3Com Nbx 100 And Ss3 Nbx Administration Guide

Servicing the Network Call Processor Battery411
All messages that associated with the board (for example, the 
initialization process) appear in the terminal emulation window.
Servicing the 
Network Call 
Processor BatteryIf you lose the system date and time when you reboot the 
SuperStack 3 NBX system, it could mean that the Call Processor battery 
must be replaced. The battery is not a user-serviceable item. If you 
suspect a problem with the battery, contact your 3Com Technical Support...

412CHAPTER 10: TROUBLESHOOTING 

A
CONNEXTIONS H.323 GATEWAY
This appendix provides information on the 3Com ConneXtions H.323 
Gateway in these sections:
■Overview of ConneXtions
■Installation Requirements
■Preparing for Installation
■Installing ConneXtions
■Overview of H.323
■The H.323 Connection
■Connection Considerations
■Special Issues
■Checking Connections
■Placing Calls
■Receiving Calls
■Handling Conference Calls
■Related H.323 Documentation 

414APPENDIX A: CONNEXTIONS H.323 GATEWAY
Overview of 
ConneXtionsConneXtions 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...

Installation Requirements415
the H.323 protocol presents special problems for firewalls because it 
requires additional processing. To minimize packet delay through a 
firewall, verify that the firewall is configured to give H.323 packets a high 
processing priority.
During installation, you can select a range of TCP or UDP ports to use 
with H.323 connections to provide more flexibility when using firewalls.
A ConneXtions gateway can use a separate network interface card to 
bypass the firewall delay....

416APPENDIX A: CONNEXTIONS H.323 GATEWAY
Processor, Memory, and Bandwidth Requirements
Each G.711 call needs about 50 MHz on a Pentium II or 20 Mhz on a 
Pentium III. Each G.723 call needs about 128 MHz on a Pentium II or 75 
Mhz on a Pentium III. These speed requirements increase directly with the 
number of ports. The IP router bandwidth requirements also increase 
directly with the number of ports.
The bandwidth requirements for a Pentium II and a Pentium III are 
identical.
Ta b l e 7 8
 shows the...

Installation Requirements417
Ta b l e 7 9 lists the theoretical maximum number of ports that typical 
Pentium processors can handle.
 
The maximum number of ports can be limited by the number of licenses.
If your port processing requirements exceed the capacity of a single 
processor, ConneXtions software supports either multi-processor (dual 
and quad Pentium processors) or multiple gateway solutions. A Windows 
2000 or Windows NT system that uses a dual 800 MHz Pentium 
processor achieves the same...

418APPENDIX A: CONNEXTIONS H.323 GATEWAY
can also be used to communicate with the IP router. This single NIC 
configuration is appropriate if the firewall, which separates Internet 
and intranet, is either unnecessary or is required by company policy.
ConneXtions
SoftwareYou use the NBX Resource Pack CD to install ConneXtions software. The 
ConneXtions software performs the protocol conversions between an 
NBX system and the international H.323 standards. To a system 
administrator, H.323 ports look like...

Preparing for Installation419
Verifying the
G.723 ConverterInstallations that need G.723.1 audio compression require access to a 
converter in Microsoft NetMeeting 2.1 or 3.01. NetMeeting must be 
installed on the same PC that holds the ConneXtions software, but the 
two cannot run simultaneously.
G.723.1 does not appear as a selectable option in ConneXtions unless the 
converter is accessible.
To confirm that the convertor is present, search for the msg723.acm
 file 
on your hard drive or download it...

420APPENDIX A: CONNEXTIONS H.323 GATEWAY
2Access and record the Call Processor MAC address:
aIn the NBX NetSet - Main Menu window, click Reports.
bClick the System Data tab.
cRecord the MAC address.
MAC addresses use colons as separators. Take care to record the Call 
Processor MAC Address, not the Music-on-Hold MAC address, which also 
appears in the System Data tab.
3Determine the number of port licenses:
aReturn to the NBX NetSet - Main Menu window.
bClick Operations.
cClick the Licenses tab.
dRecord...