web.rb

post '/answer' do
  user = params[:user]
  if user == "voicemail"
    notifier.ping "Call from: " + $redis.hget("call:#{params[:callId]}","from") + ". Hotline off.",
      attachments: [call_details]
  end
end

post '/hangup' do
  hangupCause = "#{params[:cause]}"
  if hangupCause == "cancel"
    notifier.ping "Missed call from: " + $redis.hget("call:#{params[:callId]}","from") + ". Hotline on.",
      attachments: [call_details]
  end
  $redis.del("call:#{params[:callId]}")
end