Hello, How can I able to make a local call using the Dial Pad within PC and landline phone connection, that connected into RS-232/Ethernet port/Mini LAN Port having no any web or 3rd party involvement or Internet connectivity nor a VOIP under Linux OS?
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More aboutcommunicating landline phone
Same way that you can go to the store when locked in a room with no windows or doors and being tied to a chair.
In other words, you can't. You need SOME sort of outside connection, internet, analog line and a modem.