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Path to Reality for Internet Telephony. [email protected] Disclaimer: These may or may not be the opinions…. Overview. Business case for IP telephony protocols IETF-ITU Progress: PINT/SIP QoS and Service Agreements Security Charging Lowest Cost ALL IP Networks

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Path to reality for internet telephony

Path to Reality forInternet Telephony

[email protected]

Disclaimer: These may or may not be the opinions….


Overview
Overview

  • Business case for IP telephony protocols

  • IETF-ITU Progress: PINT/SIP

  • QoS and Service Agreements

  • Security

  • Charging

  • Lowest Cost ALL IP Networks

  • Is H.323 setting back Internet Telephony?

  • Telephony Signaling and Device Control

Henry Sinnreich


Ip tel protocols have a business case

Telephony

Moves to IP

Most telecom revenue

Least of traffic

How much cheaper?

Internet

Data is critical

Most traffic is data

Telephony is just another IP service

IP Tel Protocols Have a Business Case

There is no business case for another telephony network (VoIP)

Telephony becomes another Internet feature

Design protocols to support and to integrate it well

Henry Sinnreich


Pstn internet pint

PINT

CLIENT

SERVER

SCP/IN

PSTN

or

PBX

WWW/IP NETWORK

PSTN-Internet (PINT)

  • C->S: INVITE [email protected] SIP/2.0

    • Via: SIP/2.0/UDP 169.130.12.5

    • From: [email protected]

    • To: 1-800-IRON-YES

    • Call-ID: [email protected]

    • Subject: Sale of Ironing Boards

    • Content-type: application/sdp

    • Content-length: …

    • v=0

    • o=- 53655765 2353687637 IN IP4 128.3.4.5

    • I=Ironing Board Promotion

    • c= TN RFCxxxx +1-201-406-4090

    • m=audio 0 voice

Request to Call

Request to Fax

Request to Hear Content

Henry Sinnreich


ITU-T Q.5/11, dated May ‘98

Management Relationship

PUAF

IN Service Control

Bearer Connection Control

Internet

SIP

network boundary

SCGF

C/BGF

MGF

PSTN

SCF

SDF

SMAF

SMF

SSF

SRF

SCEF

CCF

SCGF Service Control Gateway Function

SDF Service Data Function

SMF Service Management Function

SMAF Service Management Agent Function

SRF Specialized Resource Function

SSF Service Switching Function

CCF Call Control Function

C/BGF Call/Bearer control Gateway Function

MGF Management Gateway Function

PUAF PINT User Agent Function

SCEF Service Creation Environment Function

SCF Service Control Function

PINT: ITU SG.11 Functional Architecture for IN/Internet

Henry Sinnreich


Qos service level administration

Policy Architecture

Management Tool

Repository Client

Repository access

protocol

Policy Repository

(Directory, DB, etc.)

Repository access

protocol

Repository Client

Policy Decision Point

(PDP)

Policy Enforcement Point

(PEP)

QoS Service Level Administration

LDAP

Management

Tool

Directory

Policies

PDP

PEP

PEP

Access

Network

Other

Network

Edge

Router

Edge

Router

Backbone

Admin. 1

Backbone Administration

Admin. 2

  • Access net: Integrated Services

  • Backbone: Differentiated Services

  • Service Policy Rules in directory

  • Policy Architecture:

    • Directory

    • Policy Decision Point (PDP)

    • Policy Enforcement Point (PEP)

Policy protocol

Henry Sinnreich


Policy and accounting for sip

Proxy Policy

Server

Proxy AAA

Server

ngIN

possibly

Home

Server

SIP Proxy

Server

Policy and Accounting for SIP

AAA

messages

  • Policy events:

    • INVITE

    • ACK

    • CANCEL

    • BYE

AAA

messages

SIP

msgs

SIP

messages

SIP

msgs

SIP Proxy

Server

AAA

Client

SIP

client

SIP

client

Callee

Caller

Henry Sinnreich


Ip virtual private network extranet

PSTN

IP Virtual Private Network - Extranet

  • Authentication

  • Routing

  • QoS

  • Transactions

  • AAA:

  • Authentication

  • Authorization

  • Accounting

  • Roaming Operations

Credit verification & payments

Iptel

Gwy

Internet

encrypted

tunnels

Security

Gwy

Security

Gwy

Intranet

Intranet

  • Tunneling protocols:

  • IPSEC

  • L2TP, MPLS

Henry Sinnreich


Example integrated messaging with rtsp and sip e mail for call centers
Example: Integrated Messaging with RTSP and SIPE-mail for call centers

Send personal information to customers

1. INVITE

SIP

SERVER

MAIL

CLIENT

5. e-mail URL

A/V

CLIENT

2. LOCATION

3. Setup

RECORD & PLAY

RTSP

4. VOICE MENU

and

RECORD a/v MSG

Interactive voice response (IVR)

6. A/V MSG STREAM

MEDIA

SERVER

MEDIA

PLAYER

RTSP

Henry Sinnreich


Heterogeneous, redundant and large overhead

All IP

IP

Servers

IP Servers

Gate-

keeper

IN

AIN

Servers

Web/IP

Applications

IS & NM/SNMP

H.323

IPTel

Mail

Web

POTS

TDM

IP

Web/IP based Information Systems & NM

IP/MPLS

Information Systems & TMN/CMIP/OSI

ATM

Gigabit Ethernet

SONET

WDM/Fiber

  • Savings:

    • Software & Systems

    • Bandwidth

    • Duplicating equipment

ITU Telecom

Fiber

ITU IMTC

IETF

Lowest Cost All IP Architecture

Henry Sinnreich


Is h 323 holding back internet telephony
Is H.323 holding back Internet telephony ?

  • PC’s give IP telephony a bad image - tough PC problem

  • H.323 was not designed to be an Internet telephony standard - but H.3xx extension for IP, IPX LANs

  • Management Babylon: TMN/CMIP/OSI plus SNMP

  • Interoperability dead end: Shortcuts from ITU std’s

  • Waste of bandwidth: 20 byte voice + 40 byte overhead

  • Codecs can’t adapt to Internet - though RTCP is there

  • No fit with Internet security (RAS vs. AAA and firewalls)

  • Duplication with IN/AIN and Internet servers

  • 3rd network routing & tables: Gatekeeper zones

  • WWW unaware - no fit for XML, VoXML - what future ?

Henry Sinnreich


Interoperable ip telephony gateways

AIN/IN

NCP

SS7 TCAP

SS7

ISUP

?

SIGNALING

GATEWAY

?

inter

GWY

?

PSTN

GATEWAY

CONTROL

?

INTERNET

RTP

IMT

MEDIA

GATEWAY

Interoperable IP Telephony Gateways

GWY Protocols ?

  • ISO/IEC DSM-CC

    User-Network Protocol

  • NOTASIP

    Nothing Other Than A Simple Internet Phone

  • SGCP

    Simple Gateway Control Protocol

  • RSGP

    Reliable Signaling Gateway Ctrl. Prot.

  • DIAMETER series

    Twice RADIUS

  • IPDC series

    Six IP Device Control Protocols

  • Etheric

  • DTR/TIPHON 020004

  • SIP with PIP extensions

VOICE, FAX, DATA

Henry Sinnreich


Gateway signaling schema

GWY

GWY

GWY

GWY

GWY

RTP

MUX

Gateway Signaling Schema

SS7 ANSI

TCAP/SS7

SS7 ETSI

IN

ctrl

SS7 AIN

SIP/IP

Signaling

ISUP/SS7

Sig.

GWY

ctrl

PSTN

IMT

Media

GWY

ISDN

T1 Signaling

RTP

Internet

Henry Sinnreich


IP Telephony DevicesSignaling and Control

  • PSTN-IP gateways

  • Interactive voice response units

  • Automatic call distributors

  • Voice recognition & understanding

  • Conferencing bridges

  • Pay phones - web kiosks

  • …. Other

    IETF: How many and what protocols ?

Henry Sinnreich


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