Nat Traversal - D-Link DVG-5121SP User Manual

SIP Setting

6-3. NAT traversal:

Enable STUN- Using STUN protocol prevents problems with setting the IP sharing function, but some NAT do not
support this protocol.
Enable UPnP- To enable the VoIP telephone adapter's IP traffic to pass through a NAT server. This function only
works when the NAT server supports UPnP and has it enabled.
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DVG-5121SP User's Manual
D-Link Corporation