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Voice Gateways System Manual 51
Click on the Save button before leaving the page to save the new settings. The new
settings will be applied after restarting the unit.
3.7.4 STUN Client Configuration Page (SIP only)
Simple Traversal of UDP (STUN) is a method of NAT traversal through UDP, based
on RFC 3489. For proper voice conversations in networks based on more than one
NAT, the NAT devices must be able to transfer RTP packets in both directions.
The STUN protocol uses the default server port 3478. The Voice Gateway
communicates with a server over the internet. Based on the RTP packets, the
Server knows the number of NATs behind which the Voice Gateway is located, the
IP address of the Voice Gateway, and which of the Voice Gateway's ports are
actually used.
The STUN application supports the following NAT Types: FullCone, FullRestrict,
and PortRestrict. The Voice Gateway does not support symmetrical NAT as it is
not meant to traverse symmetrical NAT devices.
Static NAT Mode: The NAT mode:
On = Enable NAT Traversal function using manual setting.
Auto = Enter NAT mode if any of the following conditions is met:a.
IP-address = Private IP address b. "received" parameter in INVITE or
REGISTER IP-address is not equal to internal IP address.
Off = NAT Traversal function is disabled.The default is Off.
When using a NAT device, it is recommended to set this parameter to ON
and to enter the External NAT-mapped IP Address.
Table 3-10: NAT Traversal Configuration Page Parameters
Parameter Description