Nortel VoIP Gateway, Configuration Manual, Page: 41 / 220

Configuring the Registration Prefixes 41
Norstar VoIP Gateway Configuration Guide
Configuring the Registration Prefixes
The Gatekeeper Registration Prefix Table allows you to associate dialing plan information with
specific digit prefixes.
Gatekeepers can route calls based on two pieces of information: destination digits and numbering
plan. The ability to route by numbering plan is useful when Gatekeepers must route both private
and public calls. For example, company A has an internal private network with private access
codes. These codes are 7 digit numbers comprising a location code and an internal DN. A code of
395-3491 also looks like a valid local public number. The numbering plan information allows the
Gatekeeper to route the apparently ambiguous destination digits that could be dialed on both a
private and public network. For example, a digit string of 395-3491 with a numbering plan of
E.164 Public / National is routed to the destination IP address of a gateway that interfaces with the
PSTN. The same digit string with a numbering plan of Private / Level1 Regional is routed to the IP
address of a gateway on the private network.
The Gatekeeper Registration Prefix Table data is sent when the gateway requests permission to
register with the Gatekeeper. This registration request is triggered by a gateway reset.
If there are no entries in the Registration Prefix Table, then the VoIP Gateway registers with the
Gatekeeper using the numbers defined on the Channels - Hunt Group screen and the NPI / TON
selected in the Gateway Registration Type parameter on the Protocol Definition screen.
Using a Radvision ECS 3.0 Gatekeeper
The Norstar VoIP Gateway works with the Radvision ECS 3.0 Gatekeeper. The Radvision
Gatekeeper uses both the destination digits and the numbering plan information (NPI/TON) to
resolve a called number into an IP address for the destination. If you are using a Radvision
Gatekeeper, we recommend that you configure the Registration Prefix Table to guarantee
maximum flexibility.
Using a Nortel Networks CSE1000 Gatekeeper
The Norstar VoIP Gateway works with the Nortel Networks CSE1000 Gatekeeper. The CSE1000
Gatekeeper is manually administered to set up its dialing plan and does not require the use of the
Gatekeeper Registration Prefixes Table.
The CSE1000 Gatekeeper is setup based on the H323-ID. The H323-ID is a unique text string used
to represent the gateway. When using the CSE1000 Gatekeeper, select H323-ID as the Gateway
Registration Type.
To configure the Gatekeeper Registration Prefixes parameters:
1 Access the web interface.
2
Click the Protocol Management button.