What item from the Equipment Inventory is used for communication with the Tactical Session Controller?

The VoIP Desk Phone is utilized for communication with the Tactical Session Controller, primarily because it allows for clear, reliable voice communication which is essential during tactical sessions. VoIP technology facilitates effective and instant communication over the internet, making it a suitable choice for coordinating operations and relaying critical information among team members.

The USB Headset, while useful for audio input and output, is typically an accessory for personal computers or devices and does not directly serve as a standalone communication tool with the Tactical Session Controller. A Grounding Strap is designed for electrical safety purposes and does not relate to communication functions. The CAT5e Cable is a networking cable that connects devices within a network but does not in itself provide communication capabilities; it supports connection but requires an actual communication device. Thus, the VoIP Desk Phone stands out as the correct choice for facilitating direct communication with the Tactical Session Controller.