Cisco has ended a long-running sales partnership with ZTE, according Reuters, following allegations that ZTE illegally shipped Cisco gear to Iran. The report cites an a Cisco investigation, as well as investigations by the U.S. Commerce Department, a congressional committee, and the FBI.
http://www.reuters.com/article/2012/10/08/us-cisco-zte-iran-idUSBRE89709N20121008