Hello, I've been going through some threads about virtualization, some say it works for them, others say it doesn't. Multiple platforms are used like MS Hyper-V, VM Ware, etc. We currently run FS on a physical box, which works great. We have our own virtual environment, VMWare vSphere 5.0. Our 5.0 environment is running under heavy load and I was wondering would FS (configured properly for correct timing) still function properly and able to handle hundreds of concurrent calls on a heavy loaded VMWare host? The FS virtual will also process RTP in default mode. I was hoping if someone had any experience using this setup and could give me some insights on this matter. The FS virtuals will function only as SBC's, so no complex dial plans, no call recording, no conferencing. Just bridging the incoming call leg with an outgoing one. VMWare has a tech paper about running VoIP on their virtual machine, and they claim it works. (http://www.vmware.com/files/pdf/techpaper/voip-perf-vsphere5.pdf). In the paper they used Mitel vMCD, but I'm not sure if the software has been optimized to run on VMWare so the tests would come out better than running any other telephony software like FreeSwitch or Asterisk. Grant