Origin of freeswitch
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Origin of FreeSWITCH. Asterisk Developer Meeting (March, 2005) 5 days of coding (initial design of the core) 7 months of discussion. 3 months prep work in private. Open to the public January 1st 2006. 7 months of coding in the public eye. Design Fundamentals. Build a stable core.

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Origin of FreeSWITCH

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Origin of freeswitch

Origin of FreeSWITCH

  • Asterisk Developer Meeting (March, 2005)

  • 5 days of coding (initial design of the core)

  • 7 months of discussion.

  • 3 months prep work in private.

  • Open to the public January 1st 2006.

  • 7 months of coding in the public eye.


Design fundamentals

Design Fundamentals

  • Build a stable core.

  • Build up complexity in layers.

  • Leverage existing open source software.

  • Use of modular architecture to increase flexibility.


Standard features

Standard Features

  • APR: Memory Pools, Thread safe Queues, Hash Tables and Overall Abstraction.

  • SQLite: built-in SQL database.

  • TeleTone: Tone generation and detction.

  • Libresample: live audio resampling.

  • SRTP: Secure RTP.


Event sysyem

Event Sysyem

  • Philosophy

  • Core Events

  • Custom Events

  • Event Handlers


Logger system

Logger System

  • Concept

  • Logger Interface


Origin of freeswitch

XML

  • Reasoning

  • freeswitch.xml meta-document

  • XML hook interface


Loadable module interface

Loadable Module Interface

  • Overview

  • Endpoints

  • Codecs

  • Dialplans

  • Timers

  • Applications

  • API Interface

  • File Formats

  • Speech Interface

  • Directory Interface


State machine

State Machine

  • Overview

  • Session Thread and Conditional Mutex

  • State Hooks

  • Read/Write Locks

  • States: CS_NEW | CS_INIT | CS_RING | CS_TRANSMIT | CS_EXECUTE | CS_LOOPBACK | CS_HOLD | CS_HANGUP | CS_DONE


Crash protection

Crash Protection

  • ./configure –enable-crash-protection

  • Explanation

  • Differences on various OS


Modules

Modules


Enpoint modules

Enpoint Modules

  • mod_woomera(Woomera)

  • mod_wanpipe(Sangoma Cards)

  • mod_dingaling(Jingle/GoogleTalk)

  • mod_portaudio(Sound Card)

  • mod_exosip, mod_sipX mod_pjsip (SIP)

  • mod_iax (IAX2)


Dialplan modules

Dialplan Modules

  • mod_dialplan_xml(XML)

  • mod_dialplan_directory(LDAP)


Application modules

Application Modules

  • mod_dptools(misc applications)

  • mod_commands(remote commands)

  • mod_conference(conference bridge)

  • mod_bridgecall(bridge)

  • mod_echo(loopback test)

  • mod_playback(stream audio)

  • mod_rss(RSS news reader)

  • mod_skel(reference)


Language modules

Language Modules

  • mod_spidermonkey(javascript)

  • mod_perl(perl)

  • mod_mono ***(.NET C#)


Codec modules

Codec Modules

  • mod_g711(G711 ulaw/alaw)

  • mod_ilbc(iLBC)

  • mod_gsm(GSM)

  • mod_l16(Signed Linear)

  • mod_speex(Speex)


Event handler modules

Event Handler Modules

  • mod_cdr(Call Detail Log)

  • mod_event_multicast(Multicast UDP)

  • mod_xmpp_event(XMPP)

  • mod_zeroconf(Zeroconf)

  • mod_event_socket(Remote Client)


Logger modules

Logger Modules

  • mod_syslog(UNIX Syslog)

  • mod_console(Console Logger)


File formats timers xml asr tts

File Formats / Timers / XML / ASR TTS

  • mod_sndfile(Audio file formats)

  • mod_softtimer(Software Timer)

  • mod_xmlrpc(XML-RPC interface)

  • mod_cepstral(Text-To-Speech)


Questions

Questions


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