How does a home cordless telephone need to be connected by a telephone line?
Cordless phones, like landline telephones, require home phone lines to connect to the mainframe.
Or need a landline to connect the phone line, this one is also the host, but it is also cordless phone, my home will be useful.
Cordless refers to the wireless connection between the host and the receiver. You can move the receiver off the plane and use it in your room. You can also think of the receiver as a Bluetooth headset for the machine, and the signal is transmitted through the landline.