Section 1 Napt - NEC Univerge SV9100 Manual

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SV9100 Networking Manual

Introduction

NAPT, or Network Address Port Translation, is a method by which a private

address, or addresses, and their TCP/UDP ports are translated into a single

public address and its TCP/UDP ports. In the case of DT800/DT700 IP phones

with the SV9100, it allows their connection to a public (Internet) IP address which

is then converted back to the private (non-Internet) IP address on the customers

network. The translation is available at the SV9100 end as well as at the remote

IP Phone end of the connection if required. The feature is NOT available for IP-

CCIS and Netlink connections.

The router that the SV9100 resides behind still requires Port Forwarding

statements. However the router that the IP terminal/terminals reside behind may

not require any port forwarding.

Due to the fact that there are many manufacturers producing routers there may

still be times when port forwarding is required.

This feature is only effective when PRG 15-05-45 set to a "1" (ON).

In all software versions, SIP ALG's (Application Level Gateway) or other SIP

Applications MUST be disabled in all routers. If a SIP ALG or a similar SIP

application is enabled, IP phone service WILL be interrupted.