Do i actually need a phone line for my own Pbx server? (trunks?)

I have a server set up, and i can easily make calls between softphones here on the company, but i want to make/receive calls from outside, how do i do it?
i have Fxo and Fxs hardware set up, but i’ve seen little to none info on sip/analog trunking, most just say to pay a sip Company… (or a normal phone number and set up the fxo/fxs hardware) is it really the only way?

Yes. You need a connection to the PSTN. You can do that over POTS lines with your FXS/FXO hardware or you can get a SIP provider. Either way, you need a provider.

You could use SIP, POTS, or T1/E1

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