User's Manual
54. Configuration Parameters Reference
Version 6.8
709
Mediant 500 E-SBC
54.2.5 NAT Parameters
The Network Address Translation (NAT) parameters are described in the table below.
Table
54-13: NAT Parameters
Parameter
Description
Web/EMS: NAT Mode
CLI: disable-NAT-traversal
[NATMode
]
Enables the NAT feature for media when the device communicates
with UAs located behind NAT.
[0]
Auto-Detect = NAT is performed only if necessary. If the UA is
identified as being located behind NAT, the device sends the
media packets to the public IP address:port obtained from the
source address of the first media packet received from the UA.
Otherwise, the packets are sent using the IP address:port
obtained from the address in the first received SIP message.
Note also that if the SIP session is established (ACK) and the
device (not the UA) sends the first packet, it sends it to the
address obtained from the SIP message and only after the device
receives the first packet from the UA, does it determine whether
the UA is behind NAT.
[1]
NAT Is Not Used = (Default) NAT feature is disabled. The
device always sends the media packets to the remote UA using
the IP address:port obtained from the first received SIP message.
[2]
NAT Is Used = NAT is always performed. The device always
sends the media packets to the remote UA using the source
address obtained from the first media packet from the UA. In this
mode, the device does not send any packets until it receives the
first packet from the UA (in order to obtain the IP address).
For more information on handling calls from UAs behind NAT, see
''First Incoming Packet Mechanism'' on page
Web: NAT IP Address
EMS: Static NAT IP Address
CLI: nat-ip-addr
[StaticNatIP]
Defines the global (public) IP address of the device to enable static
NAT between the device and the Internet.
Note:
For this parameter to take effect, a device reset is required.
Web: SIP NAT Detection
CLI: configure voip/sip-
definition advanced-
settings/sip-nat-detect
[SIPNatDetection]
Enables the device to detect whether the incoming INVITE message
is sent from an endpoint located behind NAT.
[0]
Disable = Disables the device's NAT Detection mechanism.
Incoming SIP messages are processed as received from
endpoints that are not located behind NAT and sent according to
the SIP standard.
[1]
Enable (default) = Enables the device's NAT Detection
mechanism.
EMS: Binding Life Time
[NATBindingDefaultTimeout]
The device sends SNMP keep-alive traps periodically - every 9/10 of
the time configured by this parameter (in seconds). Therefore, the
parameter is applicable only if the SendKeepAliveTrap parameter is
set to 1.
The parameter is used to allow SNMP communication with
AudioCodes EMS management platform, located in the WAN, when
the device is located behind NAT. It is needed to keep the NAT
pinhole open for the SNMP messages sent from EMS to the device .
The valid range is 0 to 2,592,000. The default is 30.
Note: For this parameter to take effect, a device reset is required.
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