You are configuring a transform on a Cisco TelePresence VCS so that calls made by SIP and H.323 endpoints
use the same URI.Which of the following regular expressions could you use in order to match H.323 alphanumeric dial strings?
A.
(\\d+)
B.
([^@]*)
C.
(.+)@domain
D.
(\\d+)@domain
Explanation:
You could use the regular expression ([^@]*) in order to match H.323 alphanumeric dial strings. Regular
expressions are commonly used in transforms, which are used to modify dial string aliases. Each transform can
be set to match an exact string, a prefix, a suffix, or a regular expression, also known as a regex. If a match is
made, the alias is modified.
A transform with the type set to Regex will attempt to match the pattern based on regular expression
characters. The most common regular expression characters are listed in the following table:Unlike Session Initiation Protocol (SIP) dial strings, H.323 dial strings do not include @domain. You can use a
transform to search dial strings for the absence of the @ symbol and append @domain to those dial strings,
thereby ensuring that H.323 calls and SIP calls both use the same SIP Uniform Resource Identifier (URI).
The regular expression (\\d+) matches a dial string that contains only digits. Although this can be done in order
to add @domain to a numeric dial string, H.323 dial strings are alphanumeric.
The regular expression (.+)@domain matches a dial string that contains a string of characters plus @domain.
This expression can be used to match a SIP dial string.
The regular expression (\\d+)@domain matches a dial string that contains a string of digits plus @domain. This
expression can be used to match a SIP dial string only if the user name portion contains only digits.Cisco: Cisco TelePresence Video Communication Server Administrator Guide, Software version: X8.1:
Example searches and transforms (PDF)
Cisco: Cisco TelePresence Video Communication Server Administrator Guide, Software version: X8.1: Regular
Expressions (PDF)
