3CX Advanced Certification Practice Exam

3CX ADVANCED

CERTIFICATION PRACTICE

EXAM Question 1: In the criteria of the 'Outbound Rules', can 'Calls from Extension(s)' having comma-separated values allow multiple extension ranges to be de�ned?

Choices:

1) Yes, but only for internal calls.2) No, only single extensions are supported.3) Yes, multiple extension ranges can be de�ned.4) No, it requires separate rules for each range.

Correct Answer: Yes, multiple extension ranges can be de�ned.

Explanation: Comma-separated values in the 'Calls from Extension(s)' �eld allow multiple extension ranges to be de�ned in a single rule.Page 1

Question 2: Your 3CX has one SIP Trunk and receives a call from number 8135791691.If you have an 'Inbound CID Reformatting' rule with 'Source Pattern' 813(...)(.*) and 'Replace Pattern' \1\2, what will the extension display as the caller ID?

Choices:

1) 8135791691

2) 5791691

3) +8135791691

4) 579169

Correct Answer: 5791691

Explanation: The pattern captures the 3 digits after 813 as group 1, and the rest as group 2.Replacing with \1\2 outputs 5791691.Question 3: For extensions that are registered over multiple site-to-site VPNs, by default 3CX delivers the audio between phones if they are on di�erent subnets.

Choices:

1) True 2) False 3) Only if PBX delivers audio is checked 4) Only for routed VPNs

Correct Answer: False

Explanation: False. By default, endpoints try to send audio directly to each other (peer-to-peer RTP) unless 'PBX Delivers Audio' is enabled for extensions across di�erent subnets.Page 2

Question 4: On outbound calls to external numbers, 3CX will process 'Outbound

Rules' in a 'Best Matching' way, depending on how many of the criteria match.

Choices:

1) True 2) False 3) Only for SIP Trunks 4) Only for Bridge routing

Correct Answer: False

Explanation: False. 3CX processes Outbound Rules in a top-down order (�rst match wins), not by 'best match'.Question 5: Wireshark can, without any additional plugins, decode all voice codecs including G.711A, G.711U, GSM, G.729, and G.726.

Choices:

1) True 2) False 3) Yes, but only on Linux 4) Yes, but only on Windows

Correct Answer: False

Explanation: False. Wireshark natively supports G.711 but requires additional plugins or con�gurations for proprietary or heavily compressed codecs like G.729.Page 3