Greek telephone company OTE wants a German court to force engineering giant Siemens to reveal whether it paid bribes to OTE employees to secure a huge contract.
An AFP report also quoted daily Sueddeutsche Zeitung saying that that OTE had gone to the Munich court in the first legal action taken by a foreign company against Siemens over a slush fund the German firm has admitted operating.
OTE wants the court to order Siemens to reveal details of an internal inquiry into its activities in Greece, with a view to eventually suing for damages, the report said.
Greek prosecutors are investigating the 1997 contract, which Siemens is suspected of securing by paying million of dollars to OTE executives.
Greek politicians are also alleged to have benefited from the German company's largesse.
The Siemens scandal erupted in late 2006 and has shaken the group to its core, the report further said.