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    0.1.4 • Public • Published Build Status NPM version

    drachtio logo is an application framework that is designed to let node.js developers easily integrate Voice-over-IP (VoIP) features into their applications using familiar middleware patterns.

    The architecture consists of the following components:

    • drachtio-server - A high-performance, resilient SIP user agent that can be controlled by one or more client applications over a TCP network connection. The drachtio-server is written in C++ and is based on the open source sofia sip stack that is used in Freeswitch
    • drachtio-client - Low-level javascript library that provides abstraction for SIP request and response processing.
    • drachtio-connect - Higher-level framework designed to offer familiar middleware patterns to web application developers, enabling them to easily incorporate VoIP features into their applications.


    drachtio-client is a low-level framework that is intended to be used in conjunction with drachtio-connect middleware. This document describes the drachtio-client feature set and API, but the reader is encouraged to review the drachtio-connect library as well. Generally speaking, a developer will interact with the framework through the higher-level drachtio-connect middleware framework rather than directly through drachtio-client, although it is important to know how to create a client and to be familiar with the basic API and objects provided by this library. lets you build all sorts of SIP applications: SIP proxies, user agent clients and servers, back-to-back user agents, registrars, and more.

    Here is an example showing how to create a simple SIP proxy server:

    //require the drachtio client-side agent, and create an instance of it
    var Agent = require('drachtio-client').Agent ;
    var agent = new Agent(handler) ;
    //connect to a drachtio server
      host: 'localhost',
      port: 9022,
      secret: 'cymru'
    }) ;
    //tell agent which messages we want to receive
    agent.route('invite') ;
    agent.route('bye') ;
    //now handle incoming messages
    function handler(req,res) {
      if( req.msg.method === 'INVITE') {
            type: 'stateful',
            destination: '',
            headers: {
              'User-Agent': 'drachtio rockx!'
          }, function(err, results){
            if( err ) return console.error( 'Error attempting to proxy: ', err ) ;
            console.log('results: ', JSON.stringify( results ) ) ;
          }) ;




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