Nortel VoIP Gateway, Configuration Manual

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Configuring the Number Manipulation tables 45
Norstar VoIP Gateway Configuration Guide
Digit parsing
In order to determine whether or not a particular call requires digit manipulation or routing, the
number (source or destination) is parsed to see if it matches the digit rule in the table (Dialed
number, Source Number, Prefix). Digit parsing options include:
• Digits: Numerals from 0 – 9.
• Wild card: * means any number of digits of any type
• Don’t Care: X means any single digit of any type
• Terminator: # indicates the end of the digit string (no digits follow)
• Range: [x - y] indicates the range of numbers from x to y inclusive
• Range: [x,y,z] indicates the value may be any of the indicate list
For example:
• [5551200 – 5551300] represents all of the numbers from 5551200 to 5551300 inclusive.
• [3,4,5]xxx# would be a 4 digit number beginning in either 3, 4 or 5.
• 123[100 -200]* would be numbers that start with 123100 to 123200 inclusive.
Number Classification – NPI / TON
In the tables that provide manipulation from Tel -> IP, you may specify the NPI / TON to be used
in the H.323 message coding. This classification is important in some gatekeepers (Radvision) in
order to provide address resolution. The NPI / TON used in your setup message must be the same
as that used in registration by the destination gateway.
NPI / TON is a term originally used with Q.931 which is the basis for H.323. Choices for
Numbering Plan Indicator (NPI) are:
• Unknown
• Private
• Public (e164)
Public is chosen if the number is part of the PSTN numbering plan that is used for national dialing.
Private is used to represent a numbering plan that is used in a private voice network.
For more information on Numbering and Dial Plans, refer to Appendix A, “Numbering and Dial
Plans,” on page 147 .
Stripping and adding digits
The tables provide the ability to strip leading digits from the digit string (number of stripped digits)
and to add new leading digits (prefix to add).