< All Topics Main Requirements Hardware requirements Print Hardware requirementsMemory (RAM)4 GBBandwidth500 Kbps up / 800 down for 2-person video calls; 500 Kbps up / 1.2 Kbps down for 3- and 4-person video callsFirewall PortsTCP 443, 17990, 17992, 1025-2048, 5060-5061; UDP 50000-65535HD ResolutionGraphics capabilities that support HD resolution on one or more displays