Supported by IP Office core software level 2.1(31) minimum * IP403, IP406 V1, IP406 V2, and IP412 * IP500 running R4.2 or earlier; Professional Edition is required * IP500 running R5.0 or higher * IP500 V2 control unit running R6.0 or higher * Digital station ports for use with 1400, 2400, 4400, 5400, and 6400 series digital telephones. Also compatible with 3810 wireless telephone. * Also compatible with 9500 series digital phones on IP Office R7.0 or higher