Business Phone Systems VoIP Fundamentals 3

Question 1

What is QoS in the context of VoIP networks?

Accepted Answer

Quality of Service — prioritizing voice traffic over other data

Answer

Quality of Sound codec standard

Answer

Quantity of Sessions protocol

Answer

Queue of Services feature

Question 2

What is the MOS (Mean Opinion Score) scale used for?

Accepted Answer

Rating perceived voice call quality from 1 to 5

Answer

Measuring network uptime percentage

Answer

Counting simultaneous VoIP calls

Answer

Scoring SIP registration failures

Question 3

Which DSCP value is recommended for marking VoIP media traffic to ensure QoS?

Accepted Answer

EF (Expedited Forwarding, DSCP 46)

Answer

AF41 (DSCP 34)

Answer

CS3 (DSCP 24)

Answer

BE (DSCP 0)

Question 4

What is a softphone?

Accepted Answer

A software application that enables VoIP calls from a computer or mobile device

Answer

A phone with a flexible silicone casing

Answer

A cloud-based voicemail system

Answer

An analog phone adapter

Question 5

What is the purpose of a STUN server in VoIP?

Accepted Answer

Helps VoIP devices discover their public IP address and NAT type

Answer

Stores voicemail messages

Answer

Routes SIP registration requests

Answer

Provides DHCP addresses to IP phones

Question 6

Which transport protocol do most VoIP systems prefer for carrying RTP media?

Accepted Answer

UDP

Answer

TCP

Answer

SCTP

Answer

HTTP