Cisco 521SG - Unified IP Phone VoIP Administration Manual page 260

Cisco SPA IP Phone Field Reference
Regional Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
Feature Dial Services
Codes
Description
These codes tell the Cisco SPA9000 what to do when
the user is listening to the first or second dial tone.
One or more *code can be configured into this
parameter, such as *72, or *72|*74|*67|*82, and so forth.
The maximum total length is 79 characters. This
parameter applies when the user has a dial tone (first
or second dial tone). Enter *code (and the following
target number according to current dial plan) entered
at the dial tone triggers the Cisco SPA9000 to call the
target number prepended by the *code. For example,
after user dials *72, the Cisco SPA9000 plays a prompt
tone awaiting the user to enter a valid target number.
When a complete number is entered, the
Cisco SPA9000 sends a INVITE to
*72<target_number> as in a normal call. This feature
allows the proxy to process features like call forward
(*72) or BLock Caller ID (*67).
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