A method for efficient establishing or configuring a connection between a telecommunications network and a customer premises equipment (CPE) via an access node includes: establishing a physical communication channel between the access; node of the telecommunications network and the CPE; providing a public or private Internet Protocol (IP) address to the CPE for use by the CPE to communicate with an IP Edge node of the telecommunications network; initially assigning a first functionality level to the public or private IP address; and assigning a second functionality level to the public or private IP address, when the telecommunications network is able to federate a network access related identification information to a contract related identification information.