COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information - V02 06/2017
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Settings
Providers and PBXs
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
Activado con uso de
STUN
option has been selected
•
If the
Activado
option has been selected: the
Registrador
enabled for
the provider/PBX
Important:
Every port opening on the NAT router is a security risk.
Perform the appropriate security measures.
Desactivado
: 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.
Activado con uso de STUN
: NAT traversal is performed by the
provider/PBX. To do this, you must also specify a STUN server.
NAT-Keep-Alive
Keep alive maintains the connection between client and server by sending
NAT keep alive packets which prevent the interruption of the connection. An
intveral for the sending of those NAT keep alive packets must be deter-
mined. This interval indicates after how many seconds NAT keep alive
packets are send to maintain the NAT mapping in the firewall.
NAT keep alive is enabled and an additional entry must be made:
NAT keep alive interval (sec.) (15...255)