Kamailio :: A Quick Introduction
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Kamailio is the leading Open Source SIP Server - a SIP proxy, registrar, location server, presence server, IMS server and much more. Find out more by viewing this quick presentation! (Updated June 2014)
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Kamailio :: A Quick Introduction
- 1. A QUICK INTRODUCTION TO KAMAILIO Olle E. Johansson * oej@edvina.net * Twitter oej Copyright Edvina AB, Sollentuna, Sweden 2013-205 .All rights reserved.V4.2
- 2. FIRST: What is a proxy compared with a PBX?
- 3. A SIP PBX You Me PBX Everyone talks with the PBX! This is called a SIP b2bua
- 4. A SIP PROXY You Me SIP We ļ¬nd each other usingāØ the proxy. Multimedia Communication is peer2peer Media
- 5. FINDINGYOU You Me SIP DNS is used, like e-mail. DNS sip:alice@example.com
- 6. THE PROXY ANDTHE PBX WORKS WELLTOGETHER. You Me PBX SIP Services like IVR Conference
- 7. THE PROXY HAS MANY ROLES SIP SIP SIP SIP Proxy Outbound proxy Location server/registrar Presence server Call routing (LCR) SIP Application server SIP
- 8. WHAT DOESNāT IT DO? GW HOLD CONF REC GatewayāØ to other protocols Mix calls in a conference Put calls on hold RecordāØ calls Listen to DTMF IVR Handle media RTP
- 10. KAMAILIO Open Source SIP Server Presence server SIP Proxy Application server A lot of activity! WebSocket SIP server
- 11. THE KAMAILIO PROJECT ā¢ Project leader:āØ Daniel Constatin Mierla (Asipto) ā¢ Management board with community members ā¢ Many developers, active community ā¢ Renamed to Kamailio in 2008 ā¢ Merged with the original āØ Sip Express Router for version 3 in 2008 kamailio.org
- 12. KAMAILIOTECHNOLOGY ā¢ Written in ANSI C and optimized for speed ! ! ā¢ Modular design ! ! ā¢ Flexible conļ¬guration and routing language ! ! ā¢ Supports MySQL, PostgreSQL, LDAP, RADIUS, Sqlite , radius, UnixODBC! ! ā¢ Standard (RFC3261) compliant ! ā¢ Web based administration interface: SIREMIS! ! ā¢ Management port (TCP, UDP, XML)! ! ā¢ Embedded HTTP server for Xcap (Presence)! ! ā¢ Python, Perl, LUA development interfaces! ! ā¢ NAT traversal capable ! ! ā¢ Portable, runs on POSIX compliant systems
- 13. KAMAILIO PHILOSOPHY ā¢ Over 100 modules - build anything! ā¢ Many modules overlap ā¢ Especially in carrier-business-related stuff, like least cost routing ā¢ As long as we have maintainers, weāre ļ¬ne with that.
- 14. KAMAILIO EVOLUTION From http://sip-router.org/wiki/history/ser-9-years Notice āØ That we merged!
- 15. KAMAILIO DEVELOPMENT MODEL ā¢ Development base code is named āSIP-routerā! ! ā¢ Licensed under GPL. Contributions may be under BSD.! ! ā¢ Currently about 20 developers ! ! ā¢ Anyone can freely contribute extensions and modules ! ! ā¢ Changes to existing modules are subject to approval SIP-router.org Kamailo releases SER releases Tekelec products
- 16. WHERETO GET IT? Linux packagesāØ http://www.kamailio.org/wiki/ packages/rpms FreeBSD/OpenBSDāØ Ports Source codeāØ www.kamailio.org Just download and run!
- 17. KAMAILIO FUNCTIONALITY ā¢ It is a SIP server originally designed as a SIP proxy ā¢ Can be conļ¬gured as an ā¢ SIP Outbound Proxy ā¢ Location server/registrar ā¢ Presence server ā¢ Application server ā¢ ā¦and much more ā¢ Development API for SIP servlets and UserAgent functionality ā¢ LUA, Java, Python module integration for advanced functionality ā¢ Runs on many operating systems SIP proxy PresenceāØ server SIP applicationāØ server SIP loadāØ balancer SIP Session Border Controller
- 18. ADDITIONAL FEATURES ā¢ IPv4-IPv6 gateway ā¢ UDP/TCP/SCTP/WS translator ā¢ NAT traversal support ā¢ anti-DOS functions (pike, blacklists) ā¢ Gateway to SMS, XMPP (Jabber) ā¢ Accounting ā¢ Interface to LUA, Python, Mono/C# and Perl ā¢ Database support MongoDB, Redis, Radius, MySQL, PostgreSQL, UnixODBC, Berkeley DB and Oracle ā¢ ...much more IPv4/IPv6āØ UDP/TCP/SCTP/WSāØ TLS NAT ! Languages: Java, Python, Lua, Perl, Mono, C# ! Databases: Mysql PostgreSQL UnixODBC Berkeley DB OracleāØ Redis, MongoDBāØ Cassandra
- 19. A MODULAR ARCHITECTURE SIP Server core Modules Modules Modules Modules MySQL Radius TM NATāØ Support Core provides Transport managements Memory management Module interface Shared memory Locking Conļ¬guration Modules provide Script functions Module parameters Special variables Management functions
- 20. ADDITIONAL HELPERS KAMCTL KAMDBCTL KAMCMD SIREMIS Management interface (MI) functions Start/stop Shared variables Statistics Database installation helper ! RPC Interface and MI functions Statistics Select/Conļ¬g variables (Arrived from SER) ! Web application Statistics Database management Separate project !
- 21. KAMAILIO ISTHE HEART OFYOUR SIP NETWORK Kamailio RTP relay PSTNāØ gw DB AdmināØ (WEB) Feature server 3rd āØ party IM/SMSāØ gw Internal network Public network Users
- 22. MULTIPROCESS, NOTTHREADS UDP listen TCP listen TCP/TLS listen STCP listen Other worker processes
- 23. MANAGEMENT RPC interface XMLrpc Json Pipe MIāØ (deprecated) KAMCMD KAMCTL Unix command line applications
- 24. MEMORY HANDLING PKG - Kamailio memory manager Unix memory manager Shared memoryāØ (core) Per process memory 4 MB per process64 MB per Kamailio Allocated at start. Transactions SIP message Shared variables Script variables
- 25. ABOUT KEEPING STATE: ā¢ Kamailio keeps transaction, user and location data in shared memory (RAM) at runtime ā¢ Some of this can be cached to database, but in-memory is the default ā¢ This statelessness delivers scalability and resilience in the network Stateless forwardingāØ and responses Transaction states Dialog - ācallā - states
- 26. GENERAL ADVICE: ā¢ Try to keep proxy processing as simple as possible ā¢ Be very careful on where you add states ā¢ In larger networks, separate ā¢ Ingress/Egress proxys (Session Border Controllers) ā¢ Registrar/location server ā¢ Core proxy ā¢ Feature proxy Compare withāØ IP routers!
- 27. CONFIGURATION
- 28. KAMAILIO IS ATOOLBOX ā¢ Kamailio is not a ready-made application like Asterisk or FreeSwitch ā¢ There is a very powerful conļ¬guration language where you conļ¬gure handling of individual SIP Messages ā¢ You need understanding of the SIP protocol to build your application Load balancer SBC Trunk server PBX
- 29. $avp(rtype) if($rm == āINVITEā) {} route(āNATā); t_relay(); THE KAMAILIO SCRIPTS ā¢ C-like language ā¢ IF/THEN,WHILE constructs ā¢ Variables with different scopes (global, local, transactions) ā¢ Hash tables, database integration, memcached and much more ā¢ Loading a new module extends functionality, like in Asterisk or Apache
- 30. ? WHEREāSTHE DIAL PLAN? ā¢ Kamailio routes SIP messages, not calls ā¢ There are many ways to route calls (consisting of at least an INVITE and a BYE message) ā¢ There is a module called āDIALPLANā that can simplify building a pbx-like call routing engine ā¢ Remember, Kamailio does not handle media. Companion products like RTPengine, RTPproxy, Asterisk and FreeSwitch handles media. ??
- 32. SMALL CARRIER SIP KamailioāØ Session BorderāØ controller SIP KamailioāØ Core proxy SIP Kamailio Registrar/Location server Asterisk PSTN Gateway Asterisk Voicemail Server Asterisk Feature/IVR Server
- 33. UNIVERSITY IPTRANSITION .com Session BorderāØ controllerāØ (commercial product) SIP KamailioāØ Core proxy Asterisk PBX Asterisk Old PBX Media gateway ISDN
- 35. MULTI-FEATURE SERVICE SIP Asterisk IVR, Queues, prompts SIP Audio Video Chat Presence Telephony Core KamailioāØ proxys
- 37. KAMAILIO 4 COMES WITH SIP OVER WEBSOCKETS WWWyou Me SIP WS sip/websockets sip/tcp JavascriptāØ app Media over SRTP
- 38. KAMAILIO AND ASTERISK WITH SIP OVER WEBSOCKETS WWWyou Me SIP WS sip/websockets JavascriptāØ SIP app Media over SRTP AST RTP
- 39. JSSIP: OPEN SOURCE SIPSTACK IN JAVASCRIPT ā¢ Available for download at jssip.net ā¢ Written by the authors of IETF RFC 7118 on SIP over websockets ā¢ Reference implementation ā¢ MIT license
- 40. COMPONENTS NEEDED ā¢ SIP over WS servers: Kamailio, OverSIP, Asterisk, FreeSwitch ā¢ Audio media server RTP gateway: Asterisk, FreeSwitch, RTPengine ā¢ SIP/Javascript: SIPml5, JSSIP
- 41. EDVINATRAINING CLASSES ā¢ Kamailio from start ā¢ The SIP Protocol ā¢ RTP, RTCP and QoS ā¢ SIP Security ā¢ Scalability ā¢ Many Kamailio labs CUSTOMāØ INHOUSEāØ TRAININGS ā¢ SIP,Asterisk, Kamailio and much more ā¢ Done at your site, customized for your project ā¢ Cost effective when more than four students Find more details at http://edvina.net ā¢ Advanced Kamailio ā¢ SIP trunking ā¢ NAT handling ā¢ WebRTC/SIP ā¢ Testing, debugging ā¢ Scalability ā¢ Many Kamailio labs
- 42. THATāS ALL FOLKS. Twitter @kamailioproject ! Like us on Facebook too! Download on www.kamailio.org