What is the default CoS value for Voice signaling packets in VoIP?

What is the default CoS value for Voice signaling packets in VoIP?

• A. 3
• B. 0
• C. 2
• D. 5

Answer: (A)

VoIP traffic is split into voice signaling and the actual voice media, and signaling needs timely delivery to set up and manage calls without delaying the call. It sits above best-effort traffic but not at the very top, so it gets a high, but not the highest, priority. The default CoS value used for this signaling traffic is 3, which places it in a high-priority class without monopolizing bandwidth. The highest priority (CoS 5) is typically reserved for the actual voice payload, while signaling benefits from being prioritized but remains distinct from the media stream. Hence, signaling uses CoS 3.

VoIP traffic is split into voice signaling and the actual voice media, and signaling needs timely delivery to set up and manage calls without delaying the call. It sits above best-effort traffic but not at the very top, so it gets a high, but not the highest, priority. The default CoS value used for this signaling traffic is 3, which places it in a high-priority class without monopolizing bandwidth. The highest priority (CoS 5) is typically reserved for the actual voice payload, while signaling benefits from being prioritized but remains distinct from the media stream. Hence, signaling uses CoS 3.