Method for supporting multiple registration from the same user requested from different terminals in a telecommunications system requiring to manage information related to the location of said user and related to the plurality of identifiers that identify said user in said system. The method allowing further multiple session establishment to any of those terminals. In the home server of said user it is stored a plurality of private identities related to the subscriber data of said user together with, at least, a public identity. Each registration of said user contains a public identity assigned to said user and a private identity among the plurality of said private identities assigned to said user.