Sample Phone Service Business Practice Questions

Try these questions from our free Phone Service Business practice tests. The correct answer and an explanation follow each question.

1. What does QoS (Quality of Service) do in a network supporting VoIP?

   • A. Encrypts all voice packets
   • B. Prioritizes voice traffic over other data to reduce latency and jitter
   • C. Increases internet bandwidth automatically
   • D. Converts analog signals to digital

   Answer: B. Prioritizes voice traffic over other data to reduce latency and jitter

   QoS settings on a network router prioritize voice packets to ensure consistent, high-quality VoIP calls even during high data usage.

2. What does E911 (Enhanced 911) require from business VoIP providers in the US?

   • A. Providing free calling to government agencies
   • B. Automatically transmitting the caller's location information to emergency services when 911 is dialed
   • C. Recording all emergency calls for law enforcement
   • D. Offering 24/7 customer support lines

   Answer: B. Automatically transmitting the caller's location information to emergency services when 911 is dialed

   The FCC's E911 rules require VoIP providers to deliver accurate location information along with the call to public safety answering points (PSAPs).

3. What is latency in a VoIP call, and what is considered an acceptable one-way delay?

   • A. Echo caused by hardware; under 10ms
   • B. The delay between speaking and hearing; under 150ms is ideal per ITU-T
   • C. Packet loss percentage; under 5%
   • D. Background noise level; under 30dB

   Answer: B. The delay between speaking and hearing; under 150ms is ideal per ITU-T

   Latency is the one-way delay in a VoIP call; the ITU-T recommends keeping it under 150ms for acceptable call quality.

4. What additional cost should US businesses account for when budgeting for VoIP services beyond the monthly plan fee?

   • A. No additional costs—VoIP is always all-inclusive
   • B. Taxes, regulatory fees (USF, E911), number porting fees, hardware costs, and international calling charges
   • C. Only state sales tax
   • D. Only the cost of Wi-Fi routers

   Answer: B. Taxes, regulatory fees (USF, E911), number porting fees, hardware costs, and international calling charges

   US businesses should budget for regulatory surcharges like Universal Service Fund (USF) contributions, E911 fees, state taxes, and potential hardware or setup costs.

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