It’s up to you! When a visitor arrives we can notify the contact they choose by sending an email, SMS, or Slack message. We even offer the ability for you to prioritize each message. For example, you can setup rules such that an email is sent to the contact immediately, but if they don't respond to their visitor in 15 seconds a text message is sent.
You can even set up what we call “back up notifications” to other employees in case the contact is in a meeting or out of the office and can not respond.