Yealink SIP-T3 Specifications download pdf (Page 47)

Getting Started

Creating Dial Plan

Regular expression, often called a pattern, is an expression that specifies a set of strings.

A regular expression provides a concise and flexible means to “match” (specify and

recognize) strings of text, such as particular characters, words, or patterns of characters.

Regular expression is used by many text editors, utilities, and programming languages to

search and manipulate text based on patterns.

Regular expression can be used to define IP phone dial plan. Dial plan is a string of

characters that governs the way for IP phones processing the inputs received from the

IP phone keypads. IP phones support the following dial plan features:

 Replace Rule

 Dial-now

 Area Code

 Block Out

You need to know the following basic regular expression syntax when creating dial

plan:

The dot “.” can be used as a placeholder or multiple placeholders

for any string. Example:

“12.” would match “123”, “1234”, “12345”, “12abc”, etc.

The “x” can be used as a placeholder for any character. Example:

“12x” would match “121”, “122”, “123”, “12a”, etc.

The dash “-” can be used to match a range of characters within the

brackets. Example:

“[5-7]” would match the number “5”, ”6” or ”7”.

The comma “,” can be used as a separator within the bracket.

Example:

“[2,5,8]” would match the number ”2”, “5” or “8”.

[]

The square bracket "[]" can be used as a placeholder for a single

character which matches any of a set of characters. Example:

"91[5-7]1234"would match “9151234”, “9161234”, “9171234”.

()

The parenthesis "( )" can be used to group together patterns, for

instance, to logically combine two or more patterns. Example:

"([1-9])([2-7])3" would match “923”, “153”, “673”, etc.

The “$” followed by the sequence number of a parenthesis means

the characters placed in the parenthesis. The sequence number

stands for the corresponding parenthesis. Example:

A replace rule configuration, Prefix: "001(xxx)45(xx)", Replace:

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 464 465

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Yealink SIP-T3 Specifications Page 47