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A Scalable SIP-based Architecture to Offer Value-added Services in a Converged IN/IP Environment

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A Scalable SIP-based Architecture to Offer Value-added Services in a Converged IN/IP Environment F.S.Salloum, Tasos Dagiuklas, Maria Skoura 16 January 2003 – PowerPoint PPT presentation

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Title: A Scalable SIP-based Architecture to Offer Value-added Services in a Converged IN/IP Environment


1
A Scalable SIP-based Architecture to Offer
Value-added Services in a Converged IN/IP
Environment
  • F.S.Salloum, Tasos Dagiuklas, Maria Skoura
  • 16 January 2003
  • International SIP 2003

2
Outline
  • The Problem
  • Existing IN Service Architectures
  • SSP, SCP
  • Limitations from existing IN architecture
  • Convergence between IP PSTN
  • Services in a converged environment
  • GEMINI proposed Architecture
  • Multiple zones,IP-SSP,IP-SCP,E-SCP
  • Examples
  • Conclusions

3
The Problem
  • To offer in a converged environment existing and
    next generation customized personalized services
    that meet the demands of multiparty
    multi-connection and multimedia calls.

4
Existing IN Service Architecture (1)
5
Existing IN Service Architecture (2)
  • Service Switch Point (SSP)
  • Physical embodiment of the Service Switching
    Function (SSF)
  • Connects through INAP with the Service Control
    Function (SCF) which is embodiment on the Service
    Control Point (SCP)
  • Includes an instance of a special Basic Call
    Process Service Independent Building Block
    (BCP-SIB)

6
Existing IN Service Architecture (3)
  • Service Control Points (SCP)
  • Physical embodiment of the Service Control
    Function (SCF) which controls the execution of
    services.
  • SCF contains the Service Logic Execution
    Environment (SLEE)
  • The incoming SIBs are executed in the form of
    Service Logic Programs (SLPs).

7
Existing IN Service Architecture (4)
  • Service Creation Environment (SCE)
  • Physical embodiment of the Service Creation
    Environment Function (SCEF)
  • The SCEF is actually an offline function for the
    creation of service logic from the SIBs
  • Service Management Platform (SMP)
  • Physical embodiment of the Service Management
    Function (SMF) and of the Service Management
    Access Function (SMAF)

8
0800 IN Service Example Flow
9
VoIP Value-Added Services Roadmap
Service Driven Networks(PSTN, SS7)
Hybrid networks
CTI
Data networks
NGN networks
VoP networks
Access Networks (wireless, Cable)
Now
Migration Path
10
Limitations from existing IN
  • The service logic is based on specific
    manufacturers SLEEs
  • Not always write once run everywhere
  • Variations of IN call models
  • IN cannot be supported fully with existing IP
    infrastructure only partially through ISUP
    signalling
  • Problem to integrate with 3G and future mobile IP
    users
  • Primitive User Interfaces
  • Limited capabilities regarding multimedia support.

11
Convergence between IP PSTN
  • Technical Drivers
  • IP has been adopted as a unified transport in the
    corporate, enterprise, access and core networks
  • Use of Open APIs to rapidly deploy and customise
    personalised services
  • Regulatory Drivers
  • Deregulation of the telecommunication market
  • New entranets (i.e. greenfield operators, service
    providers)
  • Business Drivers
  • New Players in the Value Chain
  • New Business Model

12
Services in a converged environment
  • PSTN user access to IP services
  • IP user access to PSTN services (Call waiting,3rd
    party conference, voting)
  • Presence and redirecting services
  • Multiple Call Handling
  • Click to services (dial,fax etc)

13
GEMINI proposed architecture
PSTN
IP
14
Multiple Zones (1)
  • Under each IP-SSP responsibility there is a
    certain number of hierarchical SIP servers,
    within a zone.
  • Service requests are forwarded at the SIP server
    residing at the top of this hierarchy
  • Two service categories
  • 800_at_domain.com for accessing IN/PSTN services
  • in_ip_at_domain.com for accessing SIP-based services

15
Multiple Zones (2)
  • Each zone has direct connection with the SS7
    world

16
Multiple Zones (3)
  • Alternatively, there is one IP-SSP that
    communicates directly with the Signaling Gateway

17
IP-SSP System Overview
IP-SSP in GEMINI architecture is a decomposed
architecture consisting of existing of the self
equipment (MG,SG,SCG) and glue modules (Soft
switch with H.323toSIP and conference bridge).
1.SCG (Service Control Gateway) Transports INAP
2.SG (Signaling Gateway) Transports ISUP/Q931
3.MG (Media Gateway) PCM??RTP
4.Softswitch (MGC) MEGACO ??SIP
5.Conference bridge Low class (3rd Party)
6.H.323 to SIP For supporting existing H.323
infrastructure
18
IP-SSP Functionalities
  • Service Control Gateway
  • Handles the transportation of INAP messages from
    the SS7 world to the IP world (using SIGTRAN) and
    vice versa
  • Media Gateway
  • Handles the transcoding between PCM and RTP
  • Signalling Gateway
  • Handles the trasnportation of ISUP messages from
    the SS7 world to the IP world (using SIGTRAN) and
    vice versa
  • Softswitch
  • Contains the equivalent SSF and BCP-SIB logic of
    the SSP in the PSTN world
  • MEGACO for controlling the MG and SG
  • SIP for connection to the SIP network
  • ISUP to SIP and INAP to SIP handlers
  • Conference Bridge
  • Low class for supporting 3rd party conference
    calls.
  • SIP to H.323 translation
  • For connecting with an existing H.323 network
    either with an H.323 GK or directly. Fast start
    is preferred to be used for minimizing call
    setup.

19
IP-SSP Protocol Stack
20
IP-SCP Overview
  • Provides an application execution environment to
    the services
  • By using Java and standard Service Creation APIs
    we support write once run everywhere concept
  • The Service Creation Environment can be
  • IP-everywhere.

21
IP SCP Architecture
22
E-SCP Functionalities
  • Extension of a current SCP supporting capability
    set 4 (CS4) enabling multimedia and multiparty
    support
  • Forwards INAP SS7 messages to the IP world
    according to SIGTRAN using SCTP
  • Provisioning of IN service logic and the IP/IN
    extension services
  • Provisioning of IN service-customization
    capabilities for the IP domain.

23
Hybrid Call Forwarding (1)
24
Hybrid Call Forwarding
  • MSC for the Hybrid
  • Call Forwarding in
  • GEMINI architecture

25
Hybrid Conference Call
26
Conclusions
  • Converged Architecture to support existing IN and
    next generation services in a converged SS7/PSTN
    and IP environment
  • This convergence has been addressed using SIP
    technology

27
Acknowledgments

IST-2001-33465 Project GEneric Architecture for
custoMised IP-based IN services over hybrid
Voice over IP and SS7
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