Soft Switch Migration

8/8/2019 Soft Switch Migration

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AT THE HEART OF THE CONVERGED NETWORK

Migration toSoftswitch Solutions

Paul BrittainProduct Manager, MetaSwitch

VON Europe 2003

London

June 11 th 2003
http://www.metaswitch.com/


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AGENDA

Introduction

Migration Models Access or core network Gateways vs. full Softswitch Business view

Engineering challenges Firewalls/NAT hassles Reliability how big should a Softswitch go?

Philosophy!


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INTRODUCTIONS

Paul Brittain Product Manager, MetaSwitch Responsible for worldwide product management and

European Sales

MetaSwitch MetaSwitch VP3500 Next Generation Class 5 Switch

Proven solution for broadband and legacy voice Nearly 30 deployments

Division of Data Connection Leading independent provider of networking and

IP applications technology Privately-owned and self-funded - stable Consistently profitable since establishment in 1981

2002: Revenue $35M, Earnings $11M

275 employees in US and UK


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MIGRATION MODELS

Simplified legacy network

LoopConcentrator

Various/ TDM

LegacyClass 5/LE

Switch

SS7/ TDMPOTS

PSTN

Class 4Tandem

Switch


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MIGRATION MODELS

Technical view of migration: Core-out replaces tandem layer using SIP or just SS7/IP

LoopConcentrator

Various/ TDM

LegacyClass 5/LE

Switch

SS7/ TDMPOTS

NGNTandem

SIP or SS7/IP


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MIGRATION MODELS

Technical view of migration: Core-out replaces tandem layer using SIP or just SS7/IP Edge-in focus on local exchanges and access network

Gateway solution possible

VoBGateway

MGCP/H.248

LegacyClass 5/LE

Switch

SS7Or SIP

MGCP/H.248or BLES

IAD

Class 4Tandem

Switch


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MIGRATION MODELS

Technical view of migration: Core-out replaces tandem layer Edge-in focus on local exchanges and access network

Gateway solution possible or full NGN

BLC or DSLAM

MGCP/H.248

SS7Or SIP

MGCP/H.248or SIP

IAD or IP Phone

Class 4/NGNTandem

Switch

VP3500

NGN Class 5Switch


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MIGRATION MODELS

Technical view of migration: Core-out replaces tandem layer Edge-in focus on local exchanges and access network

Gateway solution possible, or full NGN IP Phone/IADs or POTS via Broadband Loop Carriers

BLC or DSLAM

MGCP/H.248

SS7or SIP

MGCP/H.248or SIP

IAD

Class 4Tandem

Switch

VP3500

NGN Class 5Switch


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MIGRATION MODELS (1)

Technical View Omitted distributed CA/MG/TG/SG options for clarity

Business view Driven by network convergence savings

Both capex and opex reduced using single voice/data network

Biggest savings in the access network Carriers spend ~10x more on access equipment than on core

Some carriers hitting urgent switch capacity issues In all cases, equipment and supplier must be reliable


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SO WHAT WORKS?

Core VoIP migration already happening Even just SS7/IP using gateways can be a benefit Only addresses small portion of installed PSTN network

Much bigger savings via NGN access network Needs Class 5 softswitch with full regulatory features e.g.

Lawful Intercept for VoIP Totally IP-based solution right to customer premises Also solves issues with aging TDM concentrators Must have flexibility to deliver any service over any access

network type including POTS phone!

Minor Variations Leverage existing ATM network (if have one!) Can test the water using new services (e.g. flat-rate VoDSL)

or in new geographic areas


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CASE STUDY: FLEXIBLE DEPLOYMENT!

Next-GenerationClass 5 Switch

PSTN

eMTACMTS

DLC

ATM Switch

DSLAM

IAD

IAD

POTS

IP / Cable

T1

DSL


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ENGINEERING CHALLENGES

Firewalls & NAT Installed CPE routers mostly dont support NAT for RTP in

SIP or MGCP headers Border Session Controllers can cure this Particular issue for wholesale carriers as their ISP

customers can have overlapping addresses

Reliability limits Carrier class softswitches are, of course, reliable In theory, can build a softswitch supporting millions of lines

or even a whole network but wheres the survivability? Suggest limit single Call Agent domain to


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PHILOSOPHICAL MUSINGS

Will softswitches replace the PSTN? Yes but it will take 10-15 years.

Will the NGN be a flat network? No. Reduced hierarchy, but still need routing between

softswitch domains.

Will the future be totally mobile? No. Wireline quality will still be important in many markets

Can all service intelligence migrate to edge devices?

No. Try implementing a large Multiple AppearanceDirectory Number service with peer SIP phones!

Will VoIP avoid lawful intercept requirements? Sadly, not for long!

Documents

Soft Switch Migration