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External caller transferred to an extension that would just ring a pager and hang up.
We have a phone line displayed outside of our shop that a truck driver can call from their cell phone. The idea would be that the driver enters an IVR menu and is promted to press 1 (helps avoid spam too.) After pressing 1 a loud speaker such as the Algo 8180 inside the shop will ring once or play 1 audio file and the caller would then be sent to a message and the call is then disconnected.
Sometimes our shop is noisy and the regular ringer on the phone in there isn't loud enoubh.