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Which of the following dial peers will the router use?

You issue the showrunning config command on a CME router and receive the following partial output:

A caller dials 3021234.
Which of the following dial peers will the router use? (Select the best answer.)

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A.
1

B.
2

C.
3

D.
4

Explanation:
The Cisco Unified Communications Manager Express (CME) router will use dial peer 4 to route the voice data
when a caller dials 3021234. When a caller dials 3021234, the router collects the digits as the caller dials them.
The router compares the dialed digits against dial peer destination patterns on a digitbydigit basis. Because dial
peer 4 most specifically matches the dialed string 302, the router will immediately process the call by using dial
peer 4 as soon as the caller completes the 302 sequence of characters.
If multiple dial peers explicitly match the destination pattern, the most specific match for the pattern will be
used. For example, if dial peer 4 were removed from this scenario, a caller dialing 3021234 would immediately
match all three of the remaining dial peers. Dial peer 3, because it explicitly defines the dialed string, would be
the most specific match. Dial peer 1, because its destination pattern contains seven wildcards, would be the
least specific match.
The router will not use dial peer 3 to route the voice data when a caller dials 3021234. Although dial peer 3 is
the most specific destination pattern match for the entire string of dialed digits, the router will process the most
specific match on a digitbydigit basis. Therefore, the router will process the call as soon as dial peer 4 is
matched, before the caller has had a chance to complete the full sevendigit string.
The router will not use dial peer 1 or dial peer 2 to route the voice data when a caller dials 3021234. Although
the destination pattern configured for dial peer 1 would match any sevendigit dialed string, the destination
pattern is not the most specific match for 3021234. Similarly, the destination pattern configured for dial peer 2
would match the dialed string, but it is a less specific match than dial peer 4, because four of the seven digits in
the dial peer 2 destinationpattern command are wildcards.

https://www.cisco.com/c/en/us/support/docs/voice/call-routing-dial-plans/14074-in-dial-peer-match.html#topic9

3 Comments on “Which of the following dial peers will the router use?

  1. Vincent says:

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  2. Vincent says:

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