Vermilion box

The vermilion box is a hypothetical portable improvised line emulator.wikipedia
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Ringing (telephony)

ringingmagenta boxcall bell
The vermilion box incorporates three more basic phreaking boxes: the magenta box, which generates the AC ringing signal required to make the target telephone ring; the orange box, which generates caller ID (although it is not a proper call-waiting caller ID orange box that is used but a modified orange box that generates on-hook (idle state) caller ID); and the beige box that is used to conduct the actual conversation.
A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified data) is called a vermilion box.

Caller ID

caller line identificationCLIcall display
The vermilion box incorporates three more basic phreaking boxes: the magenta box, which generates the AC ringing signal required to make the target telephone ring; the orange box, which generates caller ID (although it is not a proper call-waiting caller ID orange box that is used but a modified orange box that generates on-hook (idle state) caller ID); and the beige box that is used to conduct the actual conversation. Its function is to spoof not only caller ID but every other aspect of an incoming telephone call, including ringing and DC line voltage.

Phreaking

phone phreakphreakphreaker
The vermilion box incorporates three more basic phreaking boxes: the magenta box, which generates the AC ringing signal required to make the target telephone ring; the orange box, which generates caller ID (although it is not a proper call-waiting caller ID orange box that is used but a modified orange box that generates on-hook (idle state) caller ID); and the beige box that is used to conduct the actual conversation.

Beige box (phreaking)

beige boxbeige boxing
The vermilion box incorporates three more basic phreaking boxes: the magenta box, which generates the AC ringing signal required to make the target telephone ring; the orange box, which generates caller ID (although it is not a proper call-waiting caller ID orange box that is used but a modified orange box that generates on-hook (idle state) caller ID); and the beige box that is used to conduct the actual conversation.

Vermilion

vermillionred-orangeorange-red
The vermilion box is named, following the tradition of naming phreaking boxes after colors, for a color (vermilion) that is similar to a combination of the color names of two of the component phreaking boxes from which this box is made: orange and magenta.

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
* Analog telephone adapter, a device which makes a Voice over IP connection appear to be a standard outside line.

Ringdown

Private line automatic ringdownmagneto crank telephonessecure line
In theory, a two-line adapter configured for ringdown (where taking one side off-hook causes the other to ring, displaying a pre-configured caller ID name or number) could serve as a line emulator, requiring only a handset and DC power source.