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Network Address Translation Traversal

This section describes the Network Address Translation (NAT) Traversal

feature as it effects IP Phones. NAT Traversal is required to permit IP

Phones working behind a NAT box to connect and maintain signaling and

media paths.

NAT Traversal is applicable to all UNIStim IP Phone clients and is

one-ended. That is, it does not require the other end of a call to support

any special protocol, and it is interoperable with any other media

termination.

In this document NAT refers to both IP port address mapping and IP

address mapping (also known as NAPT). A NAT is used with or without a

Virtual Private Network (VPN).

The NAT Traversal feature supports only IP clients behind cone NAT

types. Three types of cone NAT are: full cone, restricted cone, and port

restricted cone. NAT traversal is not compatible with symmetric NATs. If

the IP Phone is behind a Symmetric NAT, the LTPS unregisters the phone

from the call server (while remaining registered on the LTPS), and displays

the following message on the IP Phone display:

Error! Symmetric NAT.

For detailed information about the NAT Traversal feature, see Signaling

Server IP Line Applications Fundamentals (NN43001-125).

For information about accessing NAT information from an IP Phone, see

“Set IP Information” (page 596).

ATTENTION

Nortel recommends partial DHCP configuration for IP Phones residing behind

a NAT router unless the NAT router supports special configuration of the

DHCP server. For more information, see Signaling Server IP Line Applications

Fundamentals (NN43001-125).

General Information

The General Information menu displays information about the IP Phone.

To access the General Information menu, press Services > Telephone

Options > Set Information > General Information.

The General Information menu displays the following information about

the IP Phone

• Hardware ID

• Terminal Type

• Release Number

• Manufacturer Code

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010