Zycoo CooVox T Series, Руководство администратора и пользователя

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- 114 - ZYCOO CooVox T-series IP Phone System Admin User Guide v4.0.0
Ensure VLAN IPs for VLAN1 and VLAN2 of WAN and LAN interfaces are in several different network segments.
VPN
Path: System -> Network Settings -> VPN
VPN (Virtual Private Network) is mainly used for setting up long-distance and/or secured network connections.
When used on the IPPBX system, all phone calls made and received are encrypted so it secures your remote
offices/extensions' phone services. Built-in VPN Server on the CooVox series IPPBX system is an easy way to set up
a secured connection between other CooVox series IPPBXs or IP phones. You don't need to build a dedicated VPN
server or buy a VPN router. This is also a workaround to avoid firewall issues when configuring remote VoIP client
such as SIP protocol which is notoriously difficult to pass through a firewall due to its random port numbers to
establish connection.