Telecommunications Voice over IP (VoIP)

Question 1

What protocol is most commonly used to initiate and terminate VoIP calls?

Accepted Answer

SIP

Answer

RTP

Answer

H.323

Answer

MGCP

Question 2

What protocol carries the actual voice media in a VoIP call?

Accepted Answer

RTP

Answer

SIP

Answer

TCP

Answer

SCTP

Question 3

What is jitter in VoIP communications?

Accepted Answer

Variation in packet arrival times

Answer

Packet loss percentage

Answer

Total one-way delay

Answer

Echo on the voice line

Question 4

Which codec is known for narrowband voice quality at 64 kbps?

Accepted Answer

G.711

Answer

G.729

Answer

G.722

Answer

Opus

Question 5

What is the recommended maximum one-way latency for acceptable VoIP call quality?

Accepted Answer

150 ms

Answer

50 ms

Answer

300 ms

Answer

500 ms

Question 6

What does a SIP proxy server do?

Accepted Answer

Route SIP requests between endpoints

Answer

Convert analog to digital signals

Answer

Encode voice into packets

Answer

Provide DHCP for VoIP phones