Conference Call Conference Call Technology & Tools 1 — Questions and Answers
Question 1: Which protocol is most commonly used to transmit voice data over the internet in conference calls?
- VoIP (Correct answer)
- FTP
- SMTP
- HTTP
Correct answer: VoIP
VoIP (Voice over Internet Protocol) converts audio into data packets transmitted over the internet for conference calls.
Question 2: What does the acronym PSTN stand for in the context of conference calling?
- Public Switched Telephone Network (Correct answer)
- Private Secure Transmission Node
- Protocol System Transfer Network
- Public Signal Transfer Node
Correct answer: Public Switched Telephone Network
PSTN stands for Public Switched Telephone Network, the traditional landline phone infrastructure used for dial-in conferencing.
Question 3: What is a conference bridge in telephony?
- A device or service that connects multiple callers into a single call (Correct answer)
- A physical bridge between two office buildings
- A software for scheduling meetings
- A type of noise-canceling hardware
Correct answer: A device or service that connects multiple callers into a single call
A conference bridge is a device or cloud service that merges multiple incoming phone lines into a single shared audio session.
Question 4: Which audio codec is widely considered high-definition (HD) quality in modern conference call platforms?
- Opus (Correct answer)
- G.711
- G.729
- GSM
Correct answer: Opus
The Opus codec supports wideband and fullband audio, making it the preferred HD voice codec in modern conferencing platforms.
Question 5: What is the primary purpose of echo cancellation technology in conference calls?
- To remove the speaker's own voice from their microphone pickup (Correct answer)
- To record the call for later playback
- To mute background participants
- To compress audio for faster transmission
Correct answer: To remove the speaker's own voice from their microphone pickup
Echo cancellation filters out the feedback loop caused when a microphone picks up audio from a nearby speaker.
Question 6: What does SIP stand for in conference call infrastructure?
- Session Initiation Protocol (Correct answer)
- Secure Internet Protocol
- Standard Integration Platform
- Signal Interchange Process
Correct answer: Session Initiation Protocol
SIP (Session Initiation Protocol) is used to set up, manage, and terminate voice and video sessions in IP-based conferencing.
Conference Call Conference Call Technology & Tools 1
Which protocol is most commonly used to transmit voice data over the internet in conference calls?