Refer to the exhibit. To reach an external number, a user first dials a 9. Which route pattern will be matched if a user dials the toll-free number 18005550123?

The correct answer is D. 9.1800XXXXXXX. The user dials 9 + 18005550123, making the full dialed string 918005550123, which CUCM represents as 9.18005550123 in route pattern notation. CUCM uses a longest/most-specific match algorithm. Pattern D (9.1800XXXXXXX) explicitly matches: 9 + 1 + 800 (literal) + 7 wildcard digits

Gateway and Dial Plan

Question

Refer to the exhibit. To reach an external number, a user first dials a 9. Which route pattern will be matched if a user dials the toll-free number 18005550123?

Options

A911
B9.[2-9]XXXXXX
C9.1[2-9]XX[2-9]XXXXXX
D9.1800XXXXXXX
E9.1866XXXXXXX
F9.1877XXXXXXX
G9.1888XXXXXXX
H9.1900XXXXXXX
I9011!

How the community answered

(45 responses)

C
2% (1)
D
76% (34)
E
2% (1)
F
13% (6)
G
7% (3)

Explanation

The user dials 9 + 18005550123, making the full dialed string 918005550123, which CUCM represents as 9.18005550123 in route pattern notation. CUCM uses a longest/most-specific match algorithm. Pattern D (9.1800XXXXXXX) explicitly matches: 9 + 1 + 800 (literal) + 7 wildcard digits = 9.18005550123. Pattern C (9.1[2-9]XX[2-9]XXXXXX) would also technically match since 8 is in [2-9] and 5 is in [2-9], but pattern D is more specific because it uses literal characters (1800) rather than wildcard ranges, making it a longer/more exact match. CUCM always selects the most specific matching pattern, so D wins over C. The other 1800/1866/1877/1888 patterns do not match because the literal prefix (800) does not equal 866, 877, or 888.

Topics

#route pattern matching#toll-free numbers#dial plan#pattern specificity

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