430 APPENDIX D: CONNE XTIONS H.323 GATEWAYTo perform a gateway loopback test:1 Access a ConneXtions H.323 port from an NBX Business or BasicTelephone by dialing an H.323 port line number or by using a dial planconfigured with a ConneXtions pool number.You must have Super User Group CoS allowed to dial in to a line portnumber directly.2 Enter the IP address of the gateway.3 Verify the connection. If you are using default settings, you are connectedto the Auto Attendant. If you are not using default settings, you may beconnected to a different extension number.Local ConsiderationsAll voice packets that move between an NBX Business or Basic Telephone,Call Processor, ConneXtions gateway, and router on the LAN have a highpriority and high quality of service.However, at the router and beyond, network administrators can influenceH.323 call quality through the priority that they give to H.323 packets atboth the internet router and at the firewall.If H.323 connectionsconsistently experience significant delays, you should review the localrouter and firewall configurations at each side of the H.323 connection.Network Checks A network check uses:■ Network Ping■ NetMeeting ConnectionsNetwork PingA network ping is a packet transfer that checks the logical continuitybetween a personal computer and a specified IP (router) address. Forexample, you can ping your own address, or the default gateway. Thenext ping checks the connection to the IP router at the remote end of theintended H.323 connection.The easiest way to initiate a ping is with a DOS ping command. Thiscommand sends four pings to the specified IP address. The router at thataddress immediately returns the ping, and the command notes the roundtrip delay for each ping packet. Some firewalls do not return pings forsecurity reasons. If the ping test fails, you can use a “trace router”command (“tracert”) to find out where the logical connection failed.
