Your customers get an incoming call that plays your pre-recorded audio message. Voice messages drive high levels of trust among recipients, especially when you’re communicating time-sensitive or confidential information.
To listen to the greeting: Call the attendant during business hours—OR in the attendant's display pane: Click the Edit button next to Greeting (the Edit Auto-Attendant Greeting dialog box appears), then the Play button next to Current Greeting at the top of the Create New tab.; NOTE: If using the Firefox browser, then—to get your Windows Media Player to operate correctly:

According to its website, Ngrok is a way to “expose local servers behind NATs and firewalls to the public internet over secure tunnels” which is how we connect the Pi server to Twilio services in two steps after downloading and installing Ngrok on the Pi.
A secretary in a doctor’s office creates a voicemail greeting that says, “If you have a scheduled meeting with us, we could use copies of all your medical documents from last year, so come prepared.” Using the word “could” gives patients the impression that they don’t necessarily “need” last year’s documents. See the difference between “could” and “need”? Your word choice can impact a future meeting significantly. If you want a customer to perform a specific action, you need to pay close attention to how you express your calls-to-action.