The answer is that the VoIP system is not configured for the T.38 fax protocol. This is the most likely issue because VoIP networks compress audio using codecs like G.711 or G.729, which distort the analog fax tones that a standard fax machine or MFP relies on to negotiate a connection. The T.38 protocol solves this by encapsulating fax data as digital packets, allowing it to travel reliably over IP without audio compression interference. Outgoing faxes may still work because the MFP can sometimes fall back to a slower, more resilient handshake, but incoming faxes fail when the VoIP system lacks T.38 support to properly receive the initial tones. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of VoIP and fax interoperability, a common troubleshooting trap where students blame the MFP or phone line instead of the protocol mismatch. A helpful memory tip: think of T.38 as “Tone 38” — if the tones can’t survive the VoIP compression, faxes fail, so always check for T.38 configuration first.
220-1201 Multifunction Devices Practice Question
This 220-1201 practice question tests your understanding of multifunction devices. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A small office has a multifunction device that prints, scans, and faxes. Users report that incoming faxes are not being received, but outgoing faxes work. The MFP is connected to a VoIP phone system. What is the most likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VoIP system is not configured for T.38 fax protocol.
VoIP systems often use codecs that compress audio, which can interfere with fax tones. The T.38 protocol is designed to transmit faxes over IP networks reliably. Without it, incoming faxes may fail while outgoing faxes might still work if the MFP negotiates differently.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The fax line is plugged into the wrong port on the MFP.
Why it's wrong here
If outgoing faxes work, the line is likely connected correctly; the issue is specific to incoming faxes.
✗
The MFP's fax memory is full.
Why it's wrong here
Full memory would affect both incoming and outgoing faxes, not just incoming.
✓
The VoIP system is not configured for T.38 fax protocol.
Why this is correct
Without T.38, VoIP compression can corrupt fax tones during reception, causing incoming faxes to fail while outgoing faxes may still work.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The MFP's firmware is outdated.
Why it's wrong here
Outdated firmware could cause various issues, but the specific symptom of only incoming faxes failing points to a VoIP protocol issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Multifunction Devices — This question tests Multifunction Devices — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VoIP system is not configured for T.38 fax protocol. — VoIP systems often use codecs that compress audio, which can interfere with fax tones. The T.38 protocol is designed to transmit faxes over IP networks reliably. Without it, incoming faxes may fail while outgoing faxes might still work if the MFP negotiates differently.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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