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• an Open Source software development project

• written in the C Programming Language  

• running on Linux (or other types of Unix )

• powering Business Telephone Systems  

• connecting many different Telephony protocols

• a toolkit for building many things: 

  • an IP PBX with many powerful features and applications
  • VoIP Gateways
  • Conferencing systems
  • and much, much more

• supporting VoIP Phones as well as PSTN and POTS  

• speaking SIP , the most common VoIP protocol, among others

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