VDV Voice Systems 3

Question 1

What is the primary purpose of a dial plan in a PBX or IP-PBX system?

Accepted Answer

Specify rules for routing calls based on dialed digits

Answer

A dial plan defines the rules that a PBX uses to interpret dialed digit strings and route calls to the appropriate destination.

Question 2

Which type of VoIP gateway converts calls between the analog PSTN and a SIP-based IP network?

Accepted Answer

Media gateway

Answer

A media gateway performs the conversion between circuit-switched PSTN signals and packet-switched VoIP protocols such as SIP.

Question 3

What does QoS DSCP marking AF41 indicate for VoIP traffic?

Accepted Answer

Assured Forwarding class 4, drop probability 1 — high priority multimedia

Answer

DSCP AF41 (Assured Forwarding 41) indicates Class 4, low drop precedence, typically used for interactive video and high-priority multimedia traffic.

Question 4

A hunt group is configured with a 'linear' (top-down) hunting method. Which phone rings first?

Accepted Answer

The first phone in the list, every time

Answer

In linear hunting, the system always starts at the first agent in the list and works down, meaning the first phone rings on every new call if it is available.

Question 5

Which cable category is the minimum recommended for deploying PoE-powered IP phones to avoid excessive heat buildup?

Accepted Answer

Cat 6

Answer

Cat 6 cable is recommended for PoE applications because its larger conductors produce less resistance and less heat under the current loads used by PoE devices.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Voice Systems 3