Add a Music on Hold Instance to a department. The response is either SuccessResponse or ErrorResponse. Delete a Music On Hold department instance. The response is either SuccessResponse or ErrorResponse. Get a Music On Hold data for a group or department instance. The response is either GroupMusicOnHoldGetInstanceResponse16 or ErrorResponse. Response to the GroupMusicOnHoldGetInstanceRequest16. Returns a list of all departments that have a Music On Hold instance. The response is either GroupMusicOnHoldGetDepartmentListResponse or ErrorResponse. It is possible to get the instances within a specified department. Response to the GroupMusicOnHoldGetDepartmentListRequest. Modify data for a group or department Music On Hold Instance. The response is either SuccessResponse or ErrorResponse. Request the system level data associated with Music On Hold. The response is either a SystemMusicOnHoldGetResponse or an ErrorResponse. Response to SystemMusicOnHoldGetRequest. Modify the system level data associated with Music On Hold. The response is either a SuccessResponse or an ErrorResponse. Request the user level data associated with Music On Hold. The response is either a UserMusicOnHoldGetResponse or an ErrorResponse. Response to UserMusicOnHoldGetRequest. Modify the user level data associated with Music On Hold. The response is either a SuccessResponse or an ErrorResponse. Request the user level data associated with Music On Hold User. The response is either a UserMusicOnHoldUserGetResponse16 or an ErrorResponse. Response to UserMusicOnHoldUserGetRequest16. Modify data for Music On Hold User. The response is either a SuccessResponse or an ErrorResponse. Delay in milliseconds. Music On Hold Message Selection. Contains the music on hold source configuration. Contains the music on hold source configuration. Contains the music on hold source configuration. Music On Hold User Message Selection. Contains the music on hold user source configuration. Contains the music on hold user source configuration.