 14: Migration Options for Network Operators
3.1.1.1.3 Need for Training
3.1.1.1.4 Customer Care
3.1.1.1.5 Fixed Network Operators
3.1.1.1.6 Cable Operators
3.1.1.2 Standards based Approach
3.1.1.3 Growth
3.1.1.4 Differentiation
3.1.1.5 Customer Requirements
3.1.1.6 Time to Market
3.1.1.7 Other Questions
Table 5: Critical Questions that must be considered by Operators
3.1.2 Responding to Internal and External Environmental Pressures
Table 6: Benchmarking Guidelines for IMS Proposition
Table 7: Forming a IMS Strategy
3.2 Benefits of IMS
3.2.1 Capability to Launch New Services Faster
3.2.2 Range of Applications can be launched
3.2.3 Ability to Offer Converged Services to Customers
3.2.4 Powerful User Devices
3.2.5 Open Service Creation
3.2.6 Enhanced End User Proposition
3.2.6.1 Integrated Rich Media
3.2.6.2 Single Public Identity
3.2.6.3 Personalised Communications
3.2.6.4 Roaming
3.2.6.5 Cost Effective Solutions
3.2.6.6 Enhancement over Internet offering
3.2.7 Summary of Key Benefits
3.3 Desired Outcomes
3.3.1 Identify which Customer Segments to Target
3.3.1.2 How Operators can Target the Business Segment
3.3.1.3 Needs of Business Customers
3.3.1.4 ARPU Growth from Small and Medium Sized Companies
3.3.2 Mass Market for IMS
Table 8: Practical Benefits of IMS to Customers
3.4 Challenges Facing Mobile Operators
3.4.1 Evolving to an all IP Network
3.4.2 Finding the Right Business Model
3.4.3 Status of standards
3.4.4 Equipment availability
3.4.5 Service maturity
3.4.6 Increasing Operator Competition
3.4.7 Availability of Handsets
3.4.8 Intervening Networks
3.5 Challenges to Fixed Line Operators
3.6 How Vendors are selling IMS
3.7 Summary
4. Approach to IMS Deployment
4.1 End-to-end Deployment
4.2 Phased out Deployment
4.2.1 What Constitutes Part Deployments?
4.2.2 Deploying a part of IMS Solution
4.2.3 Problems with Part Deployment
4.3 Single Vendor Approach
4.4 Multiple Vendor Approach
4.5 Hosted IMS Solutions
4.5.1 Service Delivery Platform Approach
4.6 Deploying other Core Technology Components as a step towards IMS
4.6.1 IP-based Softswitch
4.6.1.1 Benefits of Softswitch Technology
4.6.2 Using GAN as a stepping stone to FMC
4.7 Steps to IMS Deployment
4.7.1 Migration Strategies
4.8 How to Approach Convergence in Networks
4.8.1 IMS with LTE
4.8.1.1 What is LTE?
4.8.2 Unlicensed Mobile Access (UMA) or Generic Access Networks (GAN)
4.8.3 Packet Core FMC Solution
4.9 The Right Choice

5. Players in the IMS Market
5.1 Industry Structure
Figure 15: IMS Value Chain
5.2 Infrastructure Vendors
Figure 16: Components in IMS Architecture
Table 9: List of Tier 1 IMS Equipment Vendors
5.2.1 Ericsson
5.2.1.1 Ericsson's IMS Studio
5.2.1.2 Ericsson's take on IMS Devices
5.2.1.3 Ericsson's Key Contracts
Table 10: Ericsson's Key IMS Contracts
5.2.1.4 Ericsson's Expert Centres
5.2.2 Nokia Siemens Networks (NSN)
5.2.2.1 NSN's IMS contracts
Table 11: NSN's Commercial Reference for IMS
5.2.3 Huawei
5.2.4 Alcatel Lucent
5.2.5.2 Alcatel Lucent's IMS Customers
Table 12: Alcatel Lucent's IMS Deployments So Far (2009)
Table 13: Alcatel Lucent's Key IMS Contracts
5.2.5.3 Key Partners of Alcatel Lucent in IMS
5.2.5 Motorola
5.2.6 Nortel
Table 14: Nortel's Commercial Reference for IMS
5.2.7 ZTE
5.2.8 Tekelec
5.2.9 Radisys Convedia
5.2.10 Oracle
5.2.11 Aricent
5.2.11.1 Aricent's Handset Client
5.2.12 Nable Communications
5.2.12.1 IMS Clients
5.2.13 Blue Slice Communications
5.2.14 Celtius
5.2.15 Tatara Systems
5.2.15.1 Ericsson and Tatara
5.2.16 Intel
5.2.17 HP and Tekelec
5.2.18 Cisco
Table 15 : Cisco's Key IMS Clients
5.2.19 BroadSoft
5.2.20 Acme Packet
5.2.21 Thomson
5.2.22 Audio Codes
5.2.23 Genband
Table 16: List of Gateway Vendors
5.2.25 NEC
5.2.26 Camient
5.2.27 Radvision
Table 17: Radvision's IMS Suite
5.2.27.1 Radvision's Client
5.2.28 Starent Networks
5.2.29 Newport Network
5.2.30 Iperia
5.2.31 RedKnee
Table 18: Application Server Vendors
5.2.32 BEA Systems
5.2.33 ECI Telecom
5.2.34 Juniper Networks
5.2.35 Radcom
5.2.36 Sonus Networks
5.2.37 Comverse
5.2.38 Vendor Ranking
Table 19: Vendor Ranking in IMS Equipment Deployments and Shipments
5.2.39 Strategies for Vendors in the IMS market
5.2.40 How Vendors are selling IMS
5.3 System Integrators
Table 20: List of System Integrators
5.3.1 IBM
5.4 IMS Handset Client Vendors
Table 21: List of IMS Handset Client Vendors
5.4.1 Comneon
5.4.1.1 Comneon's IMS Clients
5.4.1.2 Comneon's Key customers
5.4.2 NMS communications
5.4.3 Nokia
5.4.4 Motorola Mobile Devices
5.4.5 Samsung
5.4.6 Ecrio
5.4.7 Quanta Computer
5.4.8 Hello Soft
5.4.9 Handset Manufacturers
5.5 IMS Application Developers
5.6 IMS Gaming Vendors
5.6.1 Connect2Media (C2M)
5.6.2 Nexos
5.6.3 Exit Games
5.7 Other Applications Developers
5.8 Summary
Table 22: Vendors offering IMS service solution

6. IMS Applications, Deployments and Development
6.1 Applications offered by IMS
Table 23: Applications Enabled by IMS
6.1.1 Push to Talk over Cellular (PoC)/(PTT)
Table 24: List of Operators offering IMS ready PTT
Table 25: List of Vendors offering IMS Compliant PTT Solutions
6.1.1.1 Variants of PoC
6.1.1.2 PoC Will Drive IMS rollouts
Chart 2: PoC Subscriber Growth (2009-2015)
6.1.2 Video Telephony
Chart 3: Mobile Video Telephony Revenues (2009-2015)
6.1.3 Multimedia Streaming
6.1.4 Mobile Instant Messaging (MIM)
Chart 4: MIM Revenue Growth (2009-2015)
6.1.5 Presence
6.1.5.1 IMS Presence Services for Interactive Games
6.1.6 IPTV
6.1.6.1 Stand Alone Solution
6.1.6.2 Deploying IMS core and IPTV as a value added service on top
6.1.6.3 Developments in IPTV arena
6.1.6.4 Market for IPTV
Chart 5: IPTV Subscriber Growth (2009-2015)
Chart 6: IPTV Revenues Growth (2009-2015)
6.1.7 VoIP
6.1.7.1 VoIP Market
Table 26: Dual Mode SIP/Wifi/UMA handsets
Chart 7: Enterprise VOIP traffic, 2008
Chart 8: Enterprise VOIP traffic, 2012
Chart 9: VOIP Subscriber Growth (2009-2015)
Chart 10: VOIP Equipment Sale Revenues (2007-2015)
6.1.8 Gaming
6.2 Application Development
6.2.1 IMS Poses Challenges and Opportunities to Application Developers
6.3 Summary
6.4 IMS Deployments
Table 27: Live IMS Networks
6.4.1 IMS Deployments so far are Piecemeal Solutions
6.4.2 Mobile Network Operators
6.4.2.1 TeliaSonera
6.4.2.2 Chunghwa Telecom
6.4.2.3 BTC Group
6.4.2.4 MegaFon
6.4.2.5 Sprint Nextel
6.4.2.5.1 Sprint and Cisco
6.4.2.6 Mobilkom Austria
6.4.2.7 Brazil Telecom
6.4.2.8 AT&T
6.4.2.9 SK Telecom
6.5 NGN Implementations
6.5.1 BT
6.5.1.1 Key Milestones
6.5.2 KPN
6.5.3 Telecom Italia
6.5.4 Telefónica
6.5.6 Telefónica España
6.5.7 Swisscom
6.5.8 Verizon
6.5.8.1 AIMS
6.5.9 Softbank Mobile Corp
6.5.10 21st Century Technologies
6.5.11 France Telecom
6.5.12 Bell Canada
6.6 Cable Operators
6.6.1 Con Hem
6.7 Summary
Table 28: IMS Contracts and Deployments (2009)
7. Forecasts and IMS Profitability
7.1 Facts and Figures
7.1.1 Global Market Evolution to IMS
Chart 11: Share of Technologies Worldwide (2009)
7.1.1.1 3G Subscriber Growth
Chart 12: Global W-CDMA and GSM Subscriber Growth (2009-2014)
Chart 13: Global 3G Revenues (2009-2015)
Chart 14: Data revenues as a percentage of total revenues (2009-2015)
Table 29: HSDPA and WCDMA Statistics (2009)
7.1.1.2 From HSPA to HSPA+ and LTE
7.1.1.2.1 LTE Market and Opportunities
7.1.1.2.2 Why LTE?
Chart 15: LTE Subscriber Growth (2009-2015)
Chart 16: LTE Operator Revenues (2009-2015)
Chart 17: Revenues from Base Stations for LTE Networks (2009-2015)
7.1.1.2.3 LTE and IMS together in a Converged Network
7.2 IMS Deployment Time Frames
Chart 18: IMS Demand by Region (2009)
Chart 19: IMS Deployments
7.2.1 Developed Markets
7.2.1.1 US
7.2.1.2 Europe
7.2.2 Asia and other Emerging Markets
Chart 20: Softswitch Deployments in Asia
7.2.2.1 China
7.2.2.2 India
7.2.3 Deployments by Operator Type
Chart 21: IMS Deployments by Operator Types by (2015)
Chart 22: IMS Networks as a Percentage of Total Networks (2015)
7.3 Data ARPU from IMS
Chart 23: Percentage Data Revenues Generated by Different Data Applications (2015)
Chart 24: Global Data ARPU (2008-2015)
7.4 Impact on SMS Revenues via the Introduction of MIM using IMS Platforms
7.5 IMS Infrastructure Requirements
Table 30: IMS Equipments that must be deployed on incremental basis
Chart 25: IMS Control Layer Equipment Sales (2007-2014)
7.6 IMS Vendor Market share
Chart 26: Vendor Market Share (2009-2010)
Chart 27: Vendor Market Share (2015)
7.7 IMS Growth Prospects
Chart 28: IMS Revenues (2009-2015)
7.8 IMS Handsets
Table 31 : IMS Handset Enablers
Chart 29: 3G Growth Vs IMS Growth
7.8.1 SIP Enabled Handsets
Figure 17: Device Convergence
Chart 30: IMS Subscriber Growth (2007-2015)
Chart:31: IMS Handset Shipments (2008-2015)
Chart 32: SIP handset Shipments
7.9 Develop New Business Propositions
7.9.1 New Business Model
7.9.2 Long-term Benefits or Short-term Gains?
7.9.3 OpEx Savings
7.9.4 Cost of Deployment
7.10 IMS Applications
7.10.1 Time to Market with new Applications
7.11 Hosted IMS Solutions
7.12 Profitable Customer Segment
7.13 FMC Market
7.14 IMS ROI Scenarios
Figure 18: ROI from IMS Investments
Table 32: IMS SWOT Analysis
8. Recommendations and Conclusion
8.1 Threats to IMS
8.1.1 SDP
8.2 Recommendations
8.2.1 For Operators
8.2.1.1 Focus on High Revenue per Megabyte
8.2.1.2 Investment Strategies
8.2.1.3 Smooth Transition to IMS
8.2.2 For Vendors
8.2.3 For Device Manufacturers
8.2.3.1 Time to Market
8.2.3.2 Handset Development Strategy
8.2.4 Applications for the Future
8.2.5 IMS: Becoming a Reality
8.6 Conclusion

Companies Listed

3GPP2
3UK
Accenture
Acme Packet
Airvana
AIS(Thailand)
Alcatel Lucent
Apertio
Aricent
ArmenTel
AT&T
Audio Codes
BEA
Bejing Netcom
Belgacom
Bell Canada
Bell South
Blue Sclice
Bouygues Telecom
Brazil Telecom
Bridgeport Networks
Broadsoft
BT
Cable & Wireless
Camient
Celtius
China Telecom (China)
China Unicom
Chunghwa Telecom
Cisco
Clarent
CNC
Colibria
Com Hem Commander
Comneon
Connect2 Media
Convedia
crio
CYTA
Digital Nanning
ECI Telecom
Ecrio
Eircom
Elion
Elisa(Finland)
EMOBILE
Ericsson
ETSI
Exit games
FarEasTone
France Telecom
Fujian Telecoms
Fujitsu
Genband
Globe (Philippines)
Google
GSMA
Hello Soft
Hitachi
Hot Telecom
Hotsip
HP
Huawei
IBM
Intel
IP Unity Glenayre
Iperia
ITU
Jersey Telecom
jNetX
Juniper Networks
KDDI
Kineto Wireless
Korea Telecom
KPN
KT
KTF
LG
LG Electronics
Longboard
Lucent
Manx Telecom
Mavenir
MegaFon(Russia)
Metaswitch
Microsoft
Mitsubishi
Mobicom Austria
Motorola
Movial
MSF
MSV
NEC
NetCentrex
Neuf Telecom
Neustar
Nexos
NMS
Nokia
Nokia Siemens Networks
Nortel
NTl
NTT DoCoMo
NWT3GPP
O2
O2, Ireland
Oi
OMA
OpenCloud
Optimus
Oracle
Orange
Panasonic
PCCN
PCCW
Philips
Phone Systems and Networks
Qualphone
Quanta Computers
RadiSys
Radvision Convedia
Redknee
Samsung
Sanyo
Saunalahti
SBC
Seven
SFR
Sharp
Siemens
Singtel (Singapore)
SK Telecom
Softbank Mobile
Sonia Technologies
Sonus Networks
Sony-Ericsson
Spectel
Sprint Nextel
SPT
Starcom
Swisscom
Sylantro Systems
Symbian
T-2 (Slovenia)
Tatara Systems
TDC
Tekelec
Telcel
Telcordia
Tele Greenland
Telecom Italia
Telefonica
Telekomunikacja Polska
Telemar
Telenor
TeliaSonera (Sweden/Finland)
Telkom
Telkomsel(Indonesia)
Terraplay
TerreStar Networks
Thomson
Thou Telecom
Tilgin
TIM, Italy
Time Warner Cable
TISPAN
TMN (Portugal)
T-Mobile
Toshiba
Turkcell
Tusmobil (Slovenia)
Ubicode
Ubiquity Software
Ulticom
UT Starcom
Verisign
Verizon (USA)
Verizon Wireless
Virgin Media
Vivatel(Bulgaria)
Vivo
Vodafone Germany
Vodafone Ireland
Vodafone Portugal
Vonage
Wanadoo
Warid Telecoms
Wataniya(Kuwait)
Wateen Telecoms
Xten Networks
Zain(Saudi Arabia)
ZTE