Stupid Question: DIY SIP Trunking

I have FreePBX setup for home use and I’m very happy with it. However, it manages 6 separate lines which are a mix of Google Phone, and 3 paid service providers.

I was wondering why it is not possible to set up my trunking capability so that I don’t have to pay for SIP trunks. Is this even possible?

I suspect it will involve some initial expense for the software and a small block of phone numbers. Has anyone ever done this?

No their is always cost associated with making calls that you have to pay all carriers. No way around it and to be setup as a carrier and into the SS7 networks would be 7 figures of investment

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