AudioCodes Mediant 4000 SBC User Manual page 839

User's Manual
Parameter
Media Latching
Inbound Media Latch Mode
configure voip > media settings
> inbound-media-latch-mode
[InboundMediaLatchMode]
Version 7.2
AccessList_Use_Specific_Interface, AccessList_Interface_ID,
AccessList_Packet_Size, AccessList_Byte_Rate,
AccessList_Byte_Burst, AccessList_Allow_Type;
[\AccessList]
For example:
AccessList 10 = mgmt.customer.com, , , 32, 0, 80, tcp, 1, OAMP,
0, 0, 0, allow;
AccessList 22 = 10.4.0.0, , , 16, 4000, 9000, any, 0, , 0, 0, 0, block;
In the example above, Rule #10 allows traffic from the host
'mgmt.customer.com' destined to TCP ports 0 to 80 on interface
OAMP (OAMP). Rule #22 blocks traffic from the subnet
10.4.xxx.yyy destined to ports 4000 to 9000.
For more information, see ''Configuring Firewall Rules'' on page
165.
Enables the Media Latching feature.

[0] Strict = Device latches onto the first original stream (IP
address:port). It does not latch onto any other stream during the
session.

[1] Dynamic = (Default) Device latches onto the first stream. If it
receives at least a minimum number of consecutive packets
(configured by New<media type>StreamPackets) from a
different source(s) and the device has not received packets
from the current stream for a user-defined period
(TimeoutToRelatch<media type>Msec), it latches onto the next
packet received from any other stream. If other packets of a
different media type are received from the new stream, based
on IP address and SSRC for RTCP/RTP and based on IP
address only for T.38, the packet is accepted immediately.
Note: If a packet from the original (first latched onto) IP
address:port is received at any time, the device latches onto
this stream.

[2] Dynamic-Strict = Device latches onto the first stream. If it
receives at least a minimum number of consecutive packets
(configured by New<media type>StreamPackets) all from the
same source which is different to the first stream and the device
has not received packets from the current stream for a user-
defined period (TimeoutToRelatch<media type>Msec), it
latches onto the next packet received from any other stream. If
other packets of different media type are received from the new
stream based on IP address and SSRC for RTCP and based on
IP address only for T.38, the packet is accepted immediately.
Note: If a packet from the original (first latched onto) IP
address:port is received at any time, the device latches onto
this stream.

[3] Strict-On-First = Typically used for NAT, where the correct IP
address:port is initially unknown. The device latches onto the
stream received in the first packet. The device does not change
this stream unless a packet is later received from the original
source.
Note: If you configure the parameter to [0] Strict, the device cannot
perform NAT traversal. In this setup, configure the NATMode
839
60. Configuration Parameters Reference
Description
Mediant 4000 SBC