mediumMultiple Choice
220-1201 Practice Question: A technician is troubleshooting a VoIP phone that…
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?
⚠ Common exam trap
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.
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.
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 carries unencrypted HTTP web traffic, not SIP signalling, so opening it will not let the phone register. It is tempting because SIP over TCP can fall back to HTTP-style transport, but the standard SIP registration port is 5060 (5061 for TLS), which is what the technician must verify.
- ✗
Port 443
Why it's wrong here
SIP registration uses TCP or UDP port 5060, or 5061 for TLS, so 443 is not the port to verify. It is tempting because 443 is the familiar HTTPS port and the phone already pings the server, but the SIP service listens on 5060.
- ✓
Port 5060
Why this is correct
SIP signalling uses TCP or UDP port 5060 for registration and call setup, so that port must be permitted between the phone and the SIP server. Ping success only proves ICMP works, not that SIP signalling is reachable.
- ✗
Port 1720
Why it's wrong here
Port 1720 is the H.323 call-signalling port, a rival VoIP protocol to SIP, so it will not carry SIP REGISTER messages. It is tempting because both are VoIP signalling channels, but H.323 would be the correct choice only for an H.323 endpoint, not a SIP phone.
Go deeper
Related to this question
Learn chapter
Network Command Tools: ping, ipconfig, nslookup, tracert
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
Key term
Session Initiation Protocol
Session Initiation Protocol (SIP) is a signaling protocol used to start, maintain, and end voice and video calls over IP networks.
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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.