Patent ID: 7013132

Claim:
Procedure for the allocation and assignment of telephone numbers in a telecommunications network, whereby the telephone numbers are assigned to the subscribers of the telecommunications network in addition to the existing subscriber telephone numbers, comprising the following steps: providing of a number of number contingents containing temporary, anonymous TAC telephone numbers; assigning of number contingents to at least one administrative instance; assigning individual or collective TAC telephone numbers of the number contingent through the administrative instance to the subscriber, in that a TAC telephone number of a contingent is assigned to exactly one existing subscriber telephone number upon request, characterized in that the contingents are either open number contingents, the TAC telephone numbers of which are reachable for everyone, or closed contingents, the TAC telephone numbers of which are only reachable for other TAC telephone numbers of the same contingent, whereby the TAC telephone number of the caller is always displayed as the telephone number display for calls within a closed contingent.