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Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

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Notes on selected proxy configurations<br />

T.120 conferences are arranged into a hierarchy <strong>of</strong> nodes. The<br />

placement <strong>of</strong> the <strong>Sidewinder</strong> <strong>G2</strong> with respect to the nodes in the<br />

conference affects how many sessions are created through the proxy<br />

and the communication path <strong>of</strong> the conference data. When a first<br />

conference participant joins a conference in a different burb, a T.120<br />

session will be created between the participant's node and the<br />

contacted node. If a second conference participant attempts to contact<br />

the new conference node, a separate session will be created.<br />

The preconfigured NetMeeting proxy rule (when added to the active<br />

rule group) will apply to each participant’s respective node IP<br />

address. On the other hand, if the second participant contacts the first<br />

participant and asks to join the conference, the same session through<br />

the proxy will be used. The NetMeeting proxy rule, which applies to<br />

the first participant’s node will also apply to this session.<br />

The T.120 proxy is configured to use port 1503 by default. This can be<br />

changed as described in “Configuring proxies” on page 8-28.<br />

About the H.323 proxy<br />

H.323 is an International Telecommunications Union (ITU) standard<br />

that provides support for audio and video conferencing across a<br />

shared medium such as the Internet. The H.323 proxy provides for<br />

safe transfer <strong>of</strong> packets between burbs, standard functions such as<br />

filtering on source and destination hosts and burbs, and NAT and<br />

redirection. The H.323 proxy is a protocol-aware, application layer<br />

proxy that examines H.323 packets for correctness and adherence to<br />

site security policy. In addition to the standard filtering mentioned<br />

above, the H.323 proxy provides a mechanism for allowing or<br />

disallowing certain codecs (audio or video encoding schemes) within<br />

the H.323 protocol. (See the H.323 permissions discussion in “Creating<br />

proxy rules” on page 7-4.)<br />

Micros<strong>of</strong>t NetMeeting is a popular implementation <strong>of</strong> the H.323<br />

protocol. The H.323 proxy enables you to use the audio and video<br />

features <strong>of</strong> data conferencing products, such as NetMeeting.<br />

Note: The standard data conferencing features, as well as the chat and application<br />

sharing features <strong>of</strong> NetMeeting are not supported by the H.323 proxy. To provide support<br />

for these features, you must also enable the T.120 proxy. You must also add the preconfigured<br />

NetMeeting proxy rule to the active proxy rule group. This will ensure that both<br />

proxies remain in synchronization with one another. See “Synchronizing the T.120 and<br />

H.323 proxies for use with NetMeeting” on page 8-25 for more information.<br />

Configuring Proxies 8-23

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