What hardware components are essential for an IPO installation?

The essential hardware components for an IPO installation include IPO servers, gateways, and supported telephones because these elements are crucial for the operational functionality of the IPO (IP Office) platform.

IPO servers serve as the primary processing units that handle all telephony and communication tasks. They manage the voice and data traffic, execute system functions, and store configuration settings. Without a dedicated server, the IPO system would lack the backbone necessary for operation.

Gateways are equally vital as they facilitate communication between the IPO system and external networks, including traditional phone lines and VoIP services. They play a key role in ensuring that calls can be made to and received from external parties, thereby expanding the reach and functionality of the IPO system.

Finally, supported telephones are needed to provide users with the means to communicate through the IPO system. These can include desk phones, softphones, and other endpoints that are compatible with the IPO environment.

Considering these components work together to create a fully functioning telecommunication system, they are indispensable for a successful IPO installation. The other options, while they may be useful in certain contexts, do not encapsulate the necessary hardware for an effective IPO setup.