SIP & SS7 (SIP-02)Monday - 09/10/07,  10:00-10:45am

SIP-SS7 Interworking @ the Application Layer

Vince LeschVP of Product Marketing

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

Agenda

• Network Evolution• Key Transitional Challenges• Seamless Connectivity• Service Deployment and Access

– SCIM– IM-SSF

• NGN Control Layer

• The Build Out Steps

• Summary

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September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

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Network Evolution - Growing the NGN

PSTNRegion

PSTNRegion

• Cost Reduction at the Core through VoIP

PSTNRegion

SIPPBX

PBX

IADVoIPEnd-Point

• Expansion of VoIP to Enterprise & Residential

SIPServices

• Introduction of services based on SIP application servers

SBC

SBC

VoIP

VoIP

VoIP

EdgeProxy

EdgeProxy

• VoIP Peering

RAN MG

A/Abis

RAN MG

A/Abis

MSCServer

• R4 MSC servers introduction

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

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Key Transitional Challenges

• Technical Challenges– Mergers & acquisitions have resulted in operators supporting

several versions and variants of the same product & protocol – Seamless service connectivity across hybrid networks– Legacy system connectivity to newer systems– Systems integration and multi-vendor interoperability– Stability of standards, vendor implementation of standards

• Business Challenges– Investing in the future while supporting today’s users– Capping expenditures in the “pre-IMS” technology– Cost effectively running a hybrid network– Providing new services to subscribers on old & new networks– Making the business case for IMS work

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

Seamless Connectivity

• TDM for access, IP at the core for transport• Interworking between ISUP and SIP for call completion.

BICC (Q.1902) used in 3G R4 architectures is based on ISUP which simplifies interworking

• IETF, ITU-T and 3GPP Standards for ISUP & SIP Interworking: RFC 3372/3398, Q.1912.5, 29.163

PSTN/ISDN

PSTN/ISDN

LE

PSTN/ISDN

PSTN/ISDN

LE

CallServer

ATM, IPbackbone

BICC, SIPCall

Server

SS7ISUP

SS7ISUP

MediaGatewayMediaGateway

MediaGatewayMediaGateway

SIPAS

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September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

IMS Architecture for Svc Provisioning

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S-CSCFS-CSCF

SIP Application Server

SIP Application Server

HSSHSSOSA service

capability server(SCS)

OSA service capability server

(SCS)

IM-SSFIM-SSF

Camel Service Environment

Camel Service Environment

OSA application

server

OSA application

server

ISC

Cx ISC

ISC

CAP

MAP

OSA API

SCIM

AS AS

Sh

Si

MRFCMRFC

Mr

Source: TS 23.218 IP Multimedia (IM) session handling; IM call model;Stage 2

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

SCIM

Service Orchestration & Mediation

IMS-to-IN (SIP-SS7)Exposing legacy services into IMS

domain (Ex. LNP in IMS domain)

IN-to-IMS (SS7-SIP)Access to next generation

applications (Ex. LHS & MHS)

IN-to-IN (SS7-SS7)Mediates services implemented using

different technologies (Ex. CAMEL Consolidation)

IMS-to-IMS (SIP-SIP)SCIM functionality mediates SIP

services in the IMS World (FMC, MM-IM & Presence)

Service Orchestration & Mediation

STPFunction

CSCFFunction

MGCF

VirtualSIP AS

VirtualSSP

LNP

CNAM AIN

1188 AIN

VirtualSCP

SSP MSC

VirtualSIP UA

VoiceAS

SSP

IN AIN

MGCF

VCC

MM-IM

Presence

Bridging IN/AIN & IMS Applications 8

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

Service Orchestration & Mediation

Vendor 1

MSC/SSP

Vendor 1

MSC/SSP

BillingControl

BillingControl

PRBTPRBT

VPN/LNPVPN/LNP

Expensive to add multiple protocols

Vendor 2

MSC/SSP

Vendor 2

MSC/SSP

PresencePresence

SIP App Server

SIP App Server

SoftSwitch/CSCF

SoftSwitch/CSCF

New Network Services

Inte

rac

tio

n

VirtualSCP

VirtualSCP

SubscriberSubscriber

Med

iati

on

VirtualSIP AS

VirtualSIP AS

Service Orchestration (SCIM)• Interaction across multiple

CAMEL and IMS Application Servers

Service Meditation (IM-SSF)• Mediate between CAMEL and

SIP Service Clients/Server nodes

• Mediate between SS7 variants

Variations• SS7 only• SIP only• SIP & SS7

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Network AND market requirement to combine SCIM and IM-SSF functionality into one product

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com10

SIP Signaling Router = SIP STP

PSTN

SIP AS(B2BUA)

SIPPBX

PBX

IADVoIPEnd-Point

SBC

SBC

VoIP

VoIP

VoIP

EdgeProxy

EdgeProxy

RAN MG

A/Abis

RAN MG

A/Abis

MSCServer

SIP STP

• Cost Reduction at the Core through VoIP

• Expansion of VoIP to Enterprise & Residential

• Introduction of services based on SIP application servers

• VoIP Peering• R4 MSC servers introduction

• Scalable signaling infrastructure

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

Current NGN Implementation

- IP layer routers- IP routing protocols- IP QOS controls

SIPAS

SIPAS

PSTNGW

MSCServers IP

PBX

SIPEnd-Points

Multimedia ServersSoftswitch

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Distributed policies and information

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

NGN 2.0: Dedicated SSR Session Layer

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Multimedia Servers

- IP layer routers- IP routing protocols- IP QoS controls

SIPAS

SIPAS

Softswitch

PSTNGW

MSCServers IP

PBX

SIPEnd-Points

Session RoutingEngine

Session RoutingEngine

Session SetupURI Routing

Service OrchestrationIOT Point

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

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The Build Out Steps

TDMMSC

STP

SIPAS

SIPAS

IMSVoice AS

Service Orchestration (SCIM) AND Mediation (IM-SSF)

CAMELINAP

SMSC

Multimedia IM

IMS Media Server

SSR

SIP Media Server

Softswitch

Softswitch

SigtranISUP/INAP

SoftswitchTransit

MGC/MGCF

S-CSCF

I-CSCFP-CSCF

September 10-12, 2007 • Los Angeles Convention Center • Los Angeles, California

www.ITEXPO.com

Summary

• Network evolution present operators with many challenges– Network – operating a hybrid network for many, many years

– Services – consistency across networks and transparency to the customer

– Business – proving in the business case (leverage what you’ve got)

• Migrating at the signaling control layer … a logical choice– Service mediation (IM-SSF) & interaction (SCIM) across pre-IMS & IMS domains

– SIP signaling & session control layer in the NGN brings benefits now

– Unified Signaling Control Plane: SS7 STP = SIP STP = IMS CSCF

• Transitional technologies will be key for the next 3 - ? years• Minimize investment in “pre-IMS” technologies

• Service continuity across hybrid networks

• Leverage existing investment in key IN/AIN applications (e.g., number portability) by making them available to both domains during transition to IMS

• A good transitional strategy is essential to making the IMS business case work

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