3Com Nbx 100 And Ss3 Nbx Administration Guide
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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 representative. WARNING:There is a danger of explosion if the battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions. Getting Service and SupportYour authorized 3Com NBX Voice Authorized Partner can assist you with all of your support needs, including systems and cable plant design, installation, configuration, and project management. A choice of maintenance services, including remote diagnostics, on-site support, telephone technical support, and hardware replacement, is available from your 3Com NBX Voice Authorized Partner. Training and enhancement services are also available. Table 77 Terminal Emulation Program Properties PropertyValue EmulationVT100 Baud Rate9600 Data bits8 ParityNone Stop bits1 Flow controlNone
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 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 “Overview of H.323” later in this appendix. Installation RequirementsThe 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 Resource Pack CD) ■A ConneXtions license Systems that receive H.323 calls through the public Internet may also need a firewall. See “Firewall Security” later in this appendix. WAN RouterWAN 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
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. However, you should implement this solution only if it is consistent with your company’s network security policy. For more information, see “Firewall Security” later in this appendix. Windows-based SystemThe ConneXtions software requires a dedicated computer system that is running Windows NT version 4.0 with service pack 4 (or higher), or Windows 2000. The system hardware must be certified by Microsoft. The installation software checks for the presence of Windows 2000 or Windows NT then loads the correct NBX packet driver from the ConneXtions disk. Although the ConneXtions software requires little disk storage, processing and memory requirements are critical, and you may need multiple gateways. Microsoft server licenses do not apply because no additional operating system logons are involved. The main considerations are Windows Compatibility and Processor, Memory, and Bandwidth Requirements, discussed next, and Firewall Security, discussed later in this appendix. Windows Compatibility To check the compatibility of your system: 1On a computer that has Internet access, enter www.microsoft.com/hwdq/hwtest . 2Locate the link to the Hardware Compatibility List. 3Verify that your intended Windows 2000 or Windows NT system is on the Hardware Compatibility List.
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 speed and bandwidth requirements for different numbers of ports. It assumes that each packet carries a 50-byte overhead. The memory requirements to support port processing also increase with each new port. A fully configured system, with the maximum number of ports (100), needs 600 Mb of main memory. Hard disk requirements are less than 40 Mb. Table 78 Pentium Processor Capabilities Pentium II Speed (MHz)Pentium III Speed (MHz)Bandwidth (Kbps) on the LAN PortsG.711G.723G.711G.723G.711G.723 210025640150153.638.4 420051280300307.276.8 84001000160600614.4153.6 16800200032012001228.8307.2 321600400064024002457.6614.4 64320010000128048004915.21228.8 1005000128002000750076801920
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 result. Other System Requirements Each H.323 port requires 6 Mb of memory. 3Com recommends a PC with at least 128 Mb of memory. Disk storage requirements are minimal. In addition to memory and disk storage, the operating system needs: ■A compact disk for loading ConneXtions software. ■A 3Com Network Interface Card for connecting to the NBX LAN (10BASE-T or 100BASE-T). ■A 3Com Network Interface Card for connecting to a separate firewall or router (optional). The Call Processor coordinates its activities with the gateway through a Network Interface Card (NIC) in that gateway system. The same NIC Table 79 Pentium II and III Processor Capabilities Pentium II PortsPentium IIIPorts (MHz)G.711G.723(MHz)G.711G.723 30062450226 40083500256 500104533267 600124550277 650135600308 Dual 500208650328 667338 700359 733369 7503710 8004010 15007420
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 PSTN line ports. Both have extensions and are configured the same way. The only difference is their license requirements. The NBX Resource Pack CD is also required to change H.323 gateway parameters after installation. A dealer who wants to explore possible hardware incompatibilities by running ConneXtions from a substitute laptop must reinstall ConneXtions on the laptop at each site. Preparing for InstallationBefore you install a ConneXtions H.323 Gateway: ■Assemble system information. ■Check for the G.723 convertor (optional). ■Verify and install the NT Service Pack (Service Pack 4) (if required). ■Assemble permissions, licenses, and notifications. Do not uninstall the current version. You would remove the current settings Assembling System InformationConneXtions is installed through an InstallShield wizard. It presents a series of dialog boxes that request specific permissions and configuration information. Assemble this information before you begin an installation: ■NBX administrator login name: ■NBX administrator password: ■NBX H.323 software and associated port licenses. ■Caller ID label for outgoing calls. The default is the caller’s extension. Use the main office telephone number (10 digits in the United States). ■NBX system name. Supply the name that H.323 callers see when they connect to the Auto Attendant. ■The TCP or UDP port ranges for use with a firewall, if any.
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 from the Microsoft web site. Checking Service Pack (Windows NT Only)If you are using Windows NT 4.0 to run the ConneXtions software, you require Service Pack 4 (or higher). To verify that you are running Service Pack 4: 1On the Start menu, select Programs > Administrative Tools (Common). 2Select Windows NT Diagnostics, and click the Ve rsio n tab. 3Verify that the NT version is 4.0 with Service Pack 4 or later. If it is not, download the latest version from the Microsoft web site. Configuring LicensesTo configure licenses, you must enter system information, such as the number of H.323 ports that you want to install. You can find this information through the NBX NetSet utility. You can purchase licensed keycodes to unlock additional ports. A license provides a software key that unlocks ports that are already loaded. You can purchase licenses to enable or upgrade a system to 1, 2, 4, 8, or 16 ports on an NBX 100 system, or to 1, 2, 4, 8, 16, 32, 64 or 100 ports on a SuperStack 3 system. Software keys are tied to the system serial number. To configure licenses: 1Log in to the NBX NetSet utility: aOpen your browser and connect to the Call Processor by using its IP address (example: 192.168.1.190) or host name (example: Home). bClick Administrator. cEnter your username and password. dClick OK.
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 the number of licenses for the H.323 Gateway. eClick Add License. fEnter the License Key (must be purchased) to unlock the license. To obtain a license key, contact 3Com order management or your supplier. gClick OK. Do NOT click Apply. If you click Apply and then OK, the system warns you that you have an invalid license. 4Specify Auto Discovery: aReturn to the NBX NetSet - Main Menu window. bClick System Configuration. cOn the System Settings tab, click System Wide. dCheck Auto Discover Line Cards. eClick OK.