Final answer:
An IVR (Interactive Voice Response) system is what a company phone directory that reads to callers and allows them to enter extensions is called. The system uses pre-recorded voice prompts to enable customers to navigate the company's phone system efficiently.
Step-by-step explanation:
A company phone directory that is read to callers and allows them to enter an extension for transfer is an example of a Interactive Voice Response (IVR) system. IVR systems are designed to facilitate interaction with callers through pre-recorded voice prompts and menus which direct the user to various parts of a phone system, including the option to input extension numbers for a direct connection to a department or individual within a company. The use of IVR systems can significantly improve customer service efficiency and effectiveness, as it enables callers to navigate a company's phone system without the need for a receptionist or operator to direct the call.