thanks Sabirawa for the replay , I know how to delete the call log manually from the phone , but my question is related to 2007 ip phone used in the hotel as a guest phone, in which we use the HMS400 for check in / out, and as you know by check out all record and messages for this room will be deleted except the call log, it remain on the phone which will bother the next guest when he see the missed call or caller list ... ?? so is there away how to delete it automatically after the check out ???