What does RPS in provisioning do for factory default IP phones?

The correct answer is that RPS (Remote Provisioning Service) guides factory default IP phones to request a provisioning file from a specific URL. When an IP phone is powered on and it is configured to use RPS, it first connects to the RPS server, which then provides it with the URL of the provisioning server where it can download its configuration file. This is essential for ensuring that the phone is set up according to the desired settings for its operation, such as SIP credentials, network settings, and any other configurations necessary for it to function properly within a VoIP environment.

This process simplifies the deployment of IP phones in bulk, as it minimizes the need for manual configuration by end-users or onsite IT personnel. It provides a convenient and streamlined method to get new devices up and running quickly, ensuring they are correctly configured before use.

The other options do not accurately describe the function of RPS. The service does not instruct users to call customer service, does not automatically set up phones without any user interaction beyond the initial connection, and does not update phone software directly; rather, it facilitates the retrieval of necessary configuration files which may include software update prompts based on the provisioning setup.