COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.6 - Operation/Configuration - V05 09/2016
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Settings
Providers and PBXs
NAT
NAT (Network address translation) converts an IP address of an e. g. private
network into an IP address of the public network. All computers that commu-
nicate with each other within a private network, receive Internet access via
only one IP address. The internal IP addresses of the private network are
not accessible for the Internet.
SIP NAT-Traversal
If NAT traversal is switched on and a query is sent from a local IP address
to the public network, the sending IP address is swapped with the public IP
address. This function is performed in the reverse direction for the reply.
Requirements:
•
Set DNS server
•
STUN server set up for the provider/PBX, if the
Enabled with STUN
option has been selected
•
If the
checked
option has been selected: the
registrar
enabled for the
provider/PBX
Important:
Every port opening on the NAT router is a security risk.
Perform the appropriate security measures.
Enabled
: NAT traversal is performed by the provider/PBX. The SIP
request also contains an "rport" part in which the IP addresses used here
(local, public) are transported.
Disabled
: NAT traversal is not performed by the provider/PBX. The
router, which connects the Local Area Network with the Internet, should be
a properly functioning, SIP-aware router which performs NAT traversal.
Enabled with STUN
: NAT traversal is performed by the provider/PBX.
To achieve this, you must also enter a
STUN server
under
Settings
.