This Technical Specification deals with naming@ numbering@ and addressing issues specific to calls from IP based terminal to terminals in an Switched Circuit Network (SCN) for TIPHON scenario 1. It includes the name for the SCN terminal that is used by the IP based terminal. The present document is applicable to equipment performing the roles of gatekeeper and gateway@ and also to the IP end user. Where the text indicate the status of a requirement (i.e. as strict command or prohibition@ as authorisation leaving freedom@ or as a capability or possibility)@ this may modify the nature of a requirement within a referenced standard used to provide the capability.