Obligations relating to single billing and collection

(1) The Federal Network Agency may require an undertaking with significant market power to provide services relating to single billing and to the receipt or initial collection of payments, in accordance with the following subsections.
(2) Unless the end user agrees otherwise with other providers of publicly available telecommunications services, the billing party must issue the end user with an invoice that, irrespective of the tariff structure, also itemises the charges for telecommunications services and telecommunications-based services of other providers used via the end user's network access. Payment to the billing party for these charges is made uniformly for the entire service used, as for its own claims.
(3) The following obligations may not be imposed:
1. an obligation to issue invoices for
a) services charged independently of time within the meaning of subsection (2), first sentence, with charges exceeding EUR 10,
b) time-based telecommunications-based services with charges exceeding EUR 2 per minute, and
c) all services for which a verification procedure is required;
2. an obligation to process complaints relating to services billed for third parties;
3. an obligation to issue reminders; and
4. an obligation to enforce third-party claims.
(4) The billing party must transmit to providers of publicly available telecommunications services the name, address, and connection identifier of the debtor, insofar as this is necessary for the purposes of complaint processing, issuing reminders, and enforcing claims for services within the meaning of subsection (2), first sentence.
(5) Providers of publicly available telecommunications services must ensure, vis-à-vis the billing party, that no data records for services are transmitted to it for billing that do not comply with the statutory provisions. The billing party bears neither responsibility nor liability for services billed for third parties.
(6) The billing party must state prominently in its reminders that the customer may pay to the billing party, with discharging effect, not only the reminder amount but also the original invoice amount, where higher.
(7) Obligations imposed under subsection (1) do not apply where the billing party has concluded an agreement with the predominant part of the relevant market of providers of publicly available telecommunications services selectable by its connection customers, and also grants other providers not party to such an agreement non-discriminatory access to those services on the terms set out in the agreement.