Security Guidelines
13-280132 Rev. Q
Page 49
S
S
p
p
e
e
c
c
i
i
a
a
l
l
C
C
h
h
a
a
r
r
a
a
c
c
t
t
e
e
r
r
s
s
{ }
(left & right brace/curly brace/curly bracket, ASCII 123 & 125
)
encloses prefix and suffix operations
^
(circumflex accent/caret/hat, ASCII 94)
wildcard, matches any dialed digit
|
(vertical bar/vertical line, ASCII 124
)
separates components
in a prefix or suffix, indicates a substitution; characters to the left of the | are
replaced by characters to the right
`
(grave accent/acute accent/backquote, ASCII 96)
in a dial string, instructs the phone to produce a secondary dial tone
in a suffix, indicates a meta operation
E
E
x
x
a
a
m
m
p
p
l
l
e
e
s
s
The following is a sample of a dial plan with a single “component”. The following dial plan
will cause the phone to automatically initiate a call when the user dials “911”. Also, at the
time of call initiation, the phone replaces “911” with “2584357”. You will notice that there
are “|” characters which are not acting to separate components, but are part of the prefix
and suffix operations.
<dial_plan>{
911
|
2584357
}
911#
{|}</dial_plan>
The components in the above dial plan can be broken down as follows:
{
911|2584357
}
This is a “prefix operation” and is enclosed within the
{}
. The bar in the
prefix operation tells the phone that if the digits in front of the bar are dialed at the
beginning of the string, they are to be replaced with the digits after the bar.
911#
This is the dial string. If the digits dialed match this string, the phone performs the
prefix and suffix operations defined in this component. If the “
#
” occurs at the end of the
dial string, it tells the phone to initiate a call after receiving digits which match those
defined in the dial string.
Valid characters for the dial string are:
A-Z a-z 0-9 . @ _ - / \, : ; * ‘ “ ( ) < > ~ + = ? ! $ % &
(space)
{|}
This is a “suffix operation” and is enclosed within the
{}
. The bar in the suffix
operation tells the phone that if the digits in front of the bar are dialed as the last digits in
the dialed string, they are to be replaced with the digits after the bar. Since there are no
values entered, no operation is performed.
Another single component dial plan is shown below. This dial plan automatically initiates
the call after seven characters, if the dialed string begins with a 3, 4, 5, or 9. Also, at the
time of call initiation, the prefix “1425” is added to the beginning of the number.
<dial_plan>{|
1425
}[
3-5,9
]^^^^^^
#
{|}</dial_plan>
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