Dns Parameters - AudioCodes Mediant 4000 SBC User Manual

Parameter
[NATBindingDefaultTimeout] The device sends SNMP keep-alive traps periodically - every 9/10 of
SIP NAT Detection
configure voip > sip-
definition advanced-settings
> sip-nat-detect
[SIPNatDetection]

60.2.6 DNS Parameters

The Domain name System (DNS) parameters are described in the table below.
Parameter
Internal DNS Table
User's Manual
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 145.
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 OVOC 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 OVOC to the device.
The valid range is 0 to 2,592,000. The default is 30.
Note: For the parameter to take effect, a device reset is required.
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.
Table 60-14: DNS Parameters
824
Description
Description
Document #: LTRT-40203
Mediant 4000 SBC