Configuring Network
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2. Enter the IP address or the domain name of the STUN server in the STUN Server
field.
3. Enter the port of the STUN server in the Port field.
4. Press the Save soft key to accept the change.
To configure STUN server for SIP direct account via the remote control:
1. Select Menu->Advanced (default password: 0000) ->SIP Direct Account.
2. Select STUN from the pull-down list of NAT_Traversal.
3. Press the Save soft key to accept the change.
Full Cone:
A full cone NAT is one where all requests from the same internal IP address and port are
mapped to the same external IP address and port. Furthermore, any external host can
send a packet to the internal host, by sending a packet to the mapped external
address.
Restricted Cone:
A restricted cone NAT is one where all requests from the same internal IP address and
port are mapped to the same external IP address and port. Unlike a full cone NAT, an
external host (with IP address X) can send a packet to the internal host only if the
internal host had previously sent a packet to IP address X.
Port Restricted Cone:
A port restricted cone NAT is like a restricted cone NAT, but the restriction includes port
numbers. Specifically, an external host can send a packet, with source IP address X and
source port P, to the internal host only if the internal host had previously sent a packet to
IP address X and port P.
Symmetric:
A symmetric NAT is one where all requests from the same internal IP address and port,
to a specific destination IP address and port, are mapped to the same external IP
address and port. If the same host sends a packet with the same source address and
port, but to a different destination, a different mapping is used. Furthermore, only the
external host that receives a packet can send a UDP packet back to the internal host.
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