Solved There's incoming call on the line '' marked as outbound-only! Error

[Mwamba]

We have an IP based trunk that was working but now we can't make either inbound or outbound calls. Calls between extensions are working.
When I test an inbound call and check the logs I see the following error:


On wireshark when I view the flow for the call I get a 600 Busy Everywhere error from 3CX:



The IP ending with 38 is the ISPs SIP server and the IP ending with 26 is 3CX's IP. The SIP trunk is an IP based SIP trunk that is plugged in on a second network card on 3CX's server. As recommended there is only one default route to the internet and there are permanent static routes to the Service Provider's IPs. The setup has been working for several months and it stopped working today.
Anyone with a similar problem who can assist?

 

[Mwamba]

I managed to resolve, the issue by enabling inbound and outbound calls on the trunk:

 

[YiannisH_3CX]

Glad to see the issue has been resolved and thank you for updating the thread with your solution.