Hi, could this PC Ok for me: http://www.amazon.de/Atom-D2700-DualCore-M%C2%B5-Style-fanless/dp/B007QN6DY6/ref=cm_cr_pr_product_top I would use Windows 7 32bit as OS. The system would operate behind NAT (protected by pfSense Firewall). The office has ADSL (50Mbits Down and 2Mbits Up) The clients are connected via OpneVPN. User Codec G711. 1Mbits would be reserved for VoIP with pfSense-QoS. Thank you very much confirming if it is OK. Best Regards, I.