exports.handler = function(context, event, callback) {
  context.getTwilioClient().messages.create({
    to: process.env.TO,
    from: process.env.FROM,
    body: `${event.RecordingDuration}s call from ${event.From} (${event.FromCity}, ${event.FromState} ${event.FromZip})`
  }).then(msg => {
    callback(null, msg.sid)
  }).catch(err => callback(err))
}