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A Light Reading Webinar

Service Quality:The Role of Session Management

Tuesday, April 29, 2008

Moderated by

H. Paris BurstynSenior Analyst, Heavy Reading

Sponsored by:
http://www.dataconnection.com/


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Agenda

Introduction

Guaranteeing SIP Service Delivery(Radware)

Data Control & QoS in IP Networks

(Data Connections)Session Managements Role in IMSEnvironments (Brix Networks)

Summary

Q&A


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Speakers

Amir ZmoraProduct Specialist

Radware

[email protected]

Jonathan CummingDirector of Product Mgt., Network Protocols Division

Data Connection [email protected]

Philip B. PowellDirector of Product Management

Brix Networks/EXFO Service [email protected]


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IMS Philosophy

Any Access& Transport

Any

Application

Session

Control

VerticalIntegration

Any AccessDevice

ConvergedNetworks

ConvergedServices

IP/MPLS Core

CSCF, MRF,BGCF


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Radware

Amir Zmora

[email protected]


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Application delivery vendor providing Full availability

Maximum performance Complete security

Address mission-critical carrier & enterprise

applications Leverage experience & technology to

guarantee SIP service delivery

Founded in 1997; public since 99; 600employees

Introducing Radware


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The Evolution of Traditional LBsIn the mid 90s Web service availability solutions

were part of the Web server/application logic

Requirements and environment changed:Traffic increased

Applications became mission-critical

New security threats introducedResult was factoring out of availability, scalability,

and security solutions to an external LB component

SIP is today where HTTP was in the late 90s


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SIP Load Balancing in Software

Static traffic distribution prefix, destination, serviceMaintenance intensive, sub-cluster planned for peak

Call dispatching first message goes throughdispatcher, following messages are direct

Complicated logic within dispatcherNo recovery from mid-call failures

Traffic broadcastingBroadcasting & hash-based decisions (MS-NLB)


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More Challenges of Current

SolutionsRepetitive development work for each application

Solutions are under application scope and notfactored out

Complex and inefficient HA model

Global disaster recovery not addressed


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ITU-OCAF 3-Tiered SIP Load-Balancing

OCAF Open Communication Architecture ForumCGOE Carrier Grade Open Environment (Rec. Y.CGOE)

Simplified & Standard Solution


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The Role of the Load-Balancer Component

Health monitoring

Local / global traffic distribution

Active-active / active-backup server activationGlobal disaster recovery

Built-in load-balancer redundancy (state synch)

Service IP virtualization (DNS SRV)

Security GW

HTTP load-balancing for converged applications


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The Role of the SIP Proxy

Simplifies application integration (outbound proxyvs. default GW)

Rule-based SIP routing

SIP application layer persistence

Transport agnostic (UDP/TCP/TLS)

Transport conversion and traffic acceleration


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SIP-ADC S1

S2

S3

ServerFarm

UA-A

UA-B

LocalNetwork

PeeringNetwork

Invit

e

Persistentrouting basedon To header

Register

Persistencemapping based

on Contactheader

Complex Routing Scenario Example


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SIP-ADC S1

S2

S3

ServerFarm

UA-A

UA-B

LocalNetwork

Peering

Network

Invite


Persistent routingbased on From

header


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SIPDirecto

r

S1

S2

S3

ServerFarm

UA-A

UA-B

Local

NetworkPeeringNetwork

InviteChallenge

The LB needs to perform routing & persistencebased on SIP rules and message content

Only an LB that functions as a SIP Proxy willsupport this



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SIP-ADC Target Applications

SIP Application Servers voice mail, voice & videoconf, IVR, ring-back tone,MS, presence/locationservices, call centers

Core Network Solutions

IMS x-CSCF andsoftswitches

SIP Border Elements

SBC clusters, mediagateways, trunk gateways


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Summary:

SIP-ADC Characteristics Ensures the reliable delivery of SIP services in carrier

environment through simplified integration providing:

High availabili ty

Scalability & performance

Interoperability

Flexibility & simplicity

Security

Reduced time-to-market

Factors out operational, architectural & developmentcapabilities


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Data Connection

J onathan CummingData Connection Ltd.

[email protected]


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0

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81 83 85 87 89 91 93 95 97 99 01 03 05 07

Employees

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81 83 85 87 89 91 93 95 97 99 01 03 05 07

Employees

Data Connection (DCL) DCL provides portable protocol software for system vendors

PNNIPNNISVCsSVCsUNIUNIIISPIISPILMIILMI

ATMATMSIPSIPMegaco/H.248Megaco/H.248MGCPMGCPDiameterDiameterSBCSBC

VoIP / IMSVoIP / IMSIP Rout ingIP RoutingBGPBGPOSPFOSPF--TETEISISISIS--TETERIPRIPPIMPIMIGMPIGMP

MPLSMPLSMPLSMPLSRSVPRSVP--TETELDPLDPVPNsVPNsVPLSVPLS

GMPLSGMPLSOO--UNI/NNIUNI/NNIEE--NNINNILMPLMP

OpticalOpticalSNA/IPSNA/IPSNAPSNAP--IXIXHIS Appl icationsHIS Appli cations

SNA/APPNSNA/APPNPNNIPNNISVCsSVCsUNIUNIIISPIISPILMIILMI

ATMATMSIPSIPMegaco/H.248Megaco/H.248MGCPMGCPDiameterDiameterSBCSBC

VoIP / IMSVoIP / IMSIP Rout ingIP RoutingBGPBGPOSPFOSPF--TETEISISISIS--TETERIPRIPPIMPIMIGMPIGMP

MPLSMPLSMPLSMPLSRSVPRSVP--TETELDPLDPVPNsVPNsVPLSVPLS

GMPLSGMPLSOO--UNI/NNIUNI/NNIEE--NNINNILMPLMP

OpticalOpticalSNA/IPSNA/IPSNAPSNAP--IXIXHIS Appl icationsHIS Appli cations

SNA/APPNSNA/APPN

Products & Customers

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82 84 86 88 90 92 94 96 98 00 02 04 06

Profit

Total Revenue

Revenue & Prof it

$m

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Revenue & Prof it

$m


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The Need for Session Control

What gets dropped?

What gets delayed?

File

sha

ring

Trusted

Core

Vid

eoVoice

DoS


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QoS Requirements

Ban

dwidth

/bps

Round-trip latency / ms

Telephony

VideoTelephony

RemoteDesktop

200 400

64K

8K

G.711

G.729a

1M

FileTransfer

800600

Email


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Implementing Access Control

Classification

Dropunauthorized

WeightedQueuing

Dropto limit

bandwidth

Policy

Enforcement

Network Edge

IP/MPLS

- Dynamic or static LSPs

- Aggregated flows

Ethernet

- Over-provisioned links

Trusted

CoreUntrusted

Access

L

abeling&

Routing


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QoS for Media Sessions Identification of authorized media flows

Media separate from signaling

Authorization based on bandwidth

Monitoring of actual bandwidth use

SBC identifies and controls session-based traffic toenable network prioritization and prevent congestion

Untrusted

Access

Media overQoS links

Session

Border

Controller

SIP

signaling

Media

Trusted

Core

SIP

signaling


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SBC Deployment Models

Media

SIP signaling

Media

SIP

signaling

Media

Media

Trusted

Core

MediaProxy

Integrated SBC

SignalingProxy

Call Agent/Softswitch

SIP signaling

SIP

signaling

MediaProxy

Distributed SBC

SignalingProxy

Call Agent/Softswitch

H.248

controlSIP

SIP

SIP

SIP

SIP

SIP

Untrusted Network

e.g. DSL over ATM

Untrusted Network

e.g. Ethernet

Q S I O f M SBC R l


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QoS Is One of Many SBC Roles

Policy-basedcall routing

Policy-basedcall routing

LawfulinterceptLawful

intercept

Connectivity

NAT &firewall

traversal

NAT &firewall

traversal

TranscodingTranscoding

Protocolinterworking

Protocolinterworking

Protocolrepair

Protocolrepair

Topology hidingTopology hiding

Call accountingCall accounting

Emergencyservice

Emergencyservice

Regulatory

Security

PrivacyPrivacy

Services

EncryptionEncryption

Access

Control

Access

Control

S i B d C t l i IMS


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Session Border Control in IMS

MRF

Service or

Appl ication Plane

Transport or

User Plane

Access

HSSAS

IMS-MGW

I-CSCF

/ THIG

CSCF

MRFC

Broadband

WLAN

GPRS/UMTS

BAS / A-BGF /

PDG / GGSN

RACS / PDF

IPv4/ IPv6Core

BGCF

I-BCF / ALG

Signaling orControl Plane

IMS

Signaling

IMS Media

MGCF

SGW

MRFP

P-CSCF

S-CSCF

IPv4 / IPv6Network

PSTN

NASS

I-BGF / TrGW


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Session Managements RoleIn IMS Environments

Philip B. PowellBrixNetworks/EXFO Service

[email protected]


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About Brix Networks Global provider of open and extensible converged

service assurance solutions

Allow the worlds largest service providers and enterprises

to offer reliable and high-quality experiences in voice, video,data, and mobile services

Proven heritage of IP expertise unique to the service

assurance marketplace

Integrated software and hardware products thatassure the delivery of any IP-based service, over

any network, to any endpoint

Recently acquired by EXFO


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OSS in Todays Networks

Traditional networkCDR generation in callcontext

Call length in minutes Features available to the subscriber

Voice mail, call forwarding, call waiting

Data transfer in kbit/s

Session defined by amount of data transferred

Reporting completed by network elements SS7 network elements, softswitches

Reporting validated by signal monitoring systems CDRs fed to OSS/BSS systems

OSS i h S i i


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OSS in the IMS Transition

CDR metrics continue to be required for networkmanagement

Call & data plans continue to be sold on minutes &bytes downloaded as network transitions

Additional metrics must be reported and validated

Sessions may include multiple instances of todaysservices

Additional information will come from new architecture SCIM, CSCF, SBC, media server, app server

New protocols will standardize delivery of billing data Diameter protocol eliminates OSS system connectors

Looking Beyond Signaling


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Looking Beyond Signaling

For Billing & Mediation Merging of voice, video & data traffic requires reportingof new metrics

Signaling informationcontinues to be valuable,but only part of theservice delivery puzzle

Media quality informationis essential

Introduces the concept of an end-user service-level agreement(SLA) as a billing methodology

Guaranteed quality of the service being delivered based onmeasurements of the actual media traversing the network

Media Quality Challenges


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Media Quality Challenges

Media routing is dynamic SBCs provide a single point of network access

Gateways provide network transitions

Media servers provide in-network resources

Appropriate measurements are still in definition Mean Opinion Score (MOS) for voice

Media Delivery Index (MDI), Media Quality Index

(MQI), Video Quality Index (VQI) for video Latency, loss, jitter for data

Delivery method for these measurementsleverages existing standards

RFC 3611 RTCP-XR SNMP

SIP & Diameter transport mechanisms

Assuring the Service


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Assuring the Service

Quality-of-service metrics are key in theIMS architectureOverall user experience must be measured

for all services usedCorrelated view of signaling & media isrequired to capture the quality of the session

Network elements must report standardmetrics for mediationEndpoints will be leveraged for future servicevalidation Mobile phones, converged devices, ATAs, STBs

Common algorithms must be used tocalculate defined QoS metrics

Service Assurance Challenges


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Service Assurance Challenges

In the IMS transitionCustomer place shiftingDevices will be entering through various connection

methods & access points ATA taken on the roadServices are expected across all devices

VOIP services through mobile Web interfaces

Feedback from quality assurance system mustbe used to adjust service delivery to an endpointCarrier network should leverage IMS network elements

to adjust bandwidth & QoS levels for highest quality &SLA managementUser expectations must be managed as new billing

systems & customer SLAs are initiated

Additi l C id ti


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Additional Considerations

Service assurance in IMS goes beyond faultmanagement & availabilityPassive monitoring of the network allows a view of

service qualityFeedback mechanisms between systems will allow

adjustments of network treatment on a per-sessionbasis

Customer expectations based on new SLAs willchallenge traditional billing methods

Customer lifecycle management is key to effectiveservice delivery

S i A


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Service Assurance Executive-level reporting

IMS pilots are being tracked closely at executive level and needconsolidated views of network health and quality

SLAs will range from carriers to end users Core-to-edge service guarantees and proof of service availabilityand quality are vital

Individual QoS will be tracked and guaranteed

Network operations and network engineering Many points of access will need to be monitored

Applications running for a user may not be in the same networkas the user

Network sizing and requirements for new service launch must bevalidated, monitored, and fixed

Devices will be enabled through standards to report on quality

Audience Poll


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Which session management device(s)do you plan to integrate/deploy

in the next 12 months?

SIP load balancer

Session border controllerSession/service monitor

All of the above

Two of the three

None of the above

Audience Poll


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Q&A

lr service quality a pr 08

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