What type of handsets does a communications company using TIA/EIA IS-95 require?

The correct answer is CDMA, as the TIA/EIA IS-95 standard, also known as cdmaOne, is specifically designed for Code Division Multiple Access (CDMA) technology. This standard outlines the protocols for mobile telecommunications and utilizes spread-spectrum technology that allows multiple communication signals to occupy a single transmission channel effectively.

In environments where IS-95 is implemented, mobile handsets must be compatible with CDMA to communicate effectively within the network. This specialization allows for better use of bandwidth and more efficient communication than earlier technologies.

Other options are associated with different technologies: GSM (Global System for Mobile Communications) is a time division-based system that is not compatible with IS-95; TDMA (Time Division Multiple Access) is another alternative that operates under different principles from CDMA; and VoIP (Voice over Internet Protocol) pertains to transmitting voice communications over the internet rather than using cellular technologies. Consequently, they do not align with the requirements of a communications company utilizing the IS-95 standard.