An open-source scanner that identifies SIP devices and PBX servers on a target network. It can be helpful for system administrators when used as a network inventory tool.

• A. Svmap
• B. VoIP
• C. rwho
• D. rusers

Answer: (A)

Svmap is a specialized open-source VoIP scanner designed to discover SIP devices and PBX servers on a target network. It focuses on identifying VoIP endpoints like IP phones and PBX appliances by probing for SIP services and related fingerprints, often gathering details such as IP address, device type, and vendor information. This makes it a useful network inventory tool for system administrators, helping them map out the VoIP infrastructure, plan updates, and manage assets.

The other options don’t fit this use case: VoIP by itself isn’t a scanning tool, and rwho and rusers are commands for querying remote users on systems rather than discovering SIP devices.