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drachtio-client 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 ) ) ;
      }) ;