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In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma separated values will allow multiple extension ranges to be defined True The Virtual Extension of the slave must match the master side virtual extension number True For extensions that are registered over multiple site-to-site VPNs, by default 3CX delivers the audio between phones if they are on different subnets. False On outbound calls to external numbers, 3CX will process "Outbound Rules" in a "Best Matching" way, depending on how many of the criteria match. False Wireshark can - without any additional Plugins Decode all Codecs including G711A, G711U, GSM, G729, G726 False STUN extensions can be configured to connect to the tunnel port of 3CX instead of the SIP port for more security. False The log files of 3CX are never cleaned even when you restart the 3CX Services False 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. False Remote extensions may be provisioned using the HTTP or HTTPS URLs False The default Voicemail PIN of an extension consist of 4 random alphanumerical characters. False Your 3CX has only one SIP Trunk and receives a call from number . If you have a "Inbound CID Reformatting" rule on the Trunk with "Source Pattern" 813(...)(.*) and "Replace Pattern" 12, the extension that receives the call will see "5791691" as the caller ID on its display. True When 3CX has been installed without a FQDN from 3CX and in split DNS mode, the DNS server must not be installed on the same machine as the phone system. True Your Local IP Phone loses the registration to 3CX and you want do troubleshoot the issue. You should start a Wireshark Capture on the 3CX Server, reboot the phone, and then apply the Filter sip.Cseq.Method==REGISTER in order to see if registrations are reaching 3CX True Your 3CX has only one SIP Trunk and receives a call from number and you want it to be presented on the extension display as . You can do this with a "Inbound CID Reformatting" rule on the Trunk with "Source Pattern" 44(..)(..)(.*) and "Replace Pattern" +443. True When selecting the option "I need a 3CX FQDN" an internal DNS is not mandatory True The order of "Inbound Rules" is not important when you have DID and CID "Inbound Rules", CIDs always have higher priority. False You have a Master Bridge with 3-digit extensions 1xxx and a Slave Bridge with 4-digit extensions 2xxx. In the "Outbound Rules" you use to rote calls across the bridge, using a prefix is mandatory. False You have run the 3CX "Firewall Checker" and comes up as Green, but you still have audio issues and calls dropping on on outbound / inbound calls. Can SIP ALG be the culprit? True An extension will be allowed up to 25 attempts (default) for authenticating successfully, after what it will be blacklisted for the default blacklisting interval of 1800 minutes. False The 3CX SIP port should be filtered by firewall ACL rules to maximize security and allow only trusted IPs to reach it (VoIP providers or STUN extensions if any). True SRTP will secure calls so that a middle-man can't see the SIP traffic in plain-text. False.CONTINUED...