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Welcome to the drachtio media resource function, empowering nodejs/javascript developers to build rich media application on SIP / VoIP networks.

drachtio is an open-source, nodejs-based ecosystem for creating any kind of VoIP server-based application: registrar, proxy, back-to-back user agent, and many others. Within the drachtio ecosystem, drachtio-fsmrf is a high-level media processing abstraction layer that utilizes freeswitch as a media server, and partners with the drachtio signaling resource framework to enable the creation of media-processing applications such as conferencing, IVR and others.

Note: API documentation for drachtio-fsmrf can be found here.

var app = require('drachtio')() ;
var Mrf = require('drachtio-fsmrf') ;
var mrf = new Mrf(app) ;
var Srf = require('drachtio-srf') ;
var srf = new Srf(app) ;
  host: '',
  port: 9022,
  secret: 'cymru',
.on('connect', (err, hostport) => { console.log(`connected to drachtio listening on ${hostport}`) ;})
.on('error', (err) => { console.error(`Error connecting to drachtio at ${err || err.message}`) ; }) ;
mrf.connect( {
  address: '',
  port: 8021,
  secret: 'ClueCon'
}, (ms) => {
  console.log(`connected to media server `);
  // save the media server object as in app locals so it can be retrieved from middleware = ms ;
}) ;
srf.invite( (req, res) => {
  // connect caller to an endpoint on the media server, res, {
    codecs: ['PCMU']
  }, (err, ep, dialog) => {
    if( err ) { throw err ; }
    // set up dialog handlers 
    dialog.on('destroy', () => { ep.destroy() ; }) ;
    // play some prompts['ivr/8000/ivr-please_reenter_your_pin.wav',
      'ivr/8000/ivr-you_lose.wav'], function(err, results){
        console.log(`results: ${JSON.stringify(results)}`) ;
      }) ;
  }) ; 
}) ;

Getting Started

Note: drachtio-fsmrf applications require a network connection to a drachtio server process that sits in the VoIP network and handles the low-level SIP messaging.

Additionally, drachtio-fsmrf applications require a freeswitch media server, configured as defined in the drachtio-fs-ansible, which provides an ansible role that can be used build up a freeswitch media server for use with drachtio-fsrmf from a vanilla ubuntu install.

Install drachtio-fsmrf

npm install drachtio-fsmrf --save

Create an instance of the media resource function

First, create a drachtio "app". This contains the middleware stack and core message routing functions needed for the core drachtio library that is central to all drachtio applications. Next, create a new instance of the drachtio media resource function, passing the drachtio app that you just created.

var drachtio = require('drachtio') ;
var app = drachtio();
var Mrf = require('drachtio-fsmrf'); 
var mrf = new Mrf(app) ;

Create an instance of the signaling resource framework

In most cases, you will also want to create an instance of the drachtio signaling resource framework as well, in order to handle the SIP signaling requirements of the application.

var Srf = require('drachtio-srf'); 
var srf = new Srf(app) ;

Connect to one or more freeswitch media servers

In order to create and manipulate endpoints, conferences and other resources, you must first obtain a reference to an instance of a MediaServer. This is done by the 'mrf.connect' method:

  address: '',  // IP address freeswitch event socket is listening on 
  port: 8021,           // freeswitch event socket listen port 
  secret: 'ClueCon',    // freeswitch authentication secret 
  listenPort: 8085      // leave at 8085; unless freeswitch dial plan is changed 
}, function(ms) {
  console.log('connected to mediaserver: ', JSON.stringify(ms)) ;

Allocate and manipulate resources on a media server

Once you have obtained a reference to a media server, you can obtain access to resources on the media server via any of the following methods:

You can also send freeswitch api commands directly to the media server by invoking the MediaServer#api method.

Once you are done working with an endpoint, you should call Endpoint#destroy to release it back to the media server.

IVR Features

Once you have an endpoint, and a connected SIP dialog, you can create IVR interactions by calling methods on the endpoint:

Conferencing Features

There are two ways to create a conference:

  1. By calling MediaServer#createConference which creates a named conference on the media server
  2. By allocating an endpoint, and then calling Endpoint#joinConference, to which you can either pass a previously allocated conference object, or simply the name of a conference. In the latter case, a conference is dynamically created on the media server.

Sample applications

Besides the example applications found in the examples folder, the following full-fledged sample applications are available: