D-Link DSL-G2452GR User Manual page 91

Section 4 - Configuration
NAT Traversal
The NAT Traversal function allows VoIP traffic to pass through the NAT-enabled router.
Select Disabled to disable the function.
Select STUN to enable the STUN client (Session Traversal Utilities for NAT). The STUN client
sends requests to a STUN server. On the basis of the received replies, the client allows VoIP
traffic to pass through the NAT-enabled router. When this value is selected, the Server
address, Port and Binding period fields will become available for editing.
Select NAT Public IP to manually specify the public IP address of an upper-level router
which exchanges service messages with the SIP proxy server. When this value is selected,
the Public address and Port fields will become available for editing.
Network Settings
RTP/SIP DSCP
This is the Differentiated Services Codepoint. From the drop-down
list, select tags for voice and signaling traffic.
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