AudioCodes Mediant 3000 User Manual page 748

Parameter
[EnableUDPPortTranslation] Enables UDP port translation.
Web: SIP NAT Detection
[SIPNatDetection]
User's Manual

[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).

[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 and
EnableIpAddrTranslation parameters, respectively.
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.
748
Description
Document #: LTRT-89738
Mediant 3000