AudioCodes Mediant 1000B User Manual page 732

Parameter
CLI: disable-NAT-traversal
[NATMode]
Web: NAT IP Address
EMS: Static NAT IP Address
CLI: nat-ip-addr
[StaticNatIP]
[EnableIPAddrTranslation]
[EnableUDPPortTranslation]
User's Manual
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 139.
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.
Enables IP address translation for RTP, RTCP, and T.38 packets.

[0] = Disable IP address translation.

[1] = (Default) Enable IP address translation.
When enabled, the device compares the source IP address of the
first incoming packet to the remote IP address stated in the opening
of the channel. If the two IP addresses don't match, the NAT
mechanism is activated. Consequently, the remote IP address of the
outgoing stream is replaced by the source IP address of the first
incoming packet.
Notes:

The NAT mechanism must be enabled for this parameter to take
effect (see the NATMode parameter).
Enables UDP port translation.

[0] = (Default) Disables UDP port translation.

[1] = Enables UDP port translation. The device compares the
source UDP port of the first incoming packet to the remote UDP
port stated in the opening of the channel. If the two UDP ports
don't match, the NAT mechanism is activated. Consequently, the
remote UDP port of the outgoing stream is replaced by the
source UDP port of the first incoming packet.
Notes:

For this parameter to take effect, a device reset is required.

The NAT mechanism and the IP address translation must be
enabled for this parameter to take effect, using the NATMode
parameter and the EnableIpAddrTranslation parameter,
732
Mediant 1000B Gateway & SBC
Description
Document #: LTRT-27034