My home fibre bradband ISP provides me with a Huawei HG8240 optical network terminal. This has one ethernet port and one phone port. The phone port is active, but unused at the moment.
The ethernet port is connected with a linux box, acting as a router, dns server, dhcp server and many more things. The linux box has two ethernet interfaces, one connected to the Huawei device facing the wan, the other connected to a switch and servicing various access points and cabled stations in the house.
My goal: I would like to route phone calls originated from wireless devices connected to the lan (e.g. tablets and smartphones) via the phone line provided by the ISP.
I reckon I need:
- a voip server running on the linux box
- a voip client compatible with the server running on the tablets and smartphones
- some physical device which connects the linux machine to the Huawei telephone port, compatible with the voip server. Does anybody has suggestions about open source packages and hardware devices which may allow to set this up?
Regarding the physical device, what is the name of the device I am looking for? I tried to search for "usb to voip", "usb to sip", "connect a pc to a phone line", but all devices I could find seem oriented to replace the phone line with various voip service, which is not what I need.