Help with sip trunk Maximum Channels

I am trying to limit the inbound as well as the outbound but i just don’t get the little note that pops up on the mouse hover. I have tried to put the from-trunk-trunkname that is auto generated down in the box that says context= under user details and i still can receive more than the 1 call specified. I just need to know how to limit incoming and outgoing from the trunk to save on bandwidth. Someone started to talk about it here http://freepbx.org/forum/freepbx/users/maximum-channels-not-working-with-sip-trunk but the person didn’t need help with inbound. Outbound works fine, (stops after the 1 and says all circuits are busy) but inbound keeps coming in.