Use own a Sennheiser PC151 PC and wanted this always also use instead of the rather unsatisfactory mobile headsets. With this adapter the connection is 2x 3pin. Mini-jack to 1x 4pin. without any problems and thus you can also use high quality headsets with the phone
The following devices have been successfully tested: - DECT Phone AVM C4 - Blackberry 9900 - Nokia Lumia's
Thus, should the allocation of the 4-pin. Connector constitute a 'common' variant. (Apple has not tested)
