434 APPENDIX D: CONNE XTIONS H.323 GATEWAYc Select Network or Direct Call, after using.d Click Call.e Confirm the connection using a speaker or headset and microphone.9 To end the call, click the “hang-up” icon.Interpreting the ResultsThe NetMeeting check has three possible outcomes:■ No communication with remote NetMeeting.Wrong IP address.Firewall is blocking call setup (TCP) packets.■ Call rings remote end and it answers, but there is no audio.Faulty connection to a microphone, speaker or both.Firewall is blocking audio (UDP) packets.■ Calls work in one direction, but not in the reverse direction. Place acall to determine which firewall is blocking TCP traffic. Once youdetermine this, it is the remote firewall that is blocking the traffic.Placing Calls You can place an outgoing H.323 call from an NBX system in one ofseveral ways, as discussed in this section.See Chapter 2 for information on how to use the dial plan to set up theNBX system to use H.323 ports.IP Address Entry Depending on how you set up the dial plan, the most convenient way toplace a call to a new number is to dial a ConneXtions extension list(configured within the dial plan), which provides a connection to anavailable H.323 port. If a port is available (not busy), enter the extensionand IP address from the telephone key pad. Use the * key to separatethe four “octets” in the IP address, and then press the # key to “dialnow.”
