What is the Question Mark Wildcard in a SIP Trigger? - Exam 400-051: CCIE Collaboration

C.

In Cisco Unity Express, a SIP trigger is used to initiate various actions based on certain conditions, such as incoming calls. The question mark wildcard character "?" is used in SIP trigger patterns to match any single character or digit.

Option A states that the question mark wildcard character matches any single digit in the range of 0 through 9. This statement is incorrect, as the question mark wildcard character only matches a single character, not a range of characters.

Option B states that the question mark wildcard character matches one or more digits in the range of 0 through 9. This statement is incorrect, as the question mark wildcard character only matches a single character, not multiple characters.

Option C states that the question mark wildcard character matches zero or more occurrences of the preceding digit or wildcard value. This statement is incorrect, as the asterisk (*) wildcard character is used in Cisco Unity Express to match zero or more occurrences of the preceding digit or character.

Option D states that the question mark wildcard character matches one or more occurrences of the preceding digit or wildcard value. This statement is incorrect, as the plus (+) wildcard character is used in Cisco Unity Express to match one or more occurrences of the preceding digit or character.

Option E states that the question mark wildcard character matches any single digit in the range of 0 through 9 when used within square brackets. This statement is also incorrect, as square brackets are used in Cisco Unity Express to match any single character within the specified range, not just digits.

Therefore, the correct answer is none of the above. The question mark wildcard character matches any single character or digit in a SIP trigger pattern on Cisco Unity Express.