Business Phone Systems VoIP Fundamentals 2

Question 1

What does RTP stand for in VoIP communications?

Accepted Answer

Real-time Transport Protocol

Answer

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?

Accepted Answer

G.711

Answer

G.711 provides the highest audio quality at 64 kbps but uses more bandwidth than compressed codecs.

Question 3

What is a SIP trunk?

Accepted Answer

A virtual phone line connecting a PBX to the PSTN via the internet

Answer

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?

Accepted Answer

Allows VoIP traffic to pass through network address translation firewalls

Answer

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?

Accepted Answer

Packet loss

Answer

Packet loss is the percentage of transmitted packets that never arrive, which directly degrades call quality.

Business Phone Systems Practice Test