Outgoing calls ring once and abruptly hang up.

[onlylegendleft]

Everything else works fine, but out going calls on all extensions do this.

 

[Saqqara]

We require a lot more info on your setup, please answer the questions in this post https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

Have you created outbound rules https://www.3cx.com/blog/voip-howto/outbound-rules-a-complete-example/

What does the activity log, telling you want is happening to the call