To enable modem disconnect on call-waiting for Lucent Technologies Soft Modem AMR (IBM ThinkPad i Series 1300, etc?) for Windows XP/2000. First, get this (V.92 driver for the Lucent/Agere Soft Modem AMR) Toshiba Software Modem Driver v.SM2121ALL02 for Windows XP/2000; http://cdgenp01.csd.toshiba.com/content/support/downloads/s195zmdm2.exe
Next, unzip its contents to C:\modem.temp (the default path)
Then, go to your Windows control panel and double-click on System, choose Hardware tab, then Device Manager.
Locate and expand your installed Modems, double-click on your existing Lucent/Agere Soft Modem AMR driver to view its properties, choose Driver tab, then click on