If you don’t need external calling you don’t need a trunk, it’s just for connecting to the outside world. I found [[https://www.asterisk.org/|Asterisk]] was a good place to start. The config is rather involved though, so there are various front ends for it.
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Is it possible to just run your own SIP-trunk? We’re not intending on sending or receiving calls from external numbers outside of our little network.
If you don’t need external calling you don’t need a trunk, it’s just for connecting to the outside world. I found [[https://www.asterisk.org/|Asterisk]] was a good place to start. The config is rather involved though, so there are various front ends for it.
If you don’t need external calls sip trunk is not needed.