We have Avaya handsets in the office and need to know how to change the numbers in the office as some extension numbers are ringing the same number so they need reprogramming! We have a user manual but cant seem to find anything in there to do this? Also one of the phones messages light is on constantly even though there is no message waiting and it deletes the message straight after you've listened to it, is there anyway of stopping the phone from doing this? Any help would be greatly appreciated. Many thanks