Highlight on telecommunication standards

Broadband and ICT Development for Improved Communication in Central Asia, Tashkent, 21-22 June 2007 1

Highlight on telecommunication standards(focus on ITU-T)

Georges SebekInternational Telecommunication Union (ITU)


2 NGN

4 IPTV

1 Standards

5 Security

3 Broadband

6 What next?


facilitate planning, system deployment and service offering, testingguarantee interoperabilityprovide confidence to the users in adopting a technology result in cost effective productsare vendor independent

1 Standards

ITU, ISO, IEC,ARIB, ATIS, ATSC, CCSA, CEA, Ecma International, ETSI, IEEE, ISOC/IETF, JCTEA, NIST, SCTE, SMPTE, TIA,TTA, TTC,3G Association, ASN.1 Consortium, ATSC, AVS, CEPCA, DSL Forum, EPC Global, ETIS, GSM Association, Home Gateway Initiative, IMTC, IPDR Organization, IPsphere Forum, IPv6 Forum, Liberty Alliance, MAAWG, MEF, MMTA, MFA Forum, MSF, NRO, OASIS, OIF, OMA, OMG, SDL Forum Society, TM Forum, UNICODE Consortium, UPnP Forum, W3C, …


ITU-T: unique worldwide venue for industry and government to foster development and use of interoperable, non-discriminatory and demand-driven international standardsITU-R: use of radio frequency spectrum, develop Recommendations on radiocommunication mattersITU-D: promoter and catalyst for telecommunication / ICT development and the bridge between relevant partners, especially in developing and least developed countriesGeneral Secretariat: provides services to the membership, coordinates and support the activities of the Sectors

Plenipotentiary Conference

ITU Council

ITU-RWorld Radiocommunication

ConferenceRadiocommunication

Assembly

ITU-DWorld

Telecommunication DevelopmentConference

GeneralSecretariat

ITU-TWorld

Telecommunication Standardization

Assembly

1.1 ITU structure


WORLD TELECOMMUNICATIONSTANDARDIZATION ASSEMBLY

TELECOMMUNICATIONSTANDARDIZATIONADVISORY GROUP

STUDY GROUP

WORKINGPARTY

Q

STUDY GROUP STUDY GROUP

WORKINGPARTY

WORKINGPARTY

Q Q Q

Q = Question

WTSA

TSAG

SG

WPFocus Groups

NGN-GSI

JCAs (NGN, N-ID…)

1.2 ITU-T structure


SG 2 Operational aspects of service provision, networks and performanceSG 3 Tariff and accounting principles including related telecommunications economic and policy issues SG 4 Telecommunication managementSG 5 Protection against electromagnetic environment effects SG 6 Outside plant and related indoor installationsSG 9 Integrated broadband cable networks and television and sound transmissionSG 11 Signalling requirements and protocols SG 12 Performance and quality of serviceSG 13 Next generation networks SG 15 Optical and other transport network infrastructures SG 16 Multimedia terminals, systems and applications SG 17 Security, languages and telecommunication softwareSG 19 Mobile telecommunication networks

1.3 ITU-T study groups


ITU-T

Rec.

Y.2001

NGN: a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-relatedfunctions are independent from underlyingtransport-related technologies.

It enables unfettered access for users to networks and to competing service providers and/or services of their choice. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.

2.1 Next Generation Networks


Pre-NGN:Verticallyintegratednetworks

Telephonyservices

Dataservices (WWW, e-mail,

etc)

Video services

(TV, movie,

etc)

PSTNData

servicesnetwork

Videoservicesnetwork

NGN transportstratum

NGN servicesstratum

NGN:Horizontallyintegratednetworks

NGN-GSI

Next Generation Networks – Global Standards Initiative

http://www.itu.int/ITU-T/ngn

2.2 NGN basic concept



Unifying IP convergence layer

Internet Protocol(IP)

Any service&

Every service

Any transport&

Every transport technology

Scopeof

NGN

Services stratum

Transport stratum

2.3 NGN basic concept


Transport stratum

Service stratum

ControlMedia

Man

agem

ent

Func

tions

Management

ANI

Transport Control Functions

Resource and Admission

Control Functions

Network AttachmentControl Functions

Network AttachmentControl Functions

NNIUNI

Application Support Functions & Service Support Functions

Applications

Transport Functions

End-UserFunctions

OtherNetworks

Service ControlFunctions

Service UserProfiles

Service UserProfiles

Transport User Profiles

Transport User Profiles

NGN= Service Stratum + Transport Stratum - Basic Functions = User + Control + Management

2.4 NGN overall architecture


LegacyTerminals

LegacyTerminals

Transport Stratum

Service Stratum

End-UserFunctions

Application Functions

Core transport Functions

NGNTerminals

CustomerNetworks

Other N

etworks

Application Support Functions and Service Support Functions

Core TransportFunctions

Other N

etworks

EdgeFunctions

Access Transport Functions

Access Transport Functions

ServiceControl

Functions

Network Access

Attachment Functions

Network Attachment Control Functions

(NACF)

Access NetworkFunctions

Resource and AdmissionControl Functions

(RACF)

UserProfile

Functions

T. UserProfileFunctions

UserProfile

Functions

T. UserProfileFunctions

GWGWGWGW

Other NGNService Components

IPTV Service Component

PSTN / ISDN EmulationService ComponentIP Multimedia Component&PSTN/ISDN Simulation

IP MultimediaService Component

S. UserProfile

Functions

GWGWGWGW

Applications

Figure 1.Future revision of Figure 8/Y.2012: NGN components including IPTV service component

2.5 Addition of service components


Limited BB

BE IP

Limited services

NGN

Converged Broadband

Managed IP

FMC RFID IPTV Others

Business/Application oriented projects

•Simple linkage between layers•Simple business relationships•Simple players

•Simple linkage between layers with dynamics•Diverse and flexible business relationships•Diverse business models and players

2.6 Enabling for convergence


R1 Services

R1 Capabilities

FRA/IMS

MOB

CSF

QoS

Performance

Security

Migration FRW

Migration SCR

FPBN REQ

Candidate Tec

IP QoS Sig.

RACF

WG 1

WG 2

WG3&4

WG 5

WG 6

WG 7

2006 2007

Release 2 Services/Capabilities

Convergence Services/Capabilities (MM Type)

Networked ID services/Capability

Mobility and FMC Functional Architecture & Requirements

Networked ID Functional Architecture & Req.

Functional Requirements to support Public Services

Release 2 Functional Architecture Model and Requirements

Home Network Functional Architecture in NGN Environment

Home Network Signaling REQ

Performance under Non-Heterogeneous Network Environment

Continuation of End-End QoS aspects over different access network

Home Network Signaling REQ

IP QoS Signaling Protocol

NGN Signaling requirements NGN Signaling Protocol

RACF relevant protocols

PSTN/ISDN Emulation Architecture PSTN/ISDN Emulation Protocols

NGN Interworking Requirements NGN Interworking Functions

Home Gateway Functions to connect NGN

Gateway Functions for Networked ID services (RF Parts)

Authentication requirements of Networked ID services (overall) Security/Authentication of RFIDs

Convergence Services/Capabilities (Broadcasting Type)

Architecture to support fixed Broadcasting

Candidate Technology for future packet based networks FPBN Architecture

Scenarios migrate to NGN

Security on Single Sign-On

FG-NGN NGN-GSI2.7 Status of studies


3.1 Broadband statistics3.1 Broadband statistics


Study group 15 is focal point in ITU-T for optical and other transport network infrastructures, systems, equipment, optical fibers, and the corresponding control plane technologies to enable the evolution toward intelligent transport networks. Development of related standards for the customer premises, access, metropolitan and long haul sections.

Lead SG for: Access network transport (ANT)Optical technologies

3.2 Optical/transport work in ITU-T


Broadband passive optical network (BPON) access operating at 155M/622Mbit/s with interoperabilityGigabit capable passive optical network (GPON) operating up to 2.5 Gbit/sEnhanced DSL multi-Mbit/s network access over ordinary telephone subscriber lines;

ADSL1, ADSL2, ADSL2plusSHDSLVDSL1, VDSL2 (G.993.2)BondingPhoneline networking (HomePNA)

3.3 Access network


FTTB

FTTN

FTTC

PON

ADSL2+ / LR-VDSL/2

VDSL2

ADSL/2+

VD

SL/

2

Residential

Residential

Residential

MxU / Residential

ITU consent reached in Geneva May 2005Multiple Profiles defined to address regional and application specific bandwidth requirements

- Up to 30 MHz bandwidth- Up to 100/100 Mbps- Facilitate multimode devices (e.g. ADSL/2+ with 20.5 dBm)

ITU consent reached in Geneva May 2005Multiple Profiles defined to address regional and application specific bandwidth requirements

- Up to 30 MHz bandwidth- Up to 100/100 Mbps- Facilitate multimode devices (e.g. ADSL/2+ with 20.5 dBm)

About VDSL2 - ITU G.993.2About VDSL2 - ITU G.993.2

3.4 VDSL2 (ITU-T G.993.2) – An overview


Subscribers

Million Subscribers

Source: Del’Oro, Jan., 2006

Downstream (Mbps)

Performance

Upstream (Mbps)

100M

56k128k

1M2M

12M

24M

6M

50M

100M56k128k

1M2M

12M 24M6M 50M

Dial-upISDN

SHDSLADSL

ADSL2+

Cable*

VDSL

Services

BroadbandAccess

Services

82.3%

17.7%

Source: Point Topic, 2005

Home Networking

20%

Music Downloads

6%

VoIP20%

Gaming12%

Security 38%

Video over Broadband

4%

0

50

100

150

200

250

1999 2000 2001 2002 2003 2004 2005

Cable Modem

ADSL-G.SHDSL

VDSL

PON

Other

* Shared among 10 users

BVAS(Broadband Value-Added Services)

3.5 Performance, services, deployment


1988: ISDN

1 10 10 000 100 000

Computational Complexity[Bandwidth*Mbps]

Broadband Performance[Mbps*km]

60 25 10 1

2005: VDSL2 (G.993.2)

2000: VDSL1 (G.993.1)

1998: ADSL (G.992.1)

3.6 Broadband access performance


BroadbandServices

Broadband EntertainmentTelecom

Polymer Optical FiberVDSL2

POF Solution for Video Home NetworkingPOF Solution for Video Home NetworkingVery thin fiber for simple and invisible installationHigh reliability and speed of 100Mbps and moreNo electromagnetic interference

Very thin fiber for simple and invisible installationHigh reliability and speed of 100Mbps and moreNo electromagnetic interference

3.7 Home networking, the last meters


New fibre specification widens operating wavelength band to 1470-1625 nmNew interface specification quadruples capacity to 40 Gbit/sCoarse and dense wavelengh division multiplexing (C/DWDM) allows carriers to cost-optimise use of fiber optics in metropolitan and long haul applicationsForward error correction (FEC), high bit rate DWDM submarine systemsFree space optical (FSO) transmission systems

3.8 OTN technologies


CO

ONU

CoreNetwork

1310nm

1490nm

Optical splitter (passive)

Bi-directional transmissionover one fiber using WDM

OLTONU

ONU

Upstream packet multiplexing on fiber without collision

3.9 PON technologies


Very high speed data up to 1 Gbit/s to home and businesses

Maintenance cost reduction due to no electronics between CO and customers

Low cost due to fiber and CO interface shared by several customers

Constant data rate regardless of reach

Multiple applications including data (IP), video and voice (triple play)

3.10 PON advantages


B-PON GE-PON G-PON

Standard ITU-T G.983 IEEE 802.3ah ITU-T G.984

Downstreamdata rate 600 Mbit/s 1 Gbit/s 2.4 Gbit/s

Upstreamdata rate 150 Mbit/s 1 Gbit/s 1.2 Gbit/s

TransmissionFormat ATM Ethernet Ethernet + TDM

+ATM

(Note) Rates of common practice

3.11 PON comparison


InternetInternetInternet

ONU (Single Family Unit)

OLT

ONU (Multi Dwelling/Tenant Unit)

2.4 G

1.2 G

20 km

10G/1G

1G

100M

100M

IPTV systems

IPTV IPTV systemssystems

VoIP systems

VoIP VoIP systemssystems

3.12 G-PON example


4.1 IPTV

What is IPTV?

IPTV is defined as multimedia services such as television/ video/ audio/ text/ graphics/ data delivered over IP based networks managed to provide the required level of QoS/QoE, security, interactivity and reliability.

IPTV is NOT television over IPIt is much more


4.2 IPTV domains

Content provider

Service providerEnd-user Network provider

Encoders

Management

VOD /Middleware

OfficeComputerOffice

Phone

Home OfficePhone

HomeComputer

TV

PDA

GamingConsole

EASConditional access


4.3 IPTV functional architecture


4.4 IPTV work areas

Architecture and requirementsQoS and performanceService security and content protectionNetwork and controlEnd systems and interoperabilityMiddleware and application platforms


4.5 IPTV is an integral part of NGN


ITU-T Security building blocks

5.1 Telecommunication security


SG 17 is the lead study group on telecommunication security - It is responsible for coordination of security across all study groups.

Subdivided into three Working Parties (WPs)

WP1 - Open systems technologies;

WP2 - Telecommunications security; and

WP3 - Languages and telecommunications software

Most (but not all) security Questions are in WP2 of SG 17

SG 13 (NGN) also has a Question on NGN security

Other study groups deal with application-related security

Summaries of all draft Recommendations under development in SG 17 are available on the SG 17 web page at http://www.itu.int/itu-t/studygroups/com17

5.2 Security work in ITU-T

http://www.itu.int/itu-t/studygroups/com17


Cyber Security* Vulnerability Information Sharing…* Incident Handling Operations

Secure Communication Services* Secure Mobile Communications* Home Network Security* Web Services Security

Q.6/17

Q.9/17

Q.7/17 Q.5/17

Communications System Security Project *Vision, Project Roadmap, …

Q.4/17

Telebiometrics*Multimodal Model Framework*System Mechanism*Protection Procedure

Q.8/17

SecurityArchitectureand Framework*Architecture,Model,Concepts, Frameworks

SecurityManagement* ISMS-T* Incident

Management* Risk

AssessmentMethodology

TelecomSystems

Telecom Systems Users

Countering spam by TechnicalMeans* Technical anti-spam measures Q.17/17

5.3 Security areas


Examples of recently approved security Recommendations (revision to well established standards, frameworks, technology or applications-related,…)

M.3016.0, 1, 2, 3, 4

Security for the management plane: Overview, Security requirements, Security services, Security mechanism, Profile proforma

X.509 Information technology – Open Systems Interconnection – The Directory: Public-key and attribute certificate frameworks

X.805 Security Architecture for Systems Providing End-to-End Communications

X.893 Information technology – Generic applications of ASN.1: Fast infoset security

X.1035 Password-authenticated key exchange (PAK) protocol

X.1051 Information security management system - Requirements for telecommunications (ISMS-T)

X.1081 The telebiometric multimodal model - A framework for the specification of security and safety aspects of telebiometrics

X.1111 Framework for security technologies for home network

X.1121 Framework of security technologies for mobile end-to-end communications

X.1122 Guideline for implementing secure mobile systems based on PKI

X.1141 Security Assertion Markup Language (SAML 2.0)

X.1142 eXtensible Access Control Markup Language (XACML 2.0)

Y.2701 Security requirements for NGN release 1

5.4 Recent security Recommendations


Extract from the current SG 17 security workQ. Acronym Title or Subject

5 X.akm Framework for EAP-based authentication and key management

6 X.1205 Overview of cybersecurity

6 X.idmf Identity management framework

6 X.gopw Guideline on preventing worm spreading in a data communication network

7 X.1051 (Revised) Information security management guidelines for telecommunications based on ISO/IEC 27002

7 X.rmg Risk management guidelines for telecommunications

8 X.bip BioAPI interworking protocol

8 X.tai Telebiometrics authentication infrastructure

9 X.homesec-2, 3, 4 Certificate profile for the device in the home network, User authentication mechanisms for home network service, Authorization framework for home network

9 X.msec-3 General security value added service (policy) for mobile data communication

9 X.p2p-1 Requirements of security for peer-to-peer and peer-to-multi peer communications

9 X.websec-3 Security architecture for message security in mobile web services

17 X.csreq Requirement on countering spam

17 X.fcsip Framework of countering IP multimedia spam

Many more in SG 17 work plan … 49 x items

5.5 Security work in progress


Question 15/13, NGN Security: work in progress

Y.IdMsec NGN identity management security

Y.NGN AAA AAA application for implementation of network and service security requirements over NGN

Y.NGN Authentication NGN Authentication

Y.NGN Certificate Management

NGN certificate management

Y.SecMechanisms NGN Security mechanisms and procedures

Y.SecReqR2 Security requirements for NGN release 2

5.6 NGN security


Specific Systems, Services, ApplicationsSecurity in ITU-T are developed bySG 2, 3, 4, 5, 6, 9, 11, 13, 15, 16, 19

Core Technology and Common SecurityTechniques in ITU-T are developedby SG 17

Security standardization Collaboration is key factor

ISO/IEC SC 27, 37 IETF ANSI, ETSI, OASIS, etc.

5.7.1 Collaborative security work


World Standards Cooperation (WSC) ISO, IEC, ITU

Global Standards Collaboration (GSC) Regional, National SDOs and ITU-T, ITU-R

exchange information between participating standards organizations to facilitate collaboration and to support the ITU as the preeminent global telecommunication and radiocommunication standards developmentorganization

ISO IEC ITU-T Strategic Advisory Group on Security (SAG-S)

To oversee standardization activities in ISO, IEC and ITU-T relevant to the field of securityTo provide advice and guidance to the ISO Technical Management Board, the IEC Standardization Management Board and the ITU-T Telecommunication Standardization Advisory Group (TSAG) relative to the coordination of work relevant to security, and in particular to identify areas where new standardization initiatives may be warrantedTo monitor implementation of the SAG-S Recommendations




Security Standardization Exchange Network (SSEN)an informal association of individual security practitioners with direct experience of, or strong interest in, security standardizationfacilitate the informal exchange of information on security-standards-related matters to increase overall awareness of issues of common interest with the intention of helping to advance the development of needed standards and minimizing overlap and duplication of effort in security standards development

SG 17 Security Standardization, Implementation and Evaluation Strategy Initiative

Why, What, How … to provide a security infrastructureStrategy includes necessary collaboration within SG 17, ITU-T SGs, ITU, the telecom industry and SDOs.




Focus Group Security baseline for network operators (FG SBNO)

Established October 2005 by SG 17 Objectives:

Define a security baseline against which network operators can assess their network and information security posture in terms of what security standards are available, which of these standards should be used to meet particular requirements, when they should be used, and how they should be appliedDescribe a network operator’s readiness and ability to collaborate with other entities (operators, users and law enforcement authorities) to counteract information security threatsProvide meaningful criteria that can be used by network operators against which other network operators can be assessed, if required.

AchievedSurvey network operators by means of a questionnaire

Next step:Develop text to be proposed to SG 17 for progressing as an ITU-T publication

5.8 Focus Group SBNO


Established December 2006 by SG 17The objectives of the FG IdM are • 1) to perform requirements analysis based on uses case scenarios, in

order• 2) to identify generic IdM framework components, so that• 3) a standards gap analysis can be completed, in order• 4) to identify new standards work and the ITU and other SDOs that should

perform the workThe first three meetings of the FG IdM took place in February, April and May 2007Focus Group structure• Ecosystem and Lexicon Working Group• Use Cases Working Group• Requirements Working Group• Framework Working Group

5.9.1 Focus Group IdM

Focus Group Identity Management (FG IdM)

http://www.itu.int/ITU-T/studygroups/com17/fgidm/index.html


2007 2008

ITU-T SG 13 Q.15 Rec. Y.IdMsec

ITU-T SG 17 Q.6 Rec. X.Idmf

ITU-T Focus GroupIdentity Management

Established Geneva13-16 Feb

Geneva23-25 Apr

Mountain View17-18 May

Tokyo18-20 Jul

GenevaSept

ISO/IEC JTC 1/SC27

5.9.2 Focus Group IdM

Focus Group Identity Management (FG IdM) - Timing


ICT security standards roadmap

Part 1 contains information about organizations working on ICT security standardsPart 2 is database of existing security standardsPart 3 will be a list of standards in developmentPart 4 will identify future needs and proposed new standardsPart 5 is now being built and includes Security Best Practices

5.10.1 Security awareness


Part 2 currently includes ITU-T, ISO/IEC JTC 1, IETF, IEEE, ATIS, ETSI and OASIS security standards

Since end of May 2007, the roadmap is available in a database format to allow searching by organization and topic and to allow organizations to manage their own data

Publicly available under Special Projects and Issues at: http://www.itu.int/ITU-T/studygroups/com17/index.asp

We invite you to use the Roadmap, provide feedback and help us develop it to meet your needs


ICT security standards roadmap

http://www.itu.int/ITU-T/studygroups/com17/index.asp


Other projects

Security manual: Security in Telecommunications and Information Technology – An overview of existing ITU-T Recommendations for secure telecommunications.

Version 3 available (being translated in Arabic, Chinese, French, Russian and Spanish)

http://www.itu.int/ITU-T/publications/index.html

Security compendium:catalogue of approved ITU-T Recommendations related to telecommunication securityextract of ITU-T approved security definitionslisting of ITU-T security related Questions

http://www.itu.int/ITU-T/studygroups/com17/tel-security.html


http://www.itu.int/ITU-T/publications/index.html

http://www.itu.int/ITU-T/studygroups/com17/tel-security.html


Security is everybody's business

Collaboration with other SDOs is necessary

Security needs to be designed in upfront

Security must be an ongoing effort

Systematically addressing vulnerabilities (intrinsic properties of networks/systems) is key so that protection can be provided independent of what thethreats (which are constantly changing and may be unknown) may be

5.11 Security observations


6.1 What next?

TelephoneServices

DataServices (WWW,

e-mail, etc)

Video Services

(TV, movie, etc)

TelephoneServicesNetwork

DataServicesNetwork

VideoServicesNetwork

Pre-NGN

Resource-based Pol./Reg.

Voice Internet

IP (Future Packet ?) Platform

xDSL/Optic based Fixed-Mobile

Pol.Reg.

Pol. XReg. x

Video MM

Service-based Pol./Reg.

Transport Agnostic

SPmSP3SP2

ANP 2 (DSL)

Access Agnostic

ANP 1 (DSL)

ANP 3 (Opt)

ANP N (Cable)

SP1

CNP 1 CNP

2

CNP 3

Access Network Provider Domain

Service/Application Provider Domain

Core Network Provider Domain

User

Towards agnostic


6.2 What next?NGN architecture enabling RFIDs/USN


6.3 What next?

• IP is a key for service offerings: Everything over IP over anything•Signaling among distributed network element, not end-to-end• Many different IDs for different services; E.164, names, IP Add etc.• User expectation changing; no interest for connection/operation,

but for services and businesses

New Paradigm: New model of User/Control/Management

• Vision: Any time, Anywhere, Any service and Any devices• Fixed mobile convergence should be the first instantiation• Any information/service over any transport infrastructure: VoDSL, TVoMobile, etc. (transport agnostic)

Convergence should be a critical framework

Changing role of current network model; U-/C-/M-


6.4 What next?

Fixed TV(Analog)

Fixed TV(Digital)

Mobile TV(DMB/DVB)

Fixed IPTV Mobile IPTV

Resolution Convenience

Contents

More ?

NGN ArchitectureNGN Architecture

Mobile IPTV


6.5 What next?

Mobile IPTV - Challenges

Reduced capability devicesA/V decoders, interactive middleware

AdaptabilityVarious types of access networks, form factors, levels of processing power

MobilityMobile terminals are moving so the environment changes dynamically

Protocols and algorithmsDealing with network congestionDealing with packet loss due to wireless interference

…


6.6 What next?

All ITU-T study groups are reconsidering their objectivesProposal for study in the 2009-2012 period to be discussed by WTSA-08

Proposals are welcome


Some useful web resources

ITU-T Home page www.itu.int/ITU-T

Study Group 13 www.itu.int/ITU-T/studygroups/com13



Recommendations www.itu.int/ITU-T/publications/recs.html

ITU-T Lighthouse www.itu.int/ITU-T/lighthouse

ITU-T Workshops www.itu.int/ITU-T/worksem

ICT Security Roadmap www.itu.int/ITU-T/studygroups/com17/ict/

NGN-GSI www.itu.int/ITU-T/ngn

As a conclusion

Thank you foryour attention !!!

http://www.itu.int/ITU-T

http://www.itu.int/ITU-T/studygroups/com13

http://www.itu.int/ITU-T/studygroups/com15

http://www.itu.int/ITU-T/studygroups/com17/index.asp

http://www.itu.int/ITU-T/publications/recs.html

http://www.itu.int/ITU-T/lighthouse

http://www.itu.int/ITU-T/worksem

http://www.itu.int/ITU-T/studygroups/com17/ict/index.html


Highlight on telecommunication standards

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