Welltech WG2504 FXS V.4.02 - Manual (Page 37)

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4-4 NAT Traversal
The Wellgate 2504 support the following NAT traversal methods
Figure 4-4 NAT Traversal
 NAT Traversal:
 Disable: Disable NAT traversal features
 STUN (Type 1,2): Enable STUN for NAT traversal. Since
STUN can be used only for type 1 and type 2 NAT server, it is
recommended to use this option. When STUN client detect
the used NAT is type 3 NAT, it will stop the STUN feature.

STUN Server: STUN Server IP address
 STUN (All): No matter which NAT type server are used,
STUN is always to be used for NAT traversal.

STUN Server: STUN Server IP address
 UPNP: Enable UPnP client for NAT traversal. Please note that
the IP sharing box need support uPnP feature.
 Behind NAT: Use DMZ for NAT traversal

IP Sharing Address: public IP sharing address. You
need to specify the port mapping or DMZ for all
required port.