VoIP Fundamentals Flashcards
6 cards from real Business Phone Systems practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 VoIP Fundamentals flashcards as text
What is QoS in the context of VoIP networks?
Answer: Quality of Service — prioritizing voice traffic over other data
QoS (Quality of Service) prioritizes VoIP packets on the network to ensure low latency and minimal packet loss.
What is the MOS (Mean Opinion Score) scale used for?
Answer: Rating perceived voice call quality from 1 to 5
MOS rates perceived audio quality on a scale of 1 (bad) to 5 (excellent), with 4+ considered toll quality.
Which DSCP value is recommended for marking VoIP media traffic to ensure QoS?
Answer: EF (Expedited Forwarding, DSCP 46)
EF (Expedited Forwarding) with DSCP value 46 is the standard marking for real-time voice media to receive highest priority.
What is a softphone?
Answer: A software application that enables VoIP calls from a computer or mobile device
A softphone is a software program installed on a computer or smartphone that provides full phone functionality over VoIP.
What is the purpose of a STUN server in VoIP?
Answer: Helps VoIP devices discover their public IP address and NAT type
A STUN server allows VoIP clients behind NAT to discover their public IP address and port for direct media communication.
Which transport protocol do most VoIP systems prefer for carrying RTP media?
Answer: UDP
UDP is preferred for RTP media because its low overhead suits real-time audio better than TCP's retransmission delays.