Telecommunications Voice over IP (VoIP) 3

Question 1

What is the purpose of a jitter buffer in VoIP?

Accepted Answer

Store packets temporarily to reduce delivery variation

Answer

Amplify voice signals

Answer

Encrypt voice streams

Answer

Prioritize video over voice

Question 2

Which QoS mechanism marks VoIP packets for priority treatment?

Accepted Answer

DSCP

Answer

NAT

Answer

VLAN tagging only

Answer

STP

Question 3

What does MOS stand for in VoIP quality assessment?

Accepted Answer

Mean Opinion Score

Answer

Media Over Session

Answer

Maximum Output Signal

Answer

Modulated Optical Sampling

Question 4

What is a SIP trunk?

Accepted Answer

A virtual connection linking a PBX to a carrier's SIP network

Answer

A physical cable connecting PBX systems

Answer

A type of analog phone line

Answer

A software codec for G.711

Question 5

What protocol is used for delivering voicemail notifications to IP phones?

Accepted Answer

NOTIFY via SIP

Answer

RTP

Answer

RTCP

Answer

SIMPLE

Question 6

What type of address uniquely identifies a SIP endpoint?

Accepted Answer

SIP URI

Answer

MAC address

Answer

DSCP value

Answer

E.164 number only