Business Phone Systems VoIP Fundamentals 2 — Questions and Answers
Question 1: What does RTP stand for in VoIP communications?
- Real-time Transport Protocol (Correct answer)
- Remote Telephony Platform
- Routing Transfer Protocol
- Registered Trunk Protocol
Correct answer: Real-time Transport Protocol
RTP (Real-time Transport Protocol) carries the actual audio and video media streams in a VoIP call.
Question 2: Which VoIP codec offers the highest audio quality with the most bandwidth usage?
- G.711 (Correct answer)
- G.729
- G.723.1
- iLBC
Correct answer: G.711
G.711 provides the highest audio quality at 64 kbps but uses more bandwidth than compressed codecs.
Question 3: What is a SIP trunk?
- A virtual phone line connecting a PBX to the PSTN via the internet (Correct answer)
- A physical cable for analog phones
- A type of voicemail system
- A conference bridge hardware unit
Correct answer: A virtual phone line connecting a PBX to the PSTN via the internet
A SIP trunk is a virtual connection that links an on-premises PBX to the public telephone network over the internet.
Question 4: What does NAT traversal solve in VoIP deployments?
- Allows VoIP traffic to pass through network address translation firewalls (Correct answer)
- Encrypts voice packets end-to-end
- Reduces codec bandwidth consumption
- Manages call routing tables
Correct answer: Allows VoIP traffic to pass through network address translation firewalls
NAT traversal techniques like STUN and TURN allow VoIP media to pass through NAT firewalls that would otherwise block it.
Question 5: Which quality metric measures the percentage of VoIP packets that fail to reach their destination?
- Packet loss (Correct answer)
- Jitter
- Latency
- MOS score
Correct answer: Packet loss
Packet loss is the percentage of transmitted packets that never arrive, which directly degrades call quality.
Question 6: What is SRTP used for in VoIP?
- Encrypting voice media streams (Correct answer)
- Routing calls between extensions
- Managing voicemail storage
- Load balancing SIP servers
Correct answer: Encrypting voice media streams
SRTP (Secure Real-time Transport Protocol) encrypts voice media streams to prevent eavesdropping.
Business Phone Systems VoIP Fundamentals 2
What does RTP stand for in VoIP communications?