En norrlänning
What do you mean by “a block of external phone numbers?” We’d like to simply have our own internal numbers ideally, nothing to connect to the regular phone network.
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Depending on the services you provide, the usual standard ports. So if you run http/https services, port 80 and 443 respectively.
You seem to answer your own question.
This is just a copy of the original EU parliament headline.
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.