User's Manual 172 Document #: LTRT-89730
Mediant 3000
configured using the T38FaxSessionImmediateStart parameter. The No-Op packets are
enabled using the NoOpEnable and NoOpInterval parameters.
13.10 Robust Receipt of Media Streams by Media Latching
The Robust Media mechanism (or media latching) is an AudioCodes proprietary
mechanism to filter out unwanted media (RTP, RTCP, SRTP, SRTCP, and T.38) streams
that are sent to the same port number of the device. Media ports may receive additional
multiple unwanted media streams (from multiple sources of traffic) as result of traces of
previous calls, call control errors, or deliberate malicious attacks (e.g., Denial of Service).
When the device receives more than one media stream on the same port, the Robust
Media mechanism detects the valid media stream and ignores the rest. Thus, this can
prevent an established call been stolen by a malicious attacker on the media stream.
For a detailed description of the robust media parameters, see ''General Security
Parameters'' on page 867.
13.11 Multiple Routers Support
Multiple routers support is designed to assist the device when it operates in a multiple
routers network. The device learns the network topology by responding to Internet Control
Message Protocol (ICMP) redirections and caches them as routing rules (with expiration
time).
When a set of routers operating within the same subnet serve as devices to that network
and intercommunicate using a dynamic routing protocol, the routers can determine the
shortest path to a certain destination and signal the remote host the existence of the better
route. Using multiple router support, the device can utilize these router messages to
change its next hop and establish the best path.
Note: Multiple Routers support is an integral feature
configuration.
13.12 IP Multicasting
The device supports IP Multicasting level 1, according to RFC 2236 (i.e., IGMP version 2)
for RTP channels. The device is capable of transmitting and receiving multicast packets.
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