Method for operating a customer premises equipment with a broadband access network of a telecommunications network, wherein the broadband access network comprises at least one access node, wherein a specific access node of the broadband access network is enabled to operatively connect the customer premises equipment to the telecommunications network in view of providing communication services and/or communication access services to a user related or connected to the customer premises equipment, wherein the broadband access network comprises a service edge entity or functionality and a policy controller entity or functionality as well as a business support system entity or functionality, wherein, in case that the customer premises equipment is unknown to the telecommunications network or has previously not been connected to the telecommunications network, the method comprises the following steps: -- in a first step, the customer premises equipment transmits a request to be connected to the broadband access network, via the specific access node, to the service edge entity or functionality and/or to the policy controller entity or functionality, wherein thereby the specific access node also transmits a line ID information related to the connection, or port, used by the customer premises equipment, -- in a second step, the customer premises equipment receives, from the service edge entity or functionality and/or from the policy controller entity or functionality the line ID information, -- in a third step, the customer premises equipment initiates a protected data transmission tunnel to the business support system entity or functionality, wherein the data transmission tunnel is specific to the customer premises equipment, and wherein the line ID information as well as an identifier information, relating to the customer premises equipment, is transmitted, using the data transmission tunnel, to the business support system entity or functionality. wherein a specific access node of the broadband access network is enabled to operatively connect the customer premises equipment to the telecommunications network in view of providing communication services and/or communication access services to a user related or connected to the customer premises equipment, wherein the broadband access network comprises a service edge entity or functionality and a policy controller entity or functionality as well as a business support system entity or functionality, wherein, in case that the customer premises equipment is unknown to the telecommunications network or has previously not been connected to the telecommunications network, the method comprises the following steps: -- in a first step, the customer premises equipment transmits a request to be connected to the broadband access network, via the specific access node, to the service edge entity or functionality and/or to the policy controller entity or functionality, wherein thereby the specific access node also transmits a line ID information related to the connection, or port, used by the customer premises equipment, -- in a second step, the customer premises equipment receives, from the service edge entity or functionality and/or from the policy controller entity or functionality the line ID information, -- in a third step, the customer premises equipment initiates a protected data transmission tunnel to the business support system entity or functionality, wherein the data transmission tunnel is specific to the customer premises equipment, and wherein the line ID information as well as an identifier information, relating to the customer premises equipment, is transmitted, using the data transmission tunnel, to the business support system entity or functionality. -- in a first step, the customer premises equipment transmits a request to be connected to the broadband access network, via the specific access node, to the service edge entity or functionality and/or to the policy controller entity or functionality, wherein thereby the specific access node also transmits a line ID information related to the connection, or port, used by the customer premises equipment, -- in a second step, the customer premises equipment receives, from the service edge entity or functionality and/or from the policy controller entity or functionality the line ID information, -- in a third step, the customer premises equipment initiates a protected data transmission tunnel to the business support system entity or functionality, wherein the data transmission tunnel is specific to the customer premises equipment, and wherein the line ID information as well as an identifier information, relating to the customer premises equipment, is transmitted, using the data transmission tunnel, to the business support system entity or functionality.