VoIP & IP Telephony Interview Questions & Answers

Are you preparing for a VoIP job interview?

This practice test is designed to help you assess your VoIP knowledge, prepare for VoIP job interviews, master key concepts, and gain confidence for real-world VoIP administrator roles.

This test covers essential VoIP topics, including SIP, RTP, QoS, VoIP gateways, codecs, and PSTN. You’ll face real-world scenarios and multiple-choice questions that challenge your understanding of VoIP technologies and help you identify areas for improvement.

Q&A examples:

Which layer of the OSI model does SIP operate on?

• a) Application layer

• b) Transport layer

• c) Network layer

• d) Data link layer

• Answer: a) Application layer

What is the purpose of an FXS port on a VoIP gateway?

• a) To connect to the PSTN

• b) To connect to an analog telephone

• c) To connect to an IP phone

• d) To connect to a fax machine

• Answer: b) To connect to an analog telephone

What is the primary purpose of configuring a Voice VLAN in a VoIP network?

• a) To separate voice and data traffic for improved security and quality

• b) To enable high-speed internet for voice traffic

• c) To allow only VoIP devices to access the network

• d) To automatically assign IP addresses to VoIP phones

• Answer: a) To separate voice and data traffic for improved security and quality

What is the default sampling rate used by G.711 codec?

• a) 8 kHz

• b) 16 kHz

• c) 44.1 kHz

• d) 64 kHz

• Answer: a) 8 kHz

This practice test will help you identify knowledge gaps, strengthen your VoIP skills, and boost your confidence before an interview. Get ready to prove your VoIP expertise and take your career to the next level!

Start the test now and get interview-ready!