Version 7.2 1077 Mediant 800B Gateway & E-SBC
User's Manual 72. Configuration Parameters Reference
Table 72-14: NAT Parameters
Parameter Description
NAT Traversal
configure voip > media
settings > disable-NAT-
traversal
[NATMode]
Enables the NAT traversal feature for media when the device
communicates with UAs located behind NAT.
[0] Enable NAT Option = NAT traversal is performed only if the UA
is located behind NAT:
UA behind NAT: The device sends the media packets to the IP
address:port obtained from the source address of the first
media packet received from the UA.
UA not behind NAT: The device sends the packets to the IP
address:port specified in the SDP 'c=' line (Connection) of the
first received SIP message.
Note: 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] Disable NAT = (Default) The device considers the UA as not
located behind NAT and sends media packets to the UA using the
IP address:port specified in the SDP 'c=' line (Connection) of the
first received SIP message.
[2] Force NAT = The device always considers the UA as behind
NAT and sends the media packets to the IP address:port obtained
from the source address of the first media packet received from the
UA. The device only sends packets to the UA after it receives the
first packet from the UA (to obtain the IP address).
[3] NAT By Signaling = The device identifies whether or not the UA
is located behind NAT based on the SIP signaling. The device
assumes that if signaling is behind NAT that the media is also
behind NAT, and vice versa. If located behind NAT, the device
sends media as described in option [2] Force NAT; if not behind
NAT, the device sends media as described in option [1] Disable
NAT. This option is applicable only to SBC calls. If the parameter is
configured to this option, Gateway calls use option [0] Enable NAT
Option, by default.
For more information on NAT traversal, see 'First Incoming Packet
Mechanism' on page 161.
NAT IP Address
configure voip > sip-
definition general-settings >
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 the parameter to take effect, a device reset is required.
The parameter is applicable only to the Gateway application.
[NATBindingDefaultTimeout]
The device sends SNMP keep-alive traps periodically - every 9/10 of
the time configured by the 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.
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