In telecommunications, register signaling is concerned with conveying addressing information, such as the calling and/or called telephone number. In Telecommunication, signalling (UK spelling or signaling (US spelling has the following meanings The use of signals for controlling communications A telephone number or phone number is a sequence of numbers used to call from one Telephone line to another in a Telephone network.
This is to be contrasted with line signaling. Line signaling is a class of Telecommunications signaling protocols.