Phone Service Business VoIP Technology & Protocols 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 on Internal Phone
Correct answer: Voice over Internet Protocol
VoIP stands for Voice over Internet Protocol, the technology for delivering voice communications over IP networks.
Question 2: Which protocol is most commonly used for initiating and terminating VoIP calls?
- RTP
- SIP (Correct answer)
- H.323
- MGCP
Correct answer: SIP
SIP (Session Initiation Protocol) is the most widely used signaling protocol for setting up, managing, and terminating VoIP sessions.
Question 3: What protocol is used to actually transport the audio data during a VoIP call?
- SIP
- RTP (Correct answer)
- DNS
- HTTPS
Correct answer: RTP
RTP (Real-time Transport Protocol) carries the actual voice media packets during an active VoIP call.
Question 4: What is jitter in the context of VoIP quality?
- Background noise from HVAC systems
- Variation in packet arrival times that causes choppy audio (Correct answer)
- A type of VoIP codec
- Call dropping due to bandwidth limits
Correct answer: Variation in packet arrival times that causes choppy audio
Jitter is the inconsistency in packet arrival times, which causes audio distortion or choppiness in VoIP calls.
Question 5: Which VoIP codec is known for providing high-definition voice quality and is commonly supported by modern business phones?
- G.711
- G.729
- G.722 (Correct answer)
- iLBC
Correct answer: G.722
G.722 is a wideband codec that delivers HD voice quality by using a higher sampling rate than standard narrowband codecs.
Question 6: What is a SIP trunk used for in business telephony?
- Storing voicemail messages
- Connecting a business PBX to the public telephone network via the internet (Correct answer)
- Managing internal extensions only
- Routing emails to phone extensions
Correct answer: Connecting a business PBX to the public telephone network via the internet
A SIP trunk is a virtual phone line that connects a business PBX to the PSTN (Public Switched Telephone Network) using VoIP.
Phone Service Business VoIP Technology & Protocols 1
What does VoIP stand for?