I use a Grandstream (brand)? "box" for my second line.? It's on my network (LAN), hence, internet. It plays well with my other devices on my LAN as well.? So, from IP to a POTS line loop start, like we had in the 1960's. Your ISP could set it up for access to the PSTN.
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Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
Karl Shoemaker