Storing Numbers in Electronic Address Books
Many users choose to dial people, fax machines, bulletin boards, and other
entities by selecting their names from an address book. The actual number that is
dialed depends on the geographic location of the user and the way the line
device to be used is connected. For example, a desktop computer can have access to
two lines, one connected to a PBX, the other to the telephone company's central
office. When making a call to the same party, different numbers can have to be
used. (To dial through the PBX, for example, the computer may need to dial '9'
to "get out," or a different prefix may be needed for a call made through the
central office.) Or, a user may make calls from a portable computer and want to
use a single, static address book even when calling from different locations
or telephony environments. TAPI's address translation capabilities let the user
inform the computer of the current location and the desired line device for the
call. TAPI then handles any dialing differences, requiring no changes to the
user's address book. An application uses the
lineTranslateAddress function to convert an address from the canonical address format to the
dialable address format (see the next section).
A related topic is the handling of international call-progress monitoring,
which is the process of listening for audible tones such as dial tone, special
information tones, busy signals, and ringback tones to determine the state of a
call (its
progress through the network). Because the cadences and frequencies of call-progress
tones vary from country to country, the service provider must know what call
progress to follow when making an international outbound call. Therefore,
applications specify the destination country code when placing outgoing calls.
- Software for developers
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Delphi Components
.Net Components
Software for Android Developers
- More information resources
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MegaDetailed.Net
Unix Manual Pages
Delphi Examples
- Databases for Amazon shops developers
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Amazon Categories Database
Browse Nodes Database
