SS7 Bob Wright's Presentation

Signaling System 7 Slide 1Presenter: Bob Wright

Signaling System 7

Signaling System 7 Signaling System 7 1.1. PSTN and TDMPSTN and TDM

2.2. SS7 State of the SS7 State of the TechnologyTechnology

3. Future Trends in 3. Future Trends in Signaling and NetworksSignaling and Networks


Objectives

Define the role signaling plays in Define the role signaling plays in a networka network

Compare the different types of Compare the different types of applications which use SS7applications which use SS7

Describe at least one type of call Describe at least one type of call flow through the network using flow through the network using SS7, typical of long distance SS7, typical of long distance callingcalling

Describe how SS7 enables Local Describe how SS7 enables Local Number Portability (LNP) and Number Portability (LNP) and cellular roamingcellular roaming


Signaling System 7

40%

Pre-SS7Pre-SS7- Per-trunk signaling (PTS)- Tones or multiple frequencies (MF)- Trunk provides monitoring and

supervision- Signaling within the talk path

CO AClass 5 Office

CO BClass 4 Office

CO CClass 4 Office

CO DClass 5 Office

MF Trunk#55

MF Trunk#92

MF Trunk#1221

973-XXX-5678

972-516-1234


Signaling System 7 Making a call over the Public Making a call over the Public

Switched Telephone NetworkSwitched Telephone Network- Off hook- Dial some digits- Talk to someone anywhere in the world- Network figures out where to route the call

Set up call instantlyTear down the call as quickly

- Behind the scene is the backbone of signaling systems

- Subsecond call setup and teardown is the goal Evolution of signaling systemsEvolution of signaling systems

- Legacy systems- Common Channel Interoffice Signaling System

Number 7- Save time and money on the network- Introduce new features and functions in an

intelligent network


Signaling System 7: Purposes

Some Purposes of SS7 NetworkSome Purposes of SS7 Network Look ahead to determine status of called

number, reserving not occupying the talk path

1 second call set up and tear down Integration of supervision, monitoring,

billing systems Enable introduction of additional features

and capabilities Access remote data bases, look up and

translate information from 800 and 900 calls

Marry various stored program-controlled systems in the world


Signaling System 7: Why Out-of-Band?

Advantages over in-band Advantages over in-band signalingsignaling Enables transport of more data at

higher speeds (56 Kbps, faster than MF)

Enables signaling at any time in the entire duration of the call

Enables signaling to network elements to which no direct trunk connection is available (Advanced Intelligent Networks)


Signaling System 7: Architecture

Components Components

Signal Switching Points (SSP) Signal Switching Points (SSP) are telephone switches that are telephone switches that generally originate, terminate, generally originate, terminate, or switch calls, the node that or switch calls, the node that provides dial tone.provides dial tone.

Signal Transfer Points (STP) are Signal Transfer Points (STP) are the packet switches of the SS7 the packet switches of the SS7 network. network.

Signal Control Points (SCP) are Signal Control Points (SCP) are the databases that provide the databases that provide information necessary for information necessary for advanced call-processing advanced call-processing capabilities.capabilities.

STP

SSP

SCP


Signaling System 7 Basic call setup

Voice Circuit

STPSS7 LINKS

1a. IAM

1b. IAM

2a. ACM

2b. ACM

3a. ANM

3b. ANM

4a. REL

4b. REL

5a. RLC

5b. RLC

IAM initial address message

1

3 ANM answer message (initiate billing)

4 REL release message, cause

2 ACM address complete message

5 RLC release complete message (terminate

billing)

* CONVERSATION TAKES PLACE

STP

SSPSSP


Signaling System 7: Architecture

SS7 SS7 Architecture Architecture Basic QuadBasic Quad LINKS


Signaling System 7

SS7 ApplicationsSS7 Applications 800/888/877/866/900 services Enhancements in 800/888/877/866 call

centers 911 enhancements Class features Calling card toll fraud prevention Credit card approval, authentication Software/virtual defined private networks Call tracing Call blocking


LNP and Signaling System 7

Three phases of LNPThree phases of LNP Service provider portability:

change telco, keep same number Service portability: want services

not available at local end office, change switch, keep same telco, keep same number

Location portability: customer moves far away from area serviced by telco, the further the more technical challenge to LNP, keeping same number



Telecommunications Act 1996 goal:Telecommunications Act 1996 goal: seamless and transparent

comunications for the consumer, with a choice of providers

Major issuesMajor issues Explain why the FCC is so adamant

about using LNP explain the need to preserve our

telephone numbering systems physical interconnection settlements between carriers for

access and co-carrier charges


Signaling System 7 and Key points of LNP

Demand for LNP and differences Demand for LNP and differences between wireline and wireless between wireline and wireless carriers for LNPcarriers for LNP

Wireless churn and fraud Location NP

- Database dips (LECs, ILECs, IECs and CLECs)- 911 issues- Billing issues

Describe the new components of Describe the new components of LNP architectureLNP architecture



Basic LNP NetworksBasic LNP Networks



Wireline E-911Wireline E-911

ANI = automatic number ID AMA = automatic message accounting CAMA = Centralized AMAPSAP = public safety answer pointALI = automatic location information



Wireless E-911Wireless E-911

PSAP = public safety answer point

GPS to locate caller

ALI = automatic location information,and x,y coordinates


SS7 and Roaming Capabilities

Mobile registrationMobile registrationMSC= mobile switching centerVLR = visiting location registerHLR= home location register


SS7 and Roaming Capabilities

Incoming call to idle mobile setIncoming call to idle mobile set


Signal System 7 Summary

Summary on SS7Summary on SS7 Call setup, administration, and tear

down have changed to an out-of-band separate signaling system called SS7

The SS7 architecture makes it possible to reduce costs, implement many new applications, and integrate wired and wireless networks

SS7 makes it possible to implement LNP and roaming, two essential services for subscribers and businesses


Signaling System 7: Change Management and Leadership Issues

LNP implementation issuesLNP implementation issues Coordination between telcos

- Scheduling- Installation responsibilities

Customer care end to end E911 problems, especially wireless

Roaming servicesRoaming services Mode: analog, CDMA, GSM Applications: voice, data, video Billing and customer care

Who is in charge?Who is in charge? Telcos large and small Government Subscriber


Future trends in networking and signaling

The Move Towards All IP The Move Towards All IP NetworksNetworks

Forecasted explosion in data Forecasted explosion in data traffic traffic

Internet protocol (IP) Internet protocol (IP) networks such as long term networks such as long term evolution (LTE)evolution (LTE)

Worldwide interoperability for Worldwide interoperability for microwave access (WiMAX).microwave access (WiMAX).



EconomicEconomic – the need to reduce – the need to reduce data transport costs. data transport costs.

a hedge against becoming a bit a hedge against becoming a bit pipe pipe

reducing data transport costs, reducing data transport costs, MNOs could operate a data MNOs could operate a data network profitably. network profitably.

IP-based protocols also open the IP-based protocols also open the door for MNOs to deploy advanced door for MNOs to deploy advanced IP-based messaging services IP-based messaging services

reduce equipment deployment reduce equipment deployment



SS7 could help the Internet by SS7 could help the Internet by providing: providing: Improved reliability: extensive

continuity testing, access switch automatically signals the network to reroute the calls to another switch without affecting the service

Better bandwidth utilization: SS7 signaling takes place out-of-band

Load balancing: more efficient use of ISP equipment and no busy signal



IMS enables wireless convergence (IP IMS enables wireless convergence (IP Multimedia Subsystem) based on a 3GPP Multimedia Subsystem) based on a 3GPP variant of SIPvariant of SIP

Year 2002 wireless subscribers exceeded Year 2002 wireless subscribers exceeded wireline globallywireline globally

IMS relies on Session Initiation Protocol IMS relies on Session Initiation Protocol (SIP) to establish and maintain call (SIP) to establish and maintain call control control

SIP is becoming the signaling protocol of SIP is becoming the signaling protocol of choice for VoIP choice for VoIP

SIP brings with it the advantage of SIP brings with it the advantage of presence to multimedia, concurrent presence to multimedia, concurrent sessions sessions



LTE is part of the GSM LTE is part of the GSM evolutionary path beyond 3G evolutionary path beyond 3G technology, following technology, following EDGEEDGE, , UMTSUMTS, , HSPAHSPA ( (HSDPAHSDPA and and HSUPAHSUPA combined) and HSPA Evolution (combined) and HSPA Evolution (HSPA+HSPA+) )

LTE overall objective is to provide LTE overall objective is to provide an extremely high performance an extremely high performance radio-access technology that radio-access technology that offers full vehicular speed offers full vehicular speed mobility, mobility,

LTE assumes a full Internet LTE assumes a full Internet Protocol (IP) network architecture Protocol (IP) network architecture

http://www.3gamericas.org/index.cfm?fuseaction=page&sectionid=244








Network Interconnection & Network Interconnection & RoamingRoaming


Application data bases and Application data bases and scalabilityscalability

Provisioning and Database SynchProvisioning and Database Synch



Mobile Tweet Publishing Mobile Tweet Publishing ArchitectureArchitecture




Efficient SMS-Based Tweet Efficient SMS-Based Tweet DeliveryDelivery

Using FDA (First Delivery Using FDA (First Delivery Attempt)Attempt)


CONCLUSIONS

SS7 over IP is the evolution for SS7 over IP is the evolution for signalingsignaling

Star shaped networkStar shaped network Clear migration path to IMSClear migration path to IMS Centralized implementation Centralized implementation Predictable and reliable Predictable and reliable

network performancenetwork performance Architecture must be robust, Architecture must be robust,

able to cover hugh network able to cover hugh network performance requirementsperformance requirements


Signaling System 7: Research to Prepare

Thank you very much.Thank you very much. Careers Software, hardware Many aspects of network

configuration Revenue generation and

protection Robert B WrightRobert B Wright

SS7 Bob Wright's Presentation

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