What does "twinning" refer to in VoIP systems?

• A. Connecting multiple phones to a single network
• B. Linking multiple devices to a single account for simultaneous ringing
• C. Combining audio and video streams into one transmission
• D. Creating a backup of VoIP account settings

Answer: (B)

Twinning in VoIP systems specifically refers to linking multiple devices to a single account so that they can ring simultaneously when a call comes in. This functionality is particularly useful for users who may have both a desk phone and a mobile phone or a softphone application, ensuring that they do not miss calls regardless of which device they are using at the moment. By setting up twinning, the VoIP system can send the call to both devices, allowing the user the flexibility to answer the call on either device. This enhances communication efficiency, especially in environments where being reachable is critical.