Glossary (N)

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NAT (NETWORK ADDRESS TRANSLATION)
NAT devices translate IP addresses so that users on a private network can see the public network, but public network users cannot see the private network users.

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NEIGHBOR GATEKEEPER
A mechanism by which a Gatekeeper optimizes inter-zone communication. A list of Neighbor Gatekeepers and their IP addresses allows the Gatekeeper to resolve destination IP addresses when the source endpoint is not in the same zone as the destination endpoint.

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NETWORK
A group of stations (computers, telephones, or other devices) connected by communications facilities for exchanging information. Connection can be permanent, via cable, or temporary, through telephone or other communications links. The transmission medium can be physical (fiber optic cable) or wireless.

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NSF (NETWORK SPECIFIC FACILITY)
The Network Specific Facility Information Element (NSF IE) feature enables system administrators to coordinate their network and service requirements with Service Providers.

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NUMBER PORTABILITY
Where the provision of numbers dialed is independent of home environment and/or serving network.

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