Nortel VoIP Gateway, Configuration Manual

Page: 44 / 220

44 Configuring the Number Manipulation tables
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Configuring the Number Manipulation tables
The VoIP Gateway provides Number Manipulation tables for incoming and outgoing calls. These
tables are used to modify the destination and source telephone numbers so that the calls can be
routed properly.
The VoIP Gateway has four number Manipulation tables.
• “Configuring number manipulation for Destination Phone Numbers for Norstar to IP calls” on
page 46
• “Configuring number manipulation for Digit Delivery” on page 49
• “Configuring number manipulation for Source Phone Numbers for IP to Norstar calls” on
page 52
• “Configuring number manipulation for Source Phone Numbers for Norstar to IP calls” on
page 55
Number Manipulation overview
The Norstar VoIP Gateway contains a number of very powerful and useful utilities for the
manipulation of source and destination telephone numbers used on a call by call basis.
Understanding how the manipulation works and what circumstances would need digit
manipulation is key to setting up the overall network dialing plan.
Basic Concepts
The VoIP Gateway uses four manipulation tables:
• IP -> Tel Source Numbers
• Tel -> IP Source Numbers
• Tel -> IP Destination Numbers
• Digit Delivery (IP -> Tel Destination Numbers)
In addition, similar tables are used for routing decisions in the VoIP Gateway:
• Tel -> IP Routing table
• IP -> Hunt Group Routing table.
These routing tables do not use any manipulation features but simply allow calls to be directed
properly, as determined by the dialed digits.
Each of these will be explained further in sections to follow. Each manipulation table utilizes the
same basic set of rules.
Note:
Number manipulation can occur either before or after a routing decision is made.
To control when number manipulation is done, set the IP to Tel Routing Mode and the
Tel to IP Routing Mode parameters. For information about these parameters, refer the
description of these parameters on
Table 4 on page 30 .