Information Technology Reference
In-Depth Information
Note: Notice that dial-peer tag 2000 is used on the CME_A router for a VoIP dial peer
and used on the ROUTER_B router for a POTS dial peer. This combination works just fine.
The only restriction to keep in mind is that you cannot use the same dial peer tag value for
different functions on the same router.
Using Dial Peer Wildcards
As you saw in the previous few sections, configuring dial peers (and destination patterns)
without using wildcards would be extremely time consuming. By far, the most commonly
used wildcard is the dot (.), which represents any dialed digit. You will find a few other
wildcards useful in your configurations. Table 6-3 describes these wildcards.
Key
To p i c
Table 6-3
Wildcards You Can Use with the destination-pattern Command
Wildcard
Description
Period (.)
Matches any dialed digit from 0-9 or the * key on the telephone keypad. For
example, 20.. matches any number from 2000 through 2099.
Plus (+)
Matches one or more instances of the preceding digit. For example, 5+23
matches 5523, 55523, 555523, and so on. This trend continues up to 32 digits,
which is the maximum length of a dialable number.
Brackets
([])
Matches a range of digits. For example, [1-3]22 matches 122, 222, and 322. You
can include a caret (^) before the entered numbers to designate a “does not
match” range. For example, [^1-3]22 matches 022, 422, 522, 622, 722, 822, 922,
and *22.
T
Matches any number of dialed digits (from 0-32 digits).
Comma (,)
Inserts a 1-second pause between dialed digits.
Note: The pound symbol (#) on a telephone keypad is not a wildcard symbol. This key
immediately processes a dialed number when it is entered without waiting for additional
digits.
Tip: If you plan to create a dial peer using only the T wildcard as the destination pattern,
Cisco recommends that you create the destination as .T. This requires a user to dial at least
one digit to match the destination pattern. Otherwise, a phone left off-hook for too long
without a dialed digit will match the destination pattern.
Typically, the brackets wildcard is the most difficult to understand, primarily because it is
the most flexible. Table 6-4 shows a few examples of how it can be used.
 
 
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