COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.6 - Operation/Configuration - V05 09/2016
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Settings
Providers and PBXs
Important:
Every port opening on the NAT router is a security risk.
Perform the appropriate security measures.
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 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)
Enter NAT keep alive interval.
Note:
Some providers lock accounts if the
NAT keep alive interval
is
too short. As a rule, this is reported with error message 503 during SIP
registration. If this problem occurs, we recommend you reduce the value
(e.g. to 180).