66The system supports to set maximum 64 IP addresses.Type DescriptionIP Address Add host IP address to be added; adopt IPv4 format, suchas 192.168.1.120.IP Network Segment Enter the start address and end address of networksegment to be added.Table 7-5Click “OK”.6.Return to IP purview interface.Click “OK” to save the settings.Step 3IP host in the white list can login WEB interface of the device successfully. The systemdisplays “Login Failed” if IP host in the black list logins the WEB interface.7.6 LAN ConfigSet VTO building no., unit no., no., management centre and group call function.Select “System Config > LAN Config”.Step 1The system displays “LAN Config” interface, as shown in Figure 7-26.Figure 7-26Set parameters and refer to Table 7-6 for details.Step 2Parameter DescriptionBuilding No. Set building no. of VTO.Building Unit No. Set unit no. of VTO.VTO No. Set no. of VTO.Max. ExtensionIndexTick “Group Call” to enable VTO group call function; press the call key onthe VTO, to call master VTH and extension VTH simultaneously. Max.quantity of group call extension VTH shall not exceed “Max. ExtensionGroup Call