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V6100 and V7122 User Guide
For a detailed description of the
ini
file parameters for PPPoE, see
Networking Parameters
.
IP Multicasting
The gateway supports IP Multicasting level 1 according to RFC 2236 (i.e. IGMP version 2)
for RTP channels. The gateway is capable of transmitting and receiving Multicast packets.
Robust Reception of RTP Streams
This mechanism filters out unwanted RTP streams that are sent to the same port number on
the gateway. These multiple RTP streams can result from traces of previous calls, call
control errors and deliberate attacks.
When more than one RTP stream reaches the gateway on the same port number, the
gateway accepts only one of the RTP streams and rejects the rest of the streams. The RTP
stream is selected according to the following procedure:
The first packet arriving on a newly opened channel sets the source IP address and UDP
port from which further packets are received. Thus, the source IP address and UDP port
identify the currently accepted stream. If a new packet arrives whose source IP address or
UDP port are different to the currently accepted RTP stream, there are two options:
The new packet has a source IP address and UDP port which are the same as the
remote IP address and UDP port that were stated during the opening of the channel. In
this case, the gateway reverts to this new RTP stream.
The new packet has any other source IP address and UDP port, in which case the
packet is dropped.
Multiple Routers Support
Multiple routers support is designed to assist the media gateway when it operates in a
multiple routers network. The gateway learns the network topology by responding to ICMP
redirections and caches them as routing rules (with expiration time).
When a set of routers operating within the same subnet serve as gateways to that network
and intercommunicate using a dynamic routing protocol (such as OSPF, etc.), 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 media gateway can utilize
these router messages to change its next hop and establish the best path.
Multiple Routers support is an integral feature that doesn’t require configuration.
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Страница 449: ...V6100 and V7122 User Guide 449 Figure 146 Connection Module CM Figure 147 OSN Server Figure 148 Hard Drive Module HDMX...
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