D-Link DPH-400S User Manual page 62

Enable Enable Password Dial by selecting it, When number entered is
Password beginning with the password prefix, the following N numbers
Dial after the password prefix will be hidden as *, N stand for the
value which you enter in the Password Length field. For
example: you set the password prefix is 3, enter
the Password Length is 2, then you enter the number 34567, it
will display 3**67 on the phone.
Password Specify the prefix of the password call number.
Dial Prefix
Password Specify the Password length.
Length
DND Return Specify DND Return code.
Code
Busy Return Specify Busy Return Code.
Code
Reject Specify Reject Return Code.
Return Code
Hide DTMF Specify the hide DTMF mode.
Push XML Specify the Push XML Server, when phone receives request, it
Server will determine whether to display corresponding content on the
phone which sent by the specified server or not.
Set Prefix in peer to peer IP call. For example: what you want
P2P IP Prefix to dial is 192.168.1.119, If you define P2P IP Prefix as
192.168.1., you dial only #119 to reach 192.168.1.119. Default
is ".". If there is no "." Set, it means to disable dialing IP.
Active URI Specify the server IP that remote control phone for
Limit IP corresponding operation.
Action URL
Settings
Action URL Specify the Action URL that Record the operation of phone,
Settings
send these corresponding information to server, url：
http://InternalServer /FileName.xml?（InternalServer is server
ip， FileName is name of xml that contains the action message ）
Block Out
Settings
Set Add/Delete Limit List. Please input the prefix of those
phone numbers which you forbid the phone to dial out. For
example, if you want to forbid those phones of 001 as prefix to
be dialed out, you need input 001 in the blank of limit list, and
Block out then you cannot dial out any phone number whose prefix is
001.