Incoming calls are sporadically displayed as "anonymous"

[Vodnik]

I'm new to 3CX, we have just changed to it from another PABX. A lot of anonymous incoming calls are noticed after the change, that were not at all before.
CO provider is the same. There is also SIP trunk to partner PABX (Avaya). Talking to "anonymous" callers, we didn't find any rule or correlation for why this may happen.
Anonymous call may come from CO or from partner PABX. I didn't capture any anonymous call for analisys yet, because of highly sporadic nature of a problem.
But maybe this is a known issue? What in principle may be the reason for such a problem?

 

[YiannisH_3CX]

Hi @Vodnik

Check the trunk settings in 3CX in the Inbound parameters tab and check from which SIP header the PBX is reading the caller ID from. You can also navigate to your Dashboard / Activity Log / Settings and set the logging level to verbose.
Then one a call is received with anonymous check the logs and see if it arrives like that to the PBX or if the PBX is reading the caller ID from the wrong place.

 

[Vodnik]

@YiannisH_3CX , thank you for advice!
There is a flexibility to set a field from which CallerNum is obtained, good!
Setting logging level to Verbose requires system restart, isn't it? Unfortunately customer works 24/7.
For some reason actual Call Log never contain last calls, only those that are older than 1,5 hour.

 

[YiannisH_3CX]

Setting logging level to Verbose requires system restart, isn't it? Unfortunately customer works 24/7.

Not necessarily but to be sure you should as if the service is constantly engaged it won't do the switch.

For some reason actual Call Log never contain last calls, only those that are older than 1,5 hour.

That is strange. The call log should contain all completed calls. Also make sure you manually refresh the page as it does not auto refresh.