SerialPort X is a scripting addition that allows access to an internal modem or standard serial ports from AppleScript. Includes AppleScript examples and an Address Book plug-in to dial phone numbers via the internal modem.
Rewritten as a scriptable application, because as of Mac OS 10.14 (Mojave) Apple is no longer allowing 3rd party scripting additions. Same functionality as the v 2.2 scripting addition.