VoIP protocols, QoS, and unified communications concepts tested on Network+.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What does SIP stand for in VoIP?
- Session Initiation Protocol
- What protocol does SIP use to establish call sessions?
- SIP uses request-response transactions over UDP or TCP
- What default port does SIP use?
- Port 5060 for SIP signaling (5061 for SIP over TLS)
- What does RTP stand for?
- Real-Time Transport Protocol
- What is the primary function of RTP in VoIP?
- RTP carries the actual voice data and provides timestamps and sequence numbers for packet delivery
- What does RTCP stand for?
- Real-Time Transport Control Protocol
- What is the purpose of RTCP in a VoIP call?
- RTCP provides feedback on the quality and delivery statistics of RTP streams
- What is a voice codec?
- Software or hardware that compresses and decompresses voice signals for VoIP transmission
- Name a commonly used VoIP codec and its bit rate.
- G.711 uses 64 Kbps, or G.729 uses 8 Kbps
- What does QoS stand for in networking?
- Quality of Service
- Why is QoS critical for VoIP deployments?
- VoIP is sensitive to latency, jitter, and packet loss; QoS prioritizes voice traffic to maintain call quality
- What is latency in the context of VoIP?
- The delay between when voice is spoken and when it is heard on the other end
- What is the recommended maximum one-way latency for VoIP?
- 150 milliseconds
- What is jitter in VoIP?
- Variation in the delay of packet arrival, causing voice to sound choppy or distorted
- What is packet loss in VoIP and how does it affect calls?
- When voice packets do not reach the destination; causes audio dropouts and decreased intelligibility