Deutsche Telekom (DTEGn.DE), Orange (ORAN.PA), Telefonica (TEF.MC), Telecom Italia (TLIT.MI) call it a fair share contribution, especially as the six largest content providers account for just over half of data internet traffic.
The European Commission's industry chief Thierry Breton has said he will launch a consultation in early 2023 before proposing legislation.
"We as member states have always considered an open and transparent debate on substance on the 'fair share' topic as of great importance," Austria, Estonia, Finland, Ireland, the Netherlands and Germany, Europe's leading economy, wrote in a joint letter to the Commission.
"However, we urge the Commission to further create transparency on its intended timeline, analyses and steps on this topic," they said.
Reporting by Foo Yun Chee; editing by Barbara LewisOur Standards: The Thomson Reuters Trust Principles.