Napt Traversal - NEC UNIVERGE SV9100 Features And Specifications

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NAPT Traversal

NAPT (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. The NAPT

feature gives the SV9100 the ability to "traverse" its own subnet. With NAPT, the network administrator

can place the GCD-CP10 and the GPZ-IPLE (VoIPDB) in the customers LAN while still making it

accessible to users outside the local LAN. The NAPT Feature also allows the IP terminals to be placed

in a local LAN in a remote network and be able to communicate back to the SV9100.

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. This feature is

only available when using a GPZ-IPLE. Due to the fact that there are many manufacturers producing

routers there may still be times when port forwarding is required.

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.

The NAPT feature is only effective when Program15-05-45 is set "1" (On). Refer to Example – NAT

Traversal or an examples of the NAT Traversal network. Example – Required System Settings and

Example – Required IP Terminal Settings on examples of required system and IP terminal settings. Refer

to Example – SV9100 System Router A Port Forwarding Settingsfor Port Forwarding setting examples.

Actual input data should be set according to the required system.

Example – NAT Traversal