Yealink SIP-T38G - Manual (Page 68)

User Guide for the SIP-T38G IP Phone
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If this is the case, the LCD screen could resemble the following figure:
Incoming calls to this line will be distributed evenly among the available line keys.
Similarly, outgoing calls will be distributed.
Your phone can be configured to have a combination of lines with a single line key and
lines with multiple line keys.
Dial plan is a string of characters that governs the way your SIP-T38GIP phone processes
the inputs received from your phone keypad. The SIP-T38G IP phone supports the
following dial plan features:

Replace Rule

Dial-now

Area Code

Block Out
The basic expression syntax you need to know:
Syntax Description
.
The dot "." can be used as a placeholder or multiple placeholders for
any character. Example:
"12." would match "123", "1234","12345","12abc", etc.
x
An "x" can be used as a placeholder for any character. Example:
"12x" would match "121", "122","123","12a", etc.
[]
The square brackets "[]" 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",etc.
()
The parentheses "( )" 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", "773",etc.