[Broken_Hippo]

I'd think it would be more involved: They have an answering system that recognizes the caller ID. The IVR is set up to have an automated announcement report that the store doesn't sell alcohol or even that they are closed, and then produces a special ringtone, if the call goes through at all.

They claim it is to circumvent fraud (folks ordering pizza and not paying) and bad payments and the like as a cover. And it isn't just a local pizza place: This is a nationwide chain doing such actions.

Edit: Addtionally, employees would be trained to avoid such situations.