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Building Telephony Systems with OpenSER Table of Contents

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Building Telephony Systems with OpenSER Table of Contents
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Table of Contents

Preface
Chapter 1: Introduction to SIP
Chapter 2: The SIP Express Router
Chapter 3: OpenSER Installation
Chapter 4: OpenSER Standard Configuration
Chapter 5: Adding Authentication with MySQL
Chapter 6: Building the User Portal with SerMyAdmin
Chapter 7: Connectivity to the PSTN
Chapter 8: Call Forward and Voice Mail
Chapter 9: SIP NAT Traversal
Chapter 10: OpenSER Accounting and Billing
Chapter 11: Troubleshooting Tools
After Words
Index
  • Chapter 1: Introduction to SIP
    • SIP Basics
      • SIP Proxy in the Context of a VOIP Provider
      • SIP Operation Theory
      • SIP Registration Process
    • Server Operating as a SIP Proxy
    • Server Operating as a SIP Redirect
    • Basic Messages
      • SIP Dialog Flow
    • SIP Transactions and Dialogs
      • The RTP Protocol
        • Codecs
        • DTMF-Relay
        • Real Time Control Protocol (RTCP)
      • Session Description Protocol (SDP)
    • The SIP Protocol and the OSI Model
    • The VoIP Provider "Big Picture"
      • SIP Proxy
      • User, Administration, and Provisioning Portal
      • PSTN Gateway
      • Media Server
      • Media Proxy or RTP Proxy for Nat Traversal
      • RADIUS Accounting
      • CDRTool Rating
      • Monitoring Tools
  • Where You Can Find More Information
  • Summary
    • Chapter 2: The SIP Express Router
      • Where Are We?
      • What is the SIP Express Router?
      • What Software to Use, SER or OpenSER?
      • Usage Scenarios
      • OpenSER Architecture
        • Core and Modules
        • Sections of the File openser.cfg
        • Sessions, Dialogs, and Transactions
        • openser.cfg Message Processing
      • SIP Proxy—Expected Behavior
      • Stateful Operation
      • Differences between Strict Routing and Loose Routing
      • Understanding SIP and RTP
        • Summary
      • Chapter 3: OpenSER Installation
        • Hardware Requirements
        • Software Requirements
        • Lab—Installing Linux for OpenSER
        • Downloading and Installing OpenSER v1.2
        • Lab—Running OpenSER at the Linux Boot
        • OpenSER v1.2 Directory Structure
          • Configuration Files (etc/openser)
          • Modules (/lib/openser/modules)
          • Binaries (/sbin)
        • Log Files
        • Startup Options
        • Summary
        • Chapter 4: OpenSER Standard Configuration
          • Where Are We?
          • Analyzing the Standard Configuration
          • Using the Standard Configuration
          • Routing Basics
            • Transactions and Dialogs
            • Initial and Sequential Requests
            • Routing in a Context of a Transaction
            • Routing in the Context of a Dialog
            • Lab—Tracking a Complete Dialog
            • Lab—Running Stateless
            • Lab—Disabling record-route
          • Summary
          • Chapter 5: Adding Authentication with MySQL
            • Where Are We?
            • The AUTH_DB Module
            • The REGISTER Authentication Sequence
              • Register Sequence (Packets Captured by ngrep)
              • Register Sequence Code Snippet
              • The INVITE Authentication Sequence
                • INVITE Sequence Packet Capture
              • Digest Authentication
                • WWW-Authenticate Response Header
                • The Authorization Request Header
                • QOP—Quality of Protection
              • Installing MySQL Support
              • openser.cfg File Analysis
            • The Openserctl Shell Script
              • Openserctl Resource File
                • Openserctlrc File
              • Using OpenSER with Authentication
              • Enhancing the Script
                • Managing Multiple Domains
                • Alternative Routes
            • The Functions check_to() and check_from()
            • Using Aliases
            • Handling CANCEL requests and retransmissions
            • Full Script with All the Resources Above
            • Lab—Enhancing the Security
            • Lab—Using Aliases
            • Summary
              • Chapter 7: Connectivity to the PSTN
                • Where Are We?
                  • Requests Sent to the Gateway
                  • Requests Coming From the Gateway
                  • openser.cfg Inspection
                • Lab—Using Asterisk as a PSTN Gateway
                  • Asterisk Gateway (sip.conf)
                  • Cisco 2601 Gateway
                • Using LCR (Least Cost Routes)
                  • The LCR Module
                    • Configuration Diagram
                  • VoIP Provider Dial Plan
                  • The LCR Table
                  • The Gateways Table
                    • The Gateway Groups Table
                  • Adding, Removing, and Showing LCR and Gateways
                  • Openserctl LCR-Related Commands.
                    • Notes:
                    • Examples:
                  • Lab—Using the LCR Feature
                    • lcr Gateway Groups
                    • lcr Gateways
                    • lcr Routes
                • Securing re-INVITES
                • Blacklists and "473/Filtered Destination" messages
                • Summary
                • Chapter 8: Call Forward and Voice Mail
                  • Call Forwarding
                    • Pseudo-Variables
                    • AVP (Attribute-Value Pair) Overview
                      • AVPOPS Module Loading and Parameters
                    • Implementing Blind Call Forwarding
                      • Lab—Implementing Blind Call Forwarding
                    • Implementing Call Forward on Busy or Unanswered
                  • Inspecting the Configuration File
                  • Lab—Testing the Call Forward Feature
                    • Summary
                  • Chapter 9: SIP NAT Traversal
                    • NAT Types
                      • Full Cone
                      • Restricted Cone
                      • Port Restricted Cone
                      • Symmetric
                      • NAT Firewall Table
                    • Solving the SIP NAT Traversal Challenge
                      • Implementing a Far-End NAT Solution
                        • RFC3581 and the force_rport() Function
                        • Solving the Traversal of RTP Packets
                    • Handling REGISTER Requests behind NAT
                      • Determining if the Client is behind NAT
                  • Handling INVITE Messages behind NAT
                  • Handling the Responses
                  • MediaProxy Installation and Configuration
                    • Installing MediaProxy
                  • openser.cfg Analysis
                    • Modules Loading
                    • Modules' Parameters
                    • Register Message Processing
                    • Invite Message Processing
                    • BYE and CANCEL Message Processing
                    • RE-INVITE Message Handling
                    • Reply Message Handling
                    • Routing Script
                  • Invite Diagram
                    • Packet Sequence
                  • Lab Using MediaProxy for NAT Traversal
                    • Implementing a Near-End NAT Solution
                      • Why STUN Does Not Work with Symmetric NAT Devices
                      • Comparing STUN with TURN (Media Relay Server)
                      • ALG—Application Layer Gateways
                      • ICE (Interactive Connection Establishment)
                    • Summary
                    • Chapter 10: OpenSER Accounting and Billing
                      • Objectives
                      • Where Are We?
                        • VoIP Provider Architecture
                        • Accounting Configuration
                        • LAB—Accounting using MySQL
                        • openser.cfg Analysis
                        • Accounting using RADIUS
                      • Installation of FreeRADIUS and CDRTool
                        • Packages and Dependencies
                        • Create and Configure the Database for the Radius server
                        • Configuration of the FreeRADIUS Server
                        • Configure the RADIUS Client (radiusclient-ng)
                        • Configure OpenSER
                        • Test the Configuration after Making a Call
                      • Using CDRTool for Rating
                        • LAB—CDRTool Installation
                        • LAB—Using CDRTool
                      • CDRTool Architecture
                      • How CDRTool Rates a Call
                        • Lab—Creating and Applying a Rating Plan
                      • Summary
                      • Chapter 11: Troubleshooting Tools
                        • Objectives
                        • Built-in Tools
                        • Packet Capture and Trace Tools
                          • TShark, Wireshark
                          • SipTrace
                          • Stress Testing Tools
                            • Sipsak
                            • SIPp
                            • Installing SIPp
                            • Stress Test—The SIP Signaling
                            • Stress Test—The RTP Signaling
                            • Testing MediaProxy
                          • Monitoring Tools
                        • Summary
                        • After Words
                          • What's New in Version 1.2.3
                            • Cancel Handling
                            • Blacklist is Disabled by Default
                            • Method Filtering
                            • Alias_DB
                            • Branch_route
                          • Migration from 1.2.2 to 1.2.3 and 1.3.1
                          • Migrating the Script from Chapter 10 to openser 1.3.1
                          • RTPProxy
                            • Lab—Installing RTPProxy
                          • Areas for Further Investigation
                            • Carrier Route
                            • Dialog
                            • SIP Session Timers
                          • SIP Peering
                          • TLS Transport Layer Security
                          • Development
                            • PERL
                            • WeSIP
                          • Common Mistakes
                            • Daemon Does Not Start
                            • Client Unable to Register
                            • Sending a Call to a Provider with Authentication
                            • Typos in the Configuration File
                            • The Last Tip
                          • Forum and Training
                          • Summary
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