| Event ID | Event Logged | Comments |
| 102 | One of the queues has initiated a callback | |
| 2013 | The disk is at or near capacity (Windows Server OS Only) | |
| 4097 | Service started | Service has been started |
| 4098 | Service got signal to stop: %1 | Service is about to stop |
| 4099 | Emergency number (%1) is dialed from %2 | An emergency number was dialed |
| 4100 | Trunk %1 has changed status to %2 | The status of a trunk has changed |
| 4101 | Extension %1 is %2%3 | The registration status of an extension has changed |
| 8193 | License limit is reached, active calls: %1 | A call request was received in excess of the License Key limit of simultaneous calls |
| 12289 | Device %1 had no available outgoing trunk(s) for Call(%2) | An outbound call request over a trunk failed because over the maximum number of calls available through that trunk |
| 12290 | The IP %1 has been blacklisted for %2 sec. Reason: %3 | An IP Address has been blacklisted |
| 12291 | SIP request (%1) from %2 was rejected. Reason: %3. Message: %4 | |
| 12292 | The IP %1 has been blacklisted for %2 sec. Reason: requests rate is too high! | A request was rejected/blocked by the Anti-Hacking module – security breach detected |
| 12293 | Registration at %1 has failed. Destination (%2) is not reachable, DNS error resolving FQDN, or service is not available. | DNS resolution failed or cannot reach remote VoIP Provider |
| 12294 | Call to %1 has failed. %2 replied: %3 | Destination responded with an error code (eg. service unavailable, user not found, insufficient credit, account disabled) – contact trunk provider |
| 12295 | STUN server %1:%2 could not be reached%3 It could be that the STUN server you are using is down or a network problem is preventing STUN resolutions. This might cause problems if you use VoIP Providers. | STUN resolution has failed, timed out, or no backup STUN servers could resolve |
| 12296 | Call from [%2] to [%1] has been rejected by the 3CX Country Blocking Feature [%3]. Reason: %2 contains Prefix %3. Calls to %3 are not allowed by system. Resolution: To allow this call access the 3CX Management Console, Settings, General, and enable the country or continent that matches this prefix. | Outbound call has been rejected because its country code is not on the Allowed Country Codes |
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