Business Phone Systems VoIP Fundamentals 1 — Questions and Answers
Question 1: What does VoIP stand for?
- Voice over Internet Protocol (Correct answer)
- Virtual Office IP
- Video over Internet Protocol
- Voice of Interactive Platform
Correct answer: Voice over Internet Protocol
VoIP stands for Voice over Internet Protocol, the technology that transmits voice calls over the internet.
Question 2: Which protocol is most commonly used for signaling in VoIP systems?
- SIP (Correct answer)
- FTP
- SMTP
- HTTP
Correct answer: SIP
SIP (Session Initiation Protocol) is the most widely used signaling protocol for establishing and terminating VoIP calls.
Question 3: What is a codec in the context of VoIP?
- A device that compresses and decompresses audio data (Correct answer)
- A type of network switch
- A firewall rule for voice traffic
- A billing software module
Correct answer: A device that compresses and decompresses audio data
A codec compresses and decompresses audio data to reduce bandwidth usage while maintaining call quality.
Question 4: What quality issue occurs when VoIP packets arrive out of order?
- Jitter (Correct answer)
- Latency
- Packet loss
- Echo
Correct answer: Jitter
Jitter refers to the variation in packet arrival times, which can cause choppy or distorted audio in VoIP calls.
Question 5: Which port does SIP typically use for unencrypted signaling?
- 5060 (Correct answer)
- 443
- 80
- 3306
Correct answer: 5060
SIP uses port 5060 for unencrypted communications and port 5061 for TLS-encrypted signaling.
Question 6: What is the recommended maximum one-way latency for acceptable VoIP call quality?
- 150 ms (Correct answer)
- 500 ms
- 1000 ms
- 50 ms
Correct answer: 150 ms
ITU-T G.114 recommends a maximum one-way latency of 150 ms for acceptable VoIP call quality.
Business Phone Systems VoIP Fundamentals 1
What does VoIP stand for?