To stop handsets going into discover mode in the 46xxsettings.txt change;
SET UNNAMEDSTAT 0
And reboot your handsets
################################################## ##########
## ##
## H.323 SETTINGS ##
## Settings specific to telephones with H.323 software ##
## ##
################################################## ##########
## Unnamed Registration Status
## Specifies whether unnamed registration is initiated if
## a user fails to enter a value at the Extension prompt.
## Unnamed registration provides the telephone with
## TTI-level service, enabling a user, for example, to
## dial emergency services such as 911.
## SET UNNAMEDSTAT 0
theavayengineer.wordpress.com 
this had been a problem for us since the move to IP phones. I just tested this and it worked like a charm.. thank so much.
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I tend to disagree with the statement made. Unnamed Stat is enabling users to make emergency calls when not logged into the phone with a physical extension and password.
Phones will only go into discovery mode if it cannot see the Gateway or Clan card it needs to register to, or it cannot find the DHCP helper address on the data switch that it is connected to in order to get an IP address and the 46xxsettings.txt file location from SSON 242 on the DHCP server
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Thanks for your comments Giel, from what I remember in this case despite putting the IP address range in CM for these handset, when logged out they would still time out and go into discovery mode along with the annoying beep this was the only way we could get round it at the time.
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