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Placing Calls 421
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
*
273#
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.”
The # sign also precedes the extension as shown below. This allows the
ConneXtions gateway to complete the IP connection before it presents
the remaining digits to the remote terminal:
8192
*
168
*
1
*
15#273
Both configurations produce the same result when dialing into another
NBX system; however, other PBXs can be position-sensitive. If you are not
sure, use the first format with the # sign after the extension.
Speed Dials Your telephone system has a speed dial capability that offers a quick way
to dial frequently called numbers. Each telephone is capable of accessing
199 previously stored dial sequences with up to 30 characters in each
sequence. These sequences can represent switched network numbers or
Internet addresses. Special 3-digit speed dial numbers specify each dial
sequence.
Speed dial numbers must be preceded by the “Feature” button when
entered from a telephone. This button distinguishes NBX speed dial
numbers from ordinary extensions that use the same three digits.