From: 'anonymous' <sip: anonymous@anonymous.invalid> and
'privacy: id' header.
25.3 Manipulating Number Prefix
The device supports a notation for adding a prefix where part of the prefix is first extracted
from a user-defined location in the original destination or source number. This notation is
entered in the 'Prefix to Add' field in the Number Manipulation tables (see 'Configuring
Source/Destination Number Manipulation' on page 303): x[n,l]y...
where,
[n,l] = defines the location in the original destination or source number where the digits
y are added:
• n = location (number of digits counted from the left of the number) of a specific
string in the original destination or source number.
• l = number of digits that this string includes.
y = prefix to add at the specified location.
For example, assume that you want to manipulate an incoming IP call with destination
number +5492028888888 (area code 202 and phone number 8888888) to the number
0202158888888. To perform such a manipulation, the following configuration is required in
the Number Manipulation table:
1. The following notation is used in the 'Prefix to Add' field:
0[5,3]15
where,
• 0 is the number to add at the beginning of the original destination number.
• [5,3] denotes a string that is located after (and including) the fifth character (i.e.,
the first '2' in the example) of the original destination number, and its length being
three digits (i.e., the area code 202, in the example).
• 15 is the number to add immediately after the string denoted by [5,3] - in other
words, 15 is added after (i.e. to the right of) the digits 202.
2. The first seven digits from the left are removed from the original number, by entering
"7" in the 'Stripped Digits From Left' field.
Example of Configured Rule for Manipulating Prefix using Special Notation
Parameter Rule 1
Destination
Prefix
+5492028888888
Source Prefix
*
Source IP
Address
*
Stripped Digits
from Left
7
Prefix to Add
0[5,3]15
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