[USR-TC] Time-Out Settings

Hello List: On out 3COM, I have setup ,Inactivity Time [min][S19]' settings to '12' minutes (Under TCM > HiPer DSP Cards > Configure > Call Control Options). However, when I test this feature by dialing-in from my PC into 3COM, the connection remains open for an extended number of minutes. I do not know what the maximum time it remains open but as of this post the connection is up for 40+ minutes with no activity from my PC. Is ther anything wrong I am doing? How can I setup so the users disconnect when they reach the 'Inactivity Time"? Kirti