The LINEANSWERMODE_ bit-flag constants describe how an existing active call on a line device is affected by answering another offering call on the same line.
No extensibility. All 32 bits are reserved.
If a call comes in (is offered) at the time another call is already active, the new call is connected to by invoking lineAnswer. The effect this has on the existing active call depends on the line's device capabilities. The first call may be unaffected, it may automatically be dropped, or it may automatically be placed on hold.