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Receiving Information
An application receives information in two ways: solicited and unsolicited.
Solicited information is requested by the application through a function call
such as lineGetDevCaps or lineGetAddressCaps. Unsolicited information arrives in the form of messages most importantly call-state messages. Often, the two mechanisms are used
together, as when an application receives a LINE_CALLSTATE message, after which it checks the information contained in the LINECALLINFO structure by calling lineGetCallInfo.
An application can call lineGetDevCaps to learn more about available lines. The application determines the names of
the lines and the number of addresses on those lines. (An important factor in
the configuration of lines and addresses is the way the service provider chooses
to map lines and addresses. Though the application has no control over this
mapping, it can determine the details of the mapping by calling functions such as lineGetDevCaps.) Later, using this information, the application could allow the user to
choose which line (and address) to use for an outgoing call, restricting the lines
it displays (in a dialog box, for example) to those that support a specific
media mode. As an example, an application designed to be used only for faxing may
choose to let the user select only lines that support fax transmission.
Call lineGetAddressCaps to obtain information for a given address. The application can use the names
of the addresses to let the user choose them in a popup menu, but other
information is also reported, such as whether caller-ID is supported, what kinds of
call states can be produced, and how many active calls can exist on that address.
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