3Com NBX 100 Administrator's Manual page 435

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.
Extension Lists
You can configure H.323 ports for single-digit access (usually 8) instead of
a specific 3-digit line extension. The single-digit access allows the NBX
system to select an available line port when you place an external call.
Internet IP line ports and CO (central office) line ports must never be
assigned to the same extension list because they use very different dial
plans. Conventional practice is to use 9 for external switched network
(PSTN) connections and 8 for external IP network connections.
Calls to other NBX systems (or PBX systems) can include a destination
extension. This example represents a call to an extension (273) on a
remote NBX system that has an H.323 ConneXtions gateway:
8192 168 1 15
* * * *
The # sign tells ConneXtions to "dial now." The last asterisk,
terminates the IP address, but ConneXtions cannot dial the number until
it sees the "# sign," or until 4 seconds pass after the last digit. In the
preceding example, the IP address (192.168.1.15) and the extension are
presented to the device as the "called party."
273#
Placing Calls 435
,
*