1. Question:
In the criteria of the “Outbound Rules,” “Calls from Extension(s)” having comma-separated
values will allow multiple extension ranges to be defined.
● Answer: True
2. Question:
For extensions registered over multiple site-to-site VPNs, by default 3CX delivers the audio
between phones if they are on different subnets.
● Answer: False
,3. Question:
Wireshark can, without any additional plugins, decode all codecs including G711A, G711U,
GSM, G729, G726.
● Answer: False
4. Question:
STUN extensions can be configured to connect to the tunnel port of 3CX instead of the SIP port
for more security.
● Answer: False
5. Question:
Your 3CX has only one SIP Trunk and receives a call from number 8135791691. If you have an
“Inbound CID Reformatting” rule on the trunk with “Source Pattern” 813(…)(.*) and “Replace
Pattern” \1\2, what will be displayed as the caller ID on the extension?
● Answer: 5791691
6. Question:
Once Secure SIP has been configured in 3CX, Secure SIP certificates will need to be deployed
manually in phones and softphones OS so that they can communicate.
● Answer: False
7. Question:
The default voicemail PIN of an extension consists of 4 random alphanumerical characters.
● Answer: False
8. Question:
Remote extensions may be provisioned using the HTTP or HTTPS URLs.
● Answer: False
9. Question:
The Virtual Extension of the slave must match the master side virtual extension number.
● Answer: True
, 10. Question:
On outbound calls to external numbers, 3CX will process “Outbound Rules” in a “Best Matching”
way, depending on how many of the criteria match.
● Answer: False
11. Question:
The log files of 3CX are never cleaned, even when you restart the 3CX services.
● Answer: False
12. Question:
You want to troubleshoot a local IP phone that loses registration to 3CX. What’s the first step
you should take?
● Answer: Start a Wireshark capture on the 3CX Server, reboot the phone, and apply the
filter sip.Cseq.Method==REGISTER to check if the registration requests are reaching
3CX.
13. Question:
If your 3CX system has only one SIP trunk, and it receives a call from 422033272020, how can
you display this as +44272020 using inbound caller ID reformatting?
● Answer: This can be achieved with an "Inbound CID Reformatting" rule.
14. Question:
When 3CX has been installed without a fully qualified domain name (FQDN) from 3CX and in
split DNS mode, what must not be installed on the same machine as the phone system?
● Answer: The DNS server must not be installed on the same machine as the phone
system.
15. Question:
What are the steps to upgrade from 3CX version 14 to version 15?
● Answer:
○ Take a full backup of version 14
○ Uninstall version 14
○ Install version 15
○ During installation, restore the version 14 backup
○ Complete the installation of version 15
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