Queue RouteFailed with Internal Server Error

[Zalhera]

We noticed that some calls in our queues are not being assigned to some extensions.
After some investigation we found that 3CX is trying to route these calls to the extensions, but the 3CX Windows Client is sending an Internal Server Error back.

Unfortunately we couldn't find a way to to get more details on the Internal Server Error.
I attached the relevant parts of the 3CXSystemServiceLog and the Windows Client logfile of an affected agent.

If someone knows if this is a bug in 3CX or what we can do to find out how to fix this error, that would be great.

 

[leejor]

You might want to provide additional information about your system...

https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

Is it always the same agents affected? A pattern?

Are these agents able to accept, or originate other call types (internal, direct, or transferred external call)

 

[Zalhera]

There are several agens that are more affected, but it's relatively random with which agent exactly the error occurs. There are only problems with external calls that should be routed through queues, all other calls work without any problems (both internal and external)

Additional System Information:

- Version: Enterprise Annual 16.0.622
- Server OS: SMP Debian 4.9.210-1+deb9u1
- Trunk Provider: Telekom, Sipgate
- Firewall Passed: Yes
- Custom Phone Templates: No