My home office is connected to an external hosted Asterisk service for all company phone calls. PSTN calls go to a separate phone. I’m wondering if I can set up a home Asterisk server to act as a proxy onto the hosted service and - via a POTS to IP interface - handle calls over my POTS line as well?
If this were possible might it also allow me to use a Cisco 7970 phone that’s currently gathering dust as - being behind NAT - it won’t register with the hosted service (evidently it’s well documented that these phones will only work with servers on the same subnet).
If I understand you correctly you want to have Cisco Phone -> Home Asterisk Server -> Remote assterisk server (and have some calls go out over your local PSTN) ? If that is correct then yes you can do that. You can set up your system that with a specific prefix it should go out through the PSTN and through another prefix should use VOIP.