would be nice if createXXX generated dialoginfo events

[davehorton]

It would make integration with the Dialog Event Package quite easy if srf.createB2BUA (and createUAS and createUAC) somehow generated events corresponding to the dialog state machine.

An application that wanted to send NOTIFY's to subscribed devices could then just hook into these events.

[davehorton]

this feature was added in 4.4.44. The various srf.createXXX functions now now take an opts.dialogStateEmitter argument which, as its name suggests, should be an EventEmitter. If provided, that object will emit a 'stateChange' event with an object containing properties.

class StateEmitter extends Emitter {
  constructor() {
    super();
  }

  this.on('stateChange', (evt) => {  
    const {id, localTag, remoteTag, aor, direction, state, callId} = evt;
  }
}

..

const emitter = new StateEmitter();
srf.invite((req, res) => {
  srf.createB2BUA(req, res, uri, {
    dialogStateEmitter: emitter,
    ..
  }
});