ZMODO ZP-IBH13-P 720P HD H.264 PoE IP Infrared Weatherproof Camera with QR Code Smartphone Setup - Zviewer Windows User Manual - Manual (Page 32)

【 Switch】If in LAN it has server with UPNP function, enable this
function, the server will automatically forward the set port to public
network.
【 web mapping port】set the web port which will be mapping to
the server.
【 digital mapping port】set the digital port which will be mapping to
the server.
【 Mobile phone mapping port】set the mobile phone port which will
be mapping to the server.
DDNS Service Settings：