You can modify the state of the telephone line through a TTelephoneLineHandle.
TTelephoneLineConfigurationData uniquely specifies the telephone line to use. TTelephoneLineHandle provides member functions for initiating telephone call connections, determining the hook status of the line, and accessing telephone feature types.
| Line status | Description | |
| kOnHook | Line or handset is on-hook. | |
| kOffHook | Line or handset is off-hook. |
You can create multiple instances of TTelephoneLineHandle for the same line and distribute them across task boundaries. This allows a user to run multiple programs that use the same line, such as an answering machine application and an auto-dial application.
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