This question already has an answer here:
I have an ADSL line with 20Mbit/s downstream and 1Mbit/s upstream. Is it possible to make voice phone calls in Linux/Windows 7 using my own land line?
I don't want a VOIP software (like skype), nor an external service which requires an account. Just make a call as I make using a phone device, but using a computer connected to landline through a router.
Linux solution is preferred over Windows 7, if it's possible.
I've been searching how to do it, but I just found VOIP solutions (which requires an external service) or using a 56Kbps modem, but nothing about ADSL line.
I've seen this one: Can TP-Link router make phone calls?, but I'm not sure if we both ask same question. For instance, I don't need, simultaneously, data and voice. I could disconnect internet connection, if needed. And this other: Receive and route phone calls through computer, seems to much complicated. I don't need multiple lines.
I think my question is not duplicated, because is not answered in that post.
If I'm not wrong (correct me if I am), all answers, like asterisk, need a SIP provider, and that's not what I want. I don't want to pay for another provider. I already have a company who provides my land line (and internet).
In other words: I don't want to make calls through internet, I want to make calls from computer using my land line provider. Is that possible?