Plantronics, is an Advanced Partner in the technology segment of Siemens Enterprise Partner Program, and as a result collaborate to ensure best in class compatibility and usability for all Plantronics headsets when connected to Siemens DECT telephones and systems. In addition to this a number of Plantronics headsets have been formally tested and approved by Siemens test laboratories and have become officially certified. These include the SupraPlus and the Voyager headsets.