The LINEBUSYMODE_ bit-flag constants describe different busy signals that the
switch or network may generate. These busy signals typically indicate that a
different resource that is required to make a call is currently in use.
The busy signal indicates that the called party's station is busy. This is
usually signaled with a normal
The busy signal indicates that a trunk or circuit is busy. This is usually
signaled with a fast
The busy signal's specific mode is currently unknown but may become known
The busy signal's specific mode is unavailable and will not become known.
The high-order 16 bits can be assigned for device-specific extensions. The
low-order 16 bits are reserved.
Note that busy signals may be sent as inband tones or out-of-band messages.
TAPI makes no assumption about the specific signaling mechanism.
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