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IP TAX Project

This project aims to migrate the Public Switched Telephone Network (PSTN) to a Next Generation Network (NGN) by implementing IP-based technologies and introducing various network components.

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IP TAX Project

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  1. IP TAX Project Presented by : R. K. Kaushik, Jt. DDG (TAX)

  2. NGN Concept Service / Application Layer Control Layer PSPDN PLMN PSTN Transport Layer Access Layer Each vertical on the left has to be split into Network Elements that map onto horizontals on the right

  3. NGN Concept Service / Application Layer Application Layer NGN IMS Transport Layer Access Layer PLMN PSTN Circuit to Packet migration is first step in mapping of PSTN to NGN

  4. NGN – ITU Perspective • Next Generation Network (NGN) provides a framework for network evolution, as defined by the ITU-T (Rec. Y.2001) • Key Characteristics • Packet-based network [generally Internet Protocol or IP] • Independence of service-related functions from underlying transport technologies • Interworking with legacy networks via open interfaces • Generalized mobility • Unrestricted access by users to different services and/or service providers

  5. ETSI NGN Vision • Mobile/Fixed Convergence, based on the “IMS” platform • A multi-service, multi-protocol, multi-access,IP based network - secure, reliable and trusted • Multi-services: delivered bya common QoS enabled core network. • Multi-access: diverse connectivity networks;fixed and mobile terminals, (Mobile, xDSL, etc) • Not one network, but different networksthat interoperate seamlessly • Mobility of both users and devices • “My communications services” • anywhere, any terminal >>> all of this leads to a true Next Generation Network

  6. The Vendor’s Perspective •Mobile: Motorola, NEC, Nokia, Samsung •Fixed: Cisco, Italtel, Sonus, Tekelec, Veraz •Mobile/Fixed: Alcatel, Ericsson, Siemens, Huawei, UTStarcom •Fixed/Mobile: Lucent, Nortel •Mobile/Fixed and Mobile are leaders in Session Management •Fixed and Fixed/Mobile are leading with MGCF

  7. PSTN to NGN MigrationBSNL Perspective

  8. PSTN to NGN PSTN Switch NGN Components Call Server / Soft Switch Call Control Switching Routers of IP/MPLS Network Interfaces Gateways SG / TMG / LAG TDM Transport Network Common IP MPLS Transport

  9. Softswitch STPNetwork Signaling Gateway Announcement Server Trunk Media Gateway IP MPLS Core Network PSTN Switch Step- 1: IP TAX – Class 4 NGN

  10. GENERIC REFERENCE DIAGRAM FOR ‘IP BASED TAX’ NMS Sigtran / SCTP Sigtran / SCTP Softswitch (MGC) Softswitch (MGC) SIP-T SG 1,2 SG 1,2 Q.1912.5 SS7 SS7 ANNOUNCEMENT SERVER ANNOUNCEMENT SERVER H.248 STP Function STP Function NTP SERVER CORE IP BACKBONENETWORK H.248 SS7 SS7 PSTN PSTN Bearer Channels Bearer Channels MG MG IP/RTP

  11. Scope of IP TAX Project • Setting up Two Soft Switches at New Delhi and Chennai and Signalling Gateways at New Delhi, Chennai, Kolkotta and Bangalore • Providing Trunk Media Gateways (TMGs) at 21 Level-1 locations • Providing one Announcement Servers in each IP domain • Billing interface to Centralized Billing Server • NMS

  12. IP TAX Components • Soft Switch (or Call Agent or Telephony Server or Media Gateway Controller) • Based upon Open Architecture • Should preferably be developed on Commercially Available Hardware and Software Platforms • Should be able to provide all existing services available in TDM network • Performs Media Gateway Control Function • Performs Call control, signalling and interworking,Traffic measurement and recording functions • Provides Addressing, Analysis, routing and charging facilities • Interacts with Application Server to supply services not hosted on Softswitch

  13. IP TAX Components • Signalling Gateway • Provides interworking function between SS7 network and IP network • This involves providing various types of User Adaptations so that the SS7 signalling can be terminated in SGW and can be translated and messages transported over IP Network • Performs Packetization of signalling and ensures its transport through IP network

  14. IP TAX Components • Trunk Media Gateway • Performs the functions of • Voice encoding & Compression • Packetization of voice channels • CNF (Comfort Noise Generation) • VAD (Voice Activity Detection) • Echo Cancellation • May provide the edge functionality and act as CE

  15. NMS Soft switch (MGC) AS EMS SG New Delhi 0 PT - 8 AM - 4 MG RJ - 4 MG AG - 4 MG MG LW - 4 MG MG JLN - 4 MG KOL - 16 ND -40 MG GU - 4 BSNL’s MPLS Core MG Existing STP N/w MG MG JPR - 4 MG RPR - 4 AHM - 8 MG MG MG HYD - 8 BPL - 4 MG MG MG CHN - 16 MG CBT - 4 MBI - 40 MG MG NGP – 4 BG - 12 ENK - 4 CK - 4 Chennai Soft switch (MGC) AS EMS SG

  16. Future IP TAX Requirement

  17. Softswitch Application Servers STPNetwork Signaling Gateway Announcement / Media Server Trunk Media Gateway IP MPLS Core Network Other VoIP Network Session Border Controller PSTN Switch Line / Access Gateway Customer Network Access Network Step 2: IP TAX and Access in NGN

  18. Class 5 Components • Application Server (or Feature Server) • Provides service logic and execution of user (or customer) services that are not directly hosted on Softswitch • Due to open architecture and standards it can be a third party product

  19. Class 5 Components • Session Border Controller (SBC) • Deployed at edge (IP-IP network border as between service provider and customer / enterprise network) and core (IP-IP network border as between two service providers) of service provider’s network to control signaling and media streams as they enter / exit the network • Provides security, denial of service attacks, overload control, Network Address Translation and Firewall Traversal, Lawful Interception, QoS management, Protocol Translation, call accounting

  20. Class 5 Components • Access Gateway • Performs the functions of • Media conversion • Codec Negotiation • Termination of line side interfaces like phones, devices and PBXs • Echo Cancellation • VAD (Voice Activity Detection and Comfort Noise Generation) • Providing edge functionality and act as CE router

  21. RSU Next Generation Switching Architecture Application Server Soft switch SBC Line Access Gateway PRI Access Gateway SHDSL V5.2 Common IP MPLS Transport 2B+D ADSL/ADSL2+ AN TMG E1s Local / Rural Exchanges SSTP Network

  22. NGN Definition • ITU-T definition for NGN: • A Next Generation Network (NGN) is a packet-based network able to provide services including Telecommunication Services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users

  23. Step 3: Fully Converged Architecture IMS Architecture

  24. Network Function Role Origin Call Session Control Function (CSCF) Handles registration of end points, routing of SIP signaling messages SIP Proxy Servers, Developed from scratch Home Subscriber Server (HSS) One-stop database for user information HLR from mobile network Media Gateway Control Function (MGCF) Softswitch Media Gateway Control Softswitch Application Server (AS) Provide service logic for applications Feature Servers, Feature sets from Softswitches Policy Decision Function (PDF) Provides QoS Existing Policy Managers, from scratch IMS Key Components

  25. Migration Path to IMS

  26. THANK YOU

  27. NGN Class 5 Features • Mobility: It should be possible for users to register dynamically their current location so that they can be contacted when mobile using a publicized address • Forking: It should be possible to associate multiple devices with a single address, so that all or a selection of these devices can be contacted simultaneously or in succession • Features Negotiation: It should be possible for the users to negotiate media and protocol extensions to be used for a particular call for setting up any type of media conversation, including voice, video and messaging

  28. NGN Class 5 Features • Applications Flexibility: It should be possible to define, create and implement new applications in the network. The new applications may be built up on separate Application Servers which may be located in the same network / domain or in some other network / domain. The addition of new applications will normally not require changes in any of the devices, other than hosts, in the transport network • Combinational services: It should be possible to combine different services into one service e.g., instant messaging and voice

  29. Soft Switch Small step Yields IP cost advantages Easily supports current PSTN services Makes use of Intelligent Network (IN) services IMS Big step Yields IP cost advantages Does not as easily support current PSTN services Does not use IN Platform for non PSTN services Achieves fixed & mobile core network convergence. Comparison

  30. Circuit Switching (CAS) Transit Local Exchange Local Exchange Call Control Call Control Call Control Switching Signaling & Bearer Switching Signaling & Bearer Switching Interfaces Interfaces Interfaces Bearer is a voice channel

  31. Circuit Switching (CCS) Transit Local Exchange Local Exchange Call Control Call Control Call Control Switching Bearer Switching Bearer Switching Interfaces Interfaces Interfaces Call Control Switching Signaling Signaling Interfaces STP

  32. Circuit Switching (CCS) Transit Local Exchange Local Exchange Call Control Call Control Call Control Switching Bearer Switching Bearer Switching Interfaces Interfaces Interfaces Signaling Signaling Signaling Transfer

  33. Circuit Switching (CCS) Transit Local Exchange Local Exchange Call Control Call Control Call Control Bearer Bearer Transfer Switching Bearer Switching Interfaces Interfaces Signaling Signaling Signaling Transfer

  34. Soft Switching Transit Architecture Transit Local Exchange Local Exchange Soft switch Call Control Call Control Gateway Gateway Bearer Switching Switching Bearer Common IP MPLS Transport Interfaces Interfaces Signaling Gateway Gateway Signaling

  35. Next Generation Switching Transit Local Exchange Soft switch Call Control Gateway Gateway Bearer Switching Common IP MPLS Transport Interfaces Gateway Signaling

  36. When 3G and MPLS core are available Transit Option-I Local Exchange GSM Network 3G Call Control Bearer Switching Interfaces Signaling Common IP MPLS Transport

  37. When 3G and MPLS core are available Transit Option-II (Preferred Solution) Local Exchange Soft switch GSM Network 3G Call Control TMG Bearer Switching Common IP MPLS Transport Interfaces SGW Signaling

  38. IMS Architecture

  39. Overview of NMS Site - Chennai NMS Local Terminals AS LAN SW PLMN SSW FE FE Billing System PSTN TMG Gig-E SGW E1/STM-1 FE MPLS Edge STP PSTN/PLMN Gig-E

  40. Overview of Soft Switch Site - New Delhi Remote NMS Terminals AS LAN SW PLMN SSW FE FE PSTN TMG SGW Gig-E E1/STM-1 FE MPLS Edge STP PSTN/PLMN Gig-E

  41. Overview of SGW Site – Bangalore & Kolkatta Remote NMS Terminals LAN SW PLMN PSTN TMG SGW Gig-E E1/STM-1 FE MPLS Edge STP PSTN/PLMN Gig-E

  42. Overview of Other 16 Level-I Sites Remote NMS Terminals LAN SW PLMN PSTN TMG Gig-E E1/STM-1 MPLS Edge Gig-E

  43. EOI

  44. EOI for NGN Project • The TAX requirement for next two years is about 6.5 million circuits • Tender for deployment of 200 KC IP TAX is under evaluation • EOI is being floated for inviting bidders to get their equipment validated • Successful bidders in EOI will become eligible to participate in the future requirement of 6.5 million DS0s

  45. EOI for NGN Project • The EOI is for both IP TAX(Class 4) and Access Network (Class 5) • The EOI envisages validation for three types of Configurations viz.,: •  a) Configuration 1.0 (IP-TAX) • b) Configuration 2.0 (Access Network) • c) Configuration 3.0 (Application Services) • Validation Certificates are proposed to be issued for each configuration

  46. Equipment for Configuration 1.0

  47. Equipment for Configuration 2.0

  48. Equipment for Configuration 3.0

  49. Services Requested • Caller ID related services (CLIP, CLIR, ...) • Call waiting, Call holding, Push to talk • Call forwarding, Call transfer • Follow me service • Call blocking services, Malicious Caller Identification • Click to Dial • Musical Ring Back • Lawful interception • Announcement services • Conference call services • Voicemail, Text-to-speech, Speech-to-text • SMS, MMS • IP Centrex • Calling Card • Pay Phone • Carrier Selection • Presence information, Instant messaging

  50. Additional Features in Configuration 3.0 • Offered services shall have the following features: • Mobility: It should be possible for users to register dynamically their current location so that they can be contacted when mobile using a publicized address • Forking: It should be possible to associate multiple devices with a single address, so that all or a selection of these devices can be contacted simultaneously or in succession • Features Negotiation: It should be possible for the users to negotiate media and protocol extensions to be used for a particular call for setting up any type of media conversation, including voice, video and messaging

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