- A
Port 80
Why wrong: Port 80 is for HTTP, not SIP registration.
- B
Port 443
Why wrong: Port 443 is for HTTPS, not SIP.
- C
Port 5060
Port 5060 is the default port for SIP traffic.
- D
Port 1720
Why wrong: Port 1720 is used for H.323, a different VoIP protocol.
Question 205 of 1,020
220-1201 TCP & UDP Ports Practice Question
This 220-1201 practice question tests your understanding of tcp & udp ports. 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 technician is troubleshooting a VoIP phone that cannot register with the SIP server. The phone has a valid IP address and can ping the server. Which port should be verified as open for SIP traffic?
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
✓
Port 5060
SIP (Session Initiation Protocol) uses UDP or TCP port 5060 by default for signaling between endpoints and the SIP server. Since the phone has a valid IP and can ping the server, the issue is likely a firewall blocking port 5060, preventing registration.
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.
- ✗
Port 80
Why it's wrong here
Port 80 is for HTTP, not SIP registration.
- ✗
Port 443
Why it's wrong here
Port 443 is for HTTPS, not SIP.
- ✓
Port 5060
Why this is correct
Port 5060 is the default port for SIP traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Port 1720
Why it's wrong here
Port 1720 is used for H.323, a different VoIP protocol.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between SIP (port 5060) and other common protocols like HTTP (80), HTTPS (443), or H.323 (1720), expecting candidates to confuse VoIP signaling ports with web or video conferencing ports.
Detailed technical explanation
How to think about this question
SIP typically uses port 5060 for unencrypted signaling (UDP or TCP) and port 5061 for TLS-encrypted signaling. The phone sends a REGISTER request to the SIP server on this port; if the port is blocked, the server never receives the request, even though ICMP ping succeeds. In some environments, SIP over TCP on port 5060 may be required if UDP is unreliable.
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.
TExam Day Tips
- 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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
TCP & UDP Ports — This question tests TCP & UDP Ports — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Port 5060 — SIP (Session Initiation Protocol) uses UDP or TCP port 5060 by default for signaling between endpoints and the SIP server. Since the phone has a valid IP and can ping the server, the issue is likely a firewall blocking port 5060, preventing registration.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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