It will be necessary to transfer between entities of a Public Land Mob ile Network (PLMN) information specific to the PLMN in order to deal w ith the specific behaviour of roaming mobile stations. The Signalling System No. 7 specified by CCITT is used to transfer this information. This ETS describes the requirements for the signalling system and the procedures needed at the application level in order to fulfil these si gnalling needs. Clauses 1 to 4 are related to general aspects such as terminology, mob ile network configuration and other protocols required by MAP. MAP consists of a set of MAP services which are provided to MAP servic e-users by a MAP service-provider. Clauses 5 to 10 of this ETS describe the MAP services. Clauses 11 to 14 define the MAP protocol specification and the behavio ur of service provider (protocol elements to be used to provide MAP se rvices, mapping on to TC service primitives, abstract syntaxes...). Clauses 15 to 21 describe the MAP user procedures which make use of MA P services.