iPod IWIP3G User Guide - Page 93

IAC is very useful in cases where the module needs to be visible in the inquiry

Page 93 highlights

Note:  IAC is very useful in cases where the module needs to be visible in the inquiry but only for dedicated devices, such as other iWRAP modules, but not for standard devices like PCs or mobile phones. When the value of IAC is left to default value (0x9e8b33) iWRAP will be visible for all devices capable of making an inquiry. On the other, hand when IAC is set to 0x9e8b00 (LIAC), only devices capable of making limited inquiry will be able to discover iWRAP. Using LIAC will usually speed up the inquiry process since standard Bluetooth device like mobile phones and PC will normally not respond to inquiry. 93

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93
Note:
IAC is very useful in cases where the module needs to be visible in the inquiry but
only for dedicated devices, such as other iWRAP modules, but not for standard
devices like PCs or mobile phones. When the value of IAC is left to default value
(
0x9e8b33
) iWRAP will be visible for all devices capable of making an inquiry. On
the other, hand when IAC is set to 0x9e8b00 (LIAC), only devices capable of
making limited inquiry will be able to discover iWRAP. Using LIAC will usually speed
up the inquiry process since standard
Bluetooth
device like mobile phones and PC
will normally not respond to inquiry.