1

IP telephony and NGN

February 22, 2005Naotaka MORITA

NTT Service Integration Laboratories

2

IP telephony Trends in Japan

(based on the latest research by Ministry of Internal Affairs and Communications)

3IP telephony scenarios in Japan

ISP #2

ClosedIP network

ISPaccessnetwork

Dedicated VoIP network

PSTN

RGW

RGW

ISP #1

MG

MG

MG

0AB-J

050

(1)(2)

(5)

(3)

(4)

In addition to the initial 050 type services, 0AB-J services are now being provided.

4Numbering plan for IP telephony in Japan

l In Japan, a specific numbering plan is applied for existing telephony, e.g., 0A0, 0AB0.

l For IP telephony, a new number allocation policy was introduced in Oct. 2002 based on performance and capabilities.

≦0.15

≦0.15

≦0.15

Call failure rate

0AB~JYes

0AB~JYes80–

050No~400 ms50–Class C

050Yes/no~150 ms

70–Class B

050No~100 ms80–Class A

Telephone numberEmergency callEnd-to-

end delayR-value

R-value and delay values are considered satisfactory when 95% of the samples are satisfied.R-value (general voice transmission quality rate) is the figure indicates the comprehensive transmission quality of VoIP (ITU-T G.107).

5Current IP telephony: number allocation

• 7.02 million IP phones are used in Japan. (total of “050” and “0AB-J”) – Since January 2004, it has increased by about 0.9 million

numbers quarterly.• Ratio of “050” numbers to “0AB-J” numbers is 99:1.

– 6.94 million users for “050” numbers and 0.08 million users for “0ABJ” numbers.

– Users increased by 1.71 million for “050” numbers and 0.04 million for “0ABJ” numbers in the 1st half of 2004 (April to September). The ratio is 98:2.

• In both retail and wholesale, the main carriers are NTT Communications, KDDI, and Softbank BB.– Ratio of retail to wholesale is 9:1.– Softbank BB only does direct marketing.

NTT Comm. and KDDI also do wholesale to other carriers.

6

Growth of IP phones

End of Dec. 2003 End of Mar. 2004 End of June 2004 End of Sep. 2004

(million)

0ABJ numbers

050 numbers

Approximately 40% of broadband service users have an IP phone.

• Total number of IP phone numbers in use (for both 050 and 0ABJ) is 7.02 million. Total for broadband service (FTTH, ADSL, and CATV Internet) users is 17.6 million

• Since the end of Dec. 2003, quarterly increases in IP phone users were: 0.95, 0.76, and 0.99 million.

1

2

3

4

5

6

7

8

0

4.315.24

6.94

4.33

0.02

0.04

5.28

6.04

7.02

0.08

0.95

0.76

0.99

7

Breakdown of IP phone numbers

End of Sep. 2004

7.00 million numbers

0ABJ

0.08 million numbers

Service provided by other carrier brand

(wholesale)

0.64 million numbers

Service provided by own carrier

brand

6.30 million numbers

050

6.94 million numbers

8IP phone numbers (050 and 0ABJ) granted to carriers

As of Jan. 20th 2005 As of end of Nov. 2004

NTT-ME

0.30 million

Plala

1.01 million

KDDI

2.52 million

NTT Communications

4.18 million

Softbank BB

8.13 million

Assigned 050 numbers

18.04 millionAssigned 0ABJ

numbers

252.33 million

NTT WEST

97.72 million

K-Opticom

1.19 million

NTT Communications

2.56 million

Yozan

3.60 million

Japan Telecom

0.35 million

Fusion Communications

0.65 million

Fusion Communications

5.53 million

Heisei Denden 6.18 million

KDDI 6.97 million

Japan Telecom

10.13 million

NTT DoCoMo Group

16.98 million

NTT EAST

94.28 million

Total number of 050 numbers granted to carriers is 18.04 million.

• Actually, 6.94 million 050 numbers are used (approx. 40%).

Assignment status of 050 numbers Assignment status of 0ABJ numbers

9

Breakdown by IP phone carrier

Softbank BB (BB Phone)

64.9%

NTT Communications (OCN .Phone)

8.3%

KDDI (KDDI-IP Phone)

5.6%

Plala Networks (Plala Phone)

3.3%

Nifty (@nifty phone)

3.1%

Japan Telecom (ODN IP Phone)

2.3%

CATV carriers

2.3%

Sony Communication Network (So-net

Phone)

1.8%

Others

7.0%Don’t know, no answer

1.6%

65% use Softbank BB. NTT Communications (8%) and KDDI (6%) follow.

10Access lines used by IP phone users

ADSL

88.7%

FTTH

6.9%

ADSL: Softbank BB (Yahoo! BB)

64.8%

ADSL: NTT EAST and WEST (FLET’s ADSL)

8.8%

ADSL: Acca Networks

6.8%

ADSL: eAccess

6.2%

ADSL: others

2.0%

FTTH: NTT EAST and WEST (B FLET’s)

3.7%

FTTH: others 1.0%

FTTH: Electric companies 1.8%

FTTH: usen0.4%

CATV 2.5% Others

1.9%

Approximately 90% use ADSL. FTTH (7%) and CATV (3%) follow.

11

n Scope: Interoperability specifications for IP telephony servicesn Documents and scheduleü TS-1002 SIP-ISUP interworking specification (reference point C)ü TS-1003 Framework of interoperability specifications between carriersü TS-1004 User ID interwork specificationü TS-1005 Guidelines for SIP-related technical specificationü TS-1006 UNI (reference point B) specificationü TS-1007 NNI (reference point A) specificationü All these documents will be standardized by the end of May 2005.n Policy for deciding specifications of interfaces: The basic concept is to achieve basic

interoperability of IP telephony by SIP, complying with RFC.

SIP network SIP network

PSTN

AdjacentSIP

node

SIPnodeAA

BBSIP terminalSIP terminal

Other protocol networks

XXOther protocol networks

XXCC CC

TTC SIP Activities

12

NGN in ITU-T

13Overview of NGN architecture in ITU-T

Transport layer

Service layer

Mediahandlingfunctions

Core transportfunctions

Core transportfunctions

Accesstransportfunctions

Accesstransportfunctions

Networkentry

functions

Othernetworks

Othernetworks

Customerfunctions

Customerdatabasefunctions Service and control

functions

Application functions

Gatewayfunctions

Transport adaptation functions

Control

Media

NNIUNI

Networkentry

functions

Note: Charging and billing functions and management functions are applied to both service and transport layers.

14TISPAN NGN architecture

Other multimediasubsystems …

Based on3GPP IMS R6

(RTSP-basedstreaming services)

(SIP-based-IP multimedia subsystem

(Core IMS)

IP connectivityaccess networkand related functionality

PS

TN

(SIP-basedPSTN/ISDN emulation

subsystem

Applications

IP

Resource and admission control

functionality

Core transport network

Access transportnetwork

GWGWGW

Network attachment functionality

GW

3GPP IP-CAN

153GPP IMS-related references

TS 23.228 Archi IP Multimedia Subsystem (IMS); Stage 2 S2TS 33.203 Security Access Security (& integrity protection) for IP-based Services”, Stage 2 S3TS 33.210 Security Netw. domain sec.; IP network layer security (sec of SIP signalling between network nodes) S3TS 23.218 Call Control IP Multimedia (IM) session handling; IM call model; Stage 2 N1TS 24.228 Call Control Signalling flows for the IMS Call Control based on SIP and SDP; Stage 3 N1TS 24.229 Call Control IP Multimedia Call Control Protocol based on SIP and SDP; Stage 3 N1TS 26.235 User plane Packet Switched Conversational Multimedia Applications; Default codecs S4TS 26.236 User plane Packet Switched Conversational Multimedia Applications; Transport protocols S4TS 29.162 Interworking Interworking between the IM CN subsystem and IP networks N3TS 29.163 Interworking Interworking between the IM CN subsystem and CS networks N3TS 23.278 Service Logic CAMEL - IP Multimedia System (IMS) interworking; Stage 2 N2TS 29.278 Service Logic CAMEL Application Part (CAP) specification for IP Multimedia Subsystems (IMS) N2TS 29.228 User data & interfaces IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling flows and message contents N4TS 29.229 User data & interfaces Cx and Dx interfaces (based on Diameter) Protocol details N4TS 29.328 User data & interfaces IP Multimedia Subsystem (IMS) Sh interface signalling flows and message contents N4TS 29.329 User data & interfaces Sh interface based on the Diameter protocol N4TS 22.115 Charging Charging & Billing, Stage 1 S5TS 23.815 Charging Charging implications of IMS architecture S2/S5TS 32.225 Charging Charging data description for the IMS - Rel 5 S5TS 32.260 Charging IMS Charging - Rel 6

http://www.3gpp.org/ftp/Specs/

16One approach to the NGN

Managed IP network

BGWBGW

Borderproxy

Borderproxy

Inter-carrierinterface

Inter-carrierinterface

Media

Signalling

Proxy

Clear separation of each managed IP network will help to providereliable and interoperable NGN.