FreeSWITCH – solving communication problems

FreeSWITCH is an open source telephony platform designed to facilitate the creation of voice and chat driven products scaling from a soft-phone up to a soft-switch. It can be used as a simple switching engine, a media gateway or a media server to host IVR applications using simple scripts or XML to control the callflow.

The software supports various communication technologies such as SIP, H.323, IAX2 and GoogleTalk making it easy to interface with other open source PBX systems such as sipX, OpenPBX, Bayonne, YATE or Asterisk.

FreeSWITCH also support both wide and narrow band codecs making it a solution to bridge legacy devices to the future. The voice channels and the conference bridge module all can operate at 8, 16 or 32 kilohertz and can bridge channels of different rates.

It is capable of being embedded into other projects, as well as being used as a stand-alone application.

Features include:

  • Centralized User/Domain Directory (directory.xml).
  • Nano Second CDR granularity.
  • Call recording (In Stereo caller/callee left/right).
  • High Performance Multi-Threaded Core engine.
  • Configuration via CURL to your http server (xml_curl).
  • XML Config files for easy parsing.
  • Protocol Agnostic.
  • Configurable RFC2833 Payload type.
  • Inband DTMF generation and detection.
  • Software based Conference (no hardware requirement).
  • Wideband Conferencing.
  • Media / No Media modes.
  • Proper ENUM/ISN dialing built in.
  • Detailed CDR in XML.
  • Radius CDR.
  • Subscription server:
    • Shared Line Appearances.
    • Bridged Line Appearances.
  • Enterprise/Carrier grade Eventing Engine. (XML Events, Name Value Events, Multicast Events).
  • Loadable File formats and streaming.
  • Stream to Shoutcast.
  • Multi-lingual Speech Phrase Interface.
  • ASR/TTS support (native and via MRCP).
  • Basic IP/PBX features.
  • Automated Attendant.
  • Custom Ring Back Tones.
  • XML RPC support.
  • Multiple format CDR’s supported.
  • SQL Engine provides session persistence.
  • Thread Isolation.
  • Parallel Hunting.
  • Serial Hunting.
  • Support:
    • Paid support available.
    • Free support via IRC & e-mail.
  • Many supported codecs:
    • CELT (32kHz ahd 48kHz).
    • G.722.1 (wideband).
    • G.722.1C (wideband 32kHz).
    • G.722 (wideband).
    • G.711.
    • G.726 (16k,24k,32k,48k) AAL2 and RFC3551.
    • G.723.1 (passthru).
    • G.729 (passthru).
    • AMR (passthru).
    • iLBC.
    • speex (narrow and wideband).
    • lpc10.
    • DVI4 (ADPCM) 8khz and 16khz.

Website: freeswitch.com
Support: Documentation
Developer: Anthony Minessale and contributors
License: Mozilla Public License

FreeSWITCH is written in C. Learn C with our recommended free books and free tutorials.

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