code: func (r Network_Storage_Group_Iscsi) AttachToVolume(volume *datatypes.Network_Storage) (resp bool, err error) {
  	params := []interface{}{
  		volume,
  	}
  	err = r.Session.DoRequest("SoftLayer_Network_Storage_Group_Iscsi", "attachToVolume", params, &r.Options, &resp)
  	return
  }
docs: // Use this method to attach a SoftLayer_Network_Storage volume to this group.  This will automatically enable access to this volume for any SoftLayer_Network_Storage_Allowed_Host objects currently attached to this group.