XML Based Service Provisioning in Converged Voice and Data Networks

Inhaltsverzeichnis (Table of Contents)

• Preface
• List of Abbreviations
• Table of Contents
• 1 Introduction
• 2 Fundamentals
  • 2.1 Extensible Markup Language (XML)
    • 2.1.1 XML Overview
    • 2.1.2 XML Specifications
      • 2.1.2.1 Document Type Definition (DTD)
      • 2.1.2.2 Well-Formed XML Documents
      • 2.1.2.3 Valid XML documents
    • 2.1.3 How XML works
    • 2.1.4 SGML
    • 2.1.5 HTML
    • 2.1.6 XML vs. HTML
  • 2.2 Session Initiation Protocol (SIP)
    • 2.2.1 SIP Characteristics
    • 2.2.2 SIP Basics
    • 2.2.3 SIP Addresses
    • 2.2.4 SIP Messages
    • 2.2.5 SIP Operation
  • 2.3 Intelligent Networks (IN)
    • 2.3.1 IN Architecture
    • 2.3.2 Benefits of Intelligent Networks
    • 2.3.3 IN Services
• 3 Call Processing Language (CPL)
  • 3.1 Language Specifications
    • 3.1.1 Top Level Actions
    • 3.1.2 Switches
    • 3.1.3 Location Modifiers
    • 3.1.4 Signaling Actions
    • 3.1.5 Non-signaling actions
    • 3.1.6 Subactions
  • 3.2 Examples
    • 3.2.1 Example 1: Simple call forwarding
    • 3.2.2 Example 2: A more complicated example
  • 3.3 Extensibility
• 4 Architecture
  • 4.1 SIP User
  • 4.2 SIP Server
  • 4.3 Location Database
  • 4.4 CPL Engine
    • 4.4.1 Design
    • 4.4.2 Flow diagram
    • 4.4.3 Tag Classes
  • 4.5 CPL Repository
    • 4.5.1 Flat File vs. Database
      • 4.5.1.1 Flat File
      • 4.5.1.2 Database
    • 4.5.2 Active vs. Passive Repository
  • 4.6 CPL User Editor
  • 4.7 The relations of the components
• 5 Tools used in the project
  • 5.1 XML Parser
    • 5.1.1 Document Object Model (DOM)
    • 5.1.2 Simple API for XML (SAX)
    • 5.1.3 DOM vs. SAX
  • 5.2 Common Object Request Broker Architecture (CORBA)
    • 5.2.1 History of Distributed Systems
    • 5.2.2 Alternatives of CORBA
      • 5.2.2.1 Socket Programming
      • 5.2.2.2 Remote Procedure Call (RPC)
      • 5.2.2.3 OSF Distributed Computing Environment (DCE)
      • 5.2.2.4 Microsoft Distributed Component Object Model (DCOM)
      • 5.2.2.5 Java Remote Method Invocation (RMI)
    • 5.2.3 Advantages of CORBA
    • 5.2.4 The TAO CORBA
    • 5.2.5 The Naming Service
    • 5.2.6 The Event Service
  • 5.3 Lightweight Directory Access Protocol (LDAP)
• 6 Implementation
  • 6.1 SIP Server
  • 6.2 CPL Engine
    • 6.2.1 General overview
    • 6.2.2 CORBA Interface
    • 6.2.3 Classes
  • 6.3 CPL Repository
  • 6.4 CPL User Editor

Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)

This master thesis investigates the design, implementation, and evaluation of creating additional services for Internet Telephony using the Extensible Markup Language (XML) as the data definition format. The main goal is to use the Call Processing Language (CPL) to create intelligent services for Internet Telephony, providing features such as call forwarding, redirection, and e-mail notifications.

• The development of a Call Processing Language (CPL) to provide intelligent services for Internet Telephony.
• The application of Extensible Markup Language (XML) as a foundation for creating these services.
• The integration of Session Initiation Protocol (SIP) as the signaling protocol for Internet Telephony.
• The comparison of the proposed system with current Intelligent Network (IN) solutions used in traditional telephony.
• The evaluation of the ease of implementation and user-friendliness of the CPL environment.

Zusammenfassung der Kapitel (Chapter Summaries)

• Chapter 2: Fundamentals: This chapter introduces the essential concepts of Extensible Markup Language (XML) and Session Initiation Protocol (SIP), highlighting their importance in Internet Telephony. It also discusses the Intelligent Networks (IN) used in traditional telephony as a reference point for comparison with the proposed system.
• Chapter 3: Call Processing Language (CPL): This chapter presents a detailed explanation of the Call Processing Language (CPL), which utilizes XML to define and control Internet Telephony services. It covers language specifications, including tags for different actions, switches, location modifiers, and signaling actions. Two examples illustrate the use of CPL for simple and complex call forwarding scenarios.
• Chapter 4: Architecture: This chapter outlines the architecture of the system, consisting of six main components: SIP User Agent, SIP Server, Location Database, CPL Engine, CPL Repository, and CPL User Editor. It focuses on the design and implementation details of the CPL Engine and CPL Repository, highlighting their crucial role in the system.
• Chapter 5: Tools used in the project: This chapter discusses the tools used in the project, particularly the XML parser and CORBA (Common Object Request Broker Architecture), which are essential for parsing CPL scripts and establishing communication between the CPL Engine and SIP Server. Additionally, a brief explanation of LDAP (Lightweight Directory Access Protocol) is provided.
• Chapter 6: Implementation: This chapter provides information about the implementation of each component in the system, including modifications made to the existing SIP Server and the detailed implementation of the CPL Engine, CPL Repository, and CPL User Editor.

Schlüsselwörter (Keywords)

This thesis explores the application of XML-based service provisioning, specifically using the Call Processing Language (CPL) for Internet Telephony. The main focus is on creating and evaluating intelligent services for end users. This includes aspects like call forwarding, redirection, and integration with other communication channels. The project utilizes Session Initiation Protocol (SIP) as the signaling protocol, and the architecture relies on CORBA (Common Object Request Broker Architecture) for communication between components.

Frequently Asked Questions

What is the role of XML in this Internet Telephony project?

XML serves as the data definition format for creating additional services like call forwarding and redirection.

What is Call Processing Language (CPL)?

CPL is a language based on XML used to define and control intelligent services within Internet Telephony environments.

Why are IP networks replacing traditional circuit-switched networks?

IP networks are cheaper, allow integration of voice, data, and video, and offer open implementation for end systems.

What protocol is used for signaling in this system?

The system utilizes the Session Initiation Protocol (SIP) as the primary signaling protocol.

What is the function of the CPL Engine?

The CPL Engine parses the XML-based scripts and executes the defined logic for call processing and service delivery.