420 APPENDIX D: CONNEXTIONS H.323 GATEWAY
■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 a
call to determine which firewall is blocking TCP traffic. Once you
determine 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 of
several ways, as discussed in this section.
See Chapter 2 for information on how to use the dial plan to set up the
NBX system to use H.323 ports.
IP Address Entry Depending on how you set up the dial plan, the most convenient way to
place a call to a new number is to dial a ConneXtions extension list
(configured within the dial plan), which provides a connection to an
available H.323 port. If a port is available (not busy), enter the extension
and IP address from the telephone key pad. Use the * key to separate
the four “octets” in the IP address, and then press the # key to “dial
now.”
You must configure the dial plan to use ConneXtions. You must have
Super User Group CoS privileges to perform this test.
These examples show key pad sequences that request an extension list
connection and a specific port connection:
8192*168*1*15#
where extension list access is used
OR
754 192*168*1*15#
if there is no extension list access, or if you want to test specific ports.
The first example begins with an 8 to request any available H.323 port.
The second example begins with the 3-digit extension (754) of a specific
H.323 port. The remaining digits in both examples represent the IP
address of the remote H.323 gateway (192.168.1.15). Note that IP
addresses are always four octets long. In this case, 15 is the last octet.