The more dependent you are upon SIP trunks, the more diversity you'd better welcome into your configuration. In SIP Trunks: A Call To the Wild, I mentioned I would get with Chris Thompson, Senior ...
If you're intending to use it only between your parent's house and yours, you could probably set up a Wireguard bridge on a couple of Raspberry Pis. You'd have to host a full SIP server at your house, ...
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