Yealink SIP-T20 - Manual (Page 56)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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To disable an account via phone user interface:
1. Press .
2. Select Settings->Advanced ->Accounts.
3. Select the desired account.
4. Select Disable from the Activation field.
5. Press to accept the change.
Account registration is configurable via web user interface at the path
Account->Register.
You can configure two line keys to associate with an account. This enhances call
visualization and simplifies call handling.
Incoming calls to this account will be distributed evenly among the available line keys.
Outgoing calls will be distributed similarly.
Your phone can be configured to have a combination of accounts with a line key and
accounts with two
line keys.
Dial plan is a string of characters that governs the way your SIP-T20P/SIP-T20 IP phone
processes the inputs received from your phone keypad. The SIP-T20P/SIP-T20 IP phone
supports the following dial plan features:

Replace Rule

Dial-now

Area Code

Block Out
The basic expression syntax you need to know:
.
The dot ‖.‖ can be used as a placeholder or multiple placeholders for any
character. Example:
―12.‖ would match ―123‖, ―1234‖, ―12345‖, etc.
x
An ―x‖ can be used as a placeholder for any character. Example:
―12x‖ would match ―121‖, ―122‖, ―123‖, 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‖.
()
The parentheses ―( ) ―can be used to group together patterns, for instance, to
logically combine two or more patterns. Example: