The LINETONEMODE_ constants describe different selections that are used when
generating line tones.
The tone is a custom tone defined by its component frequencies, of type LINEGENERATETONE
The tone is ringback tone. Exact definition is service-provider defined.
The tone is a busy tone. Exact definition is service-provider defined.
The tone is a beep, such as that used to announce the beginning of a
recording. Exact definition is service-provider defined.
The tone is a billing information tone such as a credit card prompt tone.
Exact definition is service-provider defined.
The high-order 16 bits can be assigned for device-specific extensions. The
low-order 16 bits are reserved.
These constants are used to define tones to be generated inband over a call to
the remote party. Note that tone detection of non-custom tones does not use
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