The asterisk (*) wildcard is used to match any sequence of characters, including an empty sequence. Therefore, it can be used to match any domain name in a SIP Route Pattern.
The other options are not correct because:
B. @: The @ symbol is used to separate the user name from the domain name in an email address.
C. !: The ! symbol is used to negate a character class.
D. .: The . symbol is used to match any single character.
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