The Extreme XOS Concepts Guide states that Qosprofile QP7 cannot be created on stacked switches, but I have read somewhere, I can't remember where, that both QP7 and QP6 are unavailable when switches are stacked; which is correct plese? We used to use QP7 for IP telephony, but re-configured this to QP5 when we started stacking switches last year. Since then we have also started using QP4 for CCTV. I avoided using QP6 because I wasn't sure about it.