I'm going to aquire MCS-7815-I2 (Voice IP central) with CallMgr 4.2, plus "2811 Voice Security Bundle,PVDM2-16,Adv IP Serv,64F/256D", "1-port ADSLoPOTS HWIC" and "1-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1". With this kind of equipme...