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220-1201 Practice Question: A company's multifunction printer supports faxing…
A company's multifunction printer supports faxing over VoIP. Users report that faxes are frequently incomplete or fail to send. The fax line is connected to an analog telephone adapter (ATA). What should you check first?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the ATA's configuration to ensure T.38 fax relay is enabled.
Fax over VoIP is sensitive to jitter and latency. The ATA's settings for fax passthrough (T.38) must be enabled and properly configured. Without T.38, fax data may be corrupted by voice codecs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Replace the fax modem card in the printer.
Why it's wrong here
Replacing the fax modem card in the printer is an incorrect troubleshooting step because the issue pertains to faxing over VoIP, not traditional analog faxing directly connected to a Public Switched Telephone Network (PSTN) line. The printer's internal fax modem is designed to handle analog signals for a direct PSTN connection, which is bypassed when an Analog Telephone Adapter (ATA) is used to convert analog fax signals to digital packets for the IP network. The problem lies in the digital conversion and transmission over the IP network, not the printer's internal analog hardware.
- ✓
Check the ATA's configuration to ensure T.38 fax relay is enabled.
Why this is correct
Checking the ATA's configuration to ensure T.38 fax relay is enabled is the correct troubleshooting step because T.38 is the industry standard protocol specifically designed for reliable fax transmission over IP networks. Standard voice codecs (like G.711) are prone to packet loss, jitter, and compression artifacts that corrupt sensitive fax tones during VoIP transmission. T.38 mitigates these issues by converting fax tones into a robust data stream, ensuring successful and error-free fax over IP (FoIP) operations.
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Increase the printer's print resolution.
Why it's wrong here
Increasing the printer's print resolution is an irrelevant action for troubleshooting fax transmission issues. Print resolution dictates the clarity and detail of images produced on paper by the printer's local print engine, affecting the physical output quality, not the quality or success of the digital or analog signal sent during a fax transmission. Faxing standards govern the encoding and transfer of image data across the network, which are entirely separate from the device's local output resolution settings.
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Disable the printer's firewall.
Why it's wrong here
Disabling the printer's firewall is an inappropriate troubleshooting step as it primarily governs network access to the printer's IP-based services, such as printing or scanning over a local area network (LAN). Faxing over VoIP relies on the Analog Telephone Adapter (ATA) and the broader network infrastructure to convert and transmit fax data, not the printer's internal firewall. The printer's firewall would not interfere with the analog fax signal being sent from the printer's fax port to the ATA for VoIP conversion.
Go deeper
Related to this question
Learn chapter
Printer Types and Components
Key term
Voice over IP
Voice over IP (VoIP) is a technology that lets you make phone calls using an internet connection instead of a traditional telephone line.
Key term
Latency
Latency is the time delay between a request being sent over a network and the response being received, often measured in milliseconds.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.