How do I set up to call an external trunk?

How do I set up to call an external trunk? It’s a university job and I have to call the PBX central created by a classmate,I did creating a trunk with its IP but not connect

This is a standard operation. Please try to follow the existing documentation. People on the forum are only likely to be interested if you have demonstrated that you have tried this and have provided detailed logging to show how the calls fail, and screen shots of the configuration, to look for obvious mistakes.

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