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building telephony systems opensips

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Table of Contents Preface Chapter 1: Introduction to SIP Chapter 2: Introduction to OpenSIPS Chapter 3: OpenSIPS Installation Chapter 4: Script and Routing Basics Chapter 5: Adding Authentication with MySQL Chapter 6: Graphical User Interfaces for OpenSIPS Chapter 7: Connectivity to the PSTN Chapter 8: Media Services Integration Chapter 9: SIP NAT Traversal Chapter 10: OpenSIPS Accounting and Billing Chapter 11: Monitoring Tools Index Preface Up Chapter 1: Introduction to SIP SIP basics SIP operation theory SIP registering 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 VoIP provider, the big picture SIP proxy User administration and provisioning portal PSTN gateway Media server Media Proxy or RTP Proxy for NAT traversal Accounting and CDR generation Monitoring tools Where you can find more information Summary Up Chapter 2: Introduction to OpenSIPS Where we are What is OpenSIPS? OpenSIPS history Main characteristics Speed Flexibility OpenSIPS is extendable Portability Small footprint Usage scenarios OpenSIPS configuration file Core and modules Sections of the opensips.cfg file Sessions, dialogs, and transactions Message processing in the opensips.cfg SIP proxy—expected behavior Stateful operation Summary Up Chapter 3: OpenSIPS Installation Hardware requirements Software requirements Lab—installing Linux for OpenSIPS Downloading and installing OpenSIPS v1.6.x OpenSIPS console Lab—running OpenSIPS at the Linux boot OpenSIPS v1.6.x directory structure Configuration files (etc/opensips) Modules (/lib/opensips/modules) Binaries (/sbin) Log files Redirecting OpenSIPS log files Startup options Summary Up Chapter 4: Script and Routing Basics Where we are Scripting OpenSIPS Global parameters Listen interfaces Logging Number of processes Daemon options SIP identity Miscellaneous Standard script for global parameters Modules and their parameters Standard configuration for modules and parameters Scripting basics Core functions Core values Core keywords Pseudo-variables Script variables Attribute-Value Pair (AVP) overview Flags The module GFLAGS Statements if-else Switch Subroutes Routing basics Routing requests and replies Initial and sequential requests Sample route script Using the standard configuration Common issues Daemon does not start Client unable to register Too many connections Summary Up Chapter 5: Adding Authentication with MySQL Where we are The AUTH_DB module The REGISTER authentication sequence Register sequence Register sequence code snippet The INVITE authentication sequence INVITE sequence packet capture INVITE code snippet Digest authentication WWW-Authenticate response header The Authorization request header QOP—Quality Of Protection Plaintext or hashed passwords Installing MySQL support Analysis of the opensips.cfg file Register requests Non-Register requests The opensipsctl shell script The resource file—opensipsctlrc The opensipsctlrc file Using OpenSIPS with authentication Enhancing the script Managing multiple domains Using aliases Handling CANCEL request and retransmissions Full script with all the resources above Lab—multi-domain support Lab—using aliases Summary Up Chapter 6: Graphical User Interfaces for OpenSIPS OpenSIPS Control Panel Installation of opensips-cp Installing Monit Configuring OpenSIPS Control Panel SerMyAdmin Lab—installing SerMyAdmin SerMyAdmin configuration Basic tasks Registering a new user Approving a new user User management Domain management Interface customization Comparing OpenSIPS-CP and SerMyAdmin Summary Up Chapter 7: Connectivity to the PSTN The big picture Requests sent to the gateway The GROUP module Requests coming from the gateways The module permissions Example Inspection of the opensips.cfg file Using Asterisk as a PSTN gateway Asterisk gateway (sip.conf) Cisco 2601 gateway Dynamic routing Most relevant parameters Sort order Blacklist Force_dns Drouting tables Case study for dynamic routing DIALPLAN transformations DIALPLAN example Inspection of the file opensips.cfg Blacklists and "473/Filtered Destination" messages Summary Up Chapter 8: Media Services Integration Playing announcements Example: playing demo-thanks Voicemail How to integrate Asterisk Real Time with OpenSIPS Call forwarding Implementing blind call forwarding AVPOPS module loading and parameters Lab—implementing blind call forwarding Implementing call forward on busy or unanswered Inspecting the configuration file Lab—testing the call forward feature Summary Up Chapter 9: SIP NAT Traversal Why NAT breaks SIP Where NAT breaks SIP NAT types Full cone Restricted cone Port restricted cone Symmetric Why symmetric NAT is hard to traverse NAT firewall table Solving the SIP NAT traversal challenge Implementing a near-end NAT solution Why STUN does not work with symmetric NAT devices Implementing a far-end NAT solution The RFC3581 and the force_rport() function Solving the traversal of the RTP packets RTP Proxy installation and configuration Analysis of the file opensips.cfg Modules loading Modules parameters Determining if the client is behind NAT Handling REGISTER requests behind NAT Handling INVITE messages behind NAT Handling the responses Handling RE-INVITE messages Routing script Invite diagram Packet sequence Lab—using the RTP Proxy for NAT traversal Comparing STUN with TURN (MRS) Application layer gateways (ALGs) Interactive Connectivity Establishment (ICE) Summary Up Chapter 10: OpenSIPS Accounting and Billing Objectives Where we are VoIP provider architecture Accounting configuration Automatic accounting Multi-leg accounting Lab—accounting using MySQL Analysis of the opensips.cfg file Generating the CDRs Lab—generating Call Detail Records Accounting using RADIUS Lab—accounting using a FreeRADIUS server Package and dependencies FreeRADIUS client and server configuration Configure OpenSIPS server Solving the problem with missing BYEs Account in the gateway instead of the proxy Use SIP session timers Use RTP proxy timeout Use Media Proxy timeout Prepaid and postpaid billing Summary Up Chapter 11: Monitoring Tools Where we are Built-in tools Trace tools SIPTRACE Configuring the SIPTRACE Stress testing tools SIPSAK SIPp Installing SIPp Stress test—the SIP signaling Stress test—the RTP signaling Wireshark Monitoring tools Summary Up Index

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building telephony systems opensips