3com SuperStack 3 NBX Manual De Usuario

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PPENDIX

 D: C

ONNE

X

TIONS

 H.323 G

ATEWAY

ConneXtions is a 3Com software product that allows you to use an 
appropriately configured Windows system as an H.323 gateway for use 
with NBX systems.

H.323 gateways implement an ITU standard that allows telephone-like 
call connections to occur through an IP network. Although this standard 
addresses the means for transferring data, voice, and images, the NBX 
ConneXtions H.323 Gateway focuses on delivering low-cost, high-quality, 
voice connections through IP networks.

The ConneXtions software adapts internal NBX system protocols to 
equivalent H.323 protocols that are carried across a WAN in IP packets. 
The H.323 protocol addresses:

■

Negotiated connections.

■

Negotiated voice compression.

■

Standard extensions.

■

Remote Internet device connections.

For more information, see 

 on 

The ConneXtions H.323 Gateway software requires an NBX system and 
at least four additional components:

■

A router with access to a wide area network (WAN)

■

A Windows-based server connected to the NBX LAN

■

ConneXtions software (on the NBX Resource Pack CD)

■

A ConneXtions license

WAN Routers typically connect to ISDN, T1, E1, Frame Relay, or 
Asynchronous Transfer Mode facilities, depending on the load they carry.

A dedicated router can often reduce problems encountered with 
firewalls. Firewalls often interfere with connections because they are 
designed to admit only authorized addresses, and because they 
discriminate against specific types of packets. The unusual complexity of