What does a period accomplish when it is used in a SIP Dial Rule pattern that is associated with a
Cisco 9971 IP Phone that is registered to Cisco Unified Communications Manager?

A.
It matches any single digit from 0 to 9.

B.
It matches one or more digits from 0 to 9.

C.
It is a delimiter and has no significant dialing impact.

D.
It matches any single digit from 0 to 9, or the asterisk (*) or pound (#) symbols.

E.
It matches one or more digits from 0 to 9, or the asterisk (*) or pound (#) symbols.

Explanation:
Asterisk (*) matches one or more characters. The * gets processed as a wildcard
character. You can override this by preceding the * with a backward slash (\) escape sequence,
which results in the sequence \*. The phone automatically strips the \, so it does not appear in the
outgoing dial string. When * is received as a dial digit, it gets matched by the wildcard characters *
and period (.).