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Title : Extension to the Session Description
Protocol (SDP) for Bypass of Border Gateways
Author(s) : R. Ejzak
Filename : draft-ejzak-mmusic-bg-bypass-00.txt
Pages : 39
Date : 2008-12-17
This document describes an extension to the Session Description
Protocol (SDP) that can be used by systems of cooperating networks
using Application Level Gateways (ALG) to insert border gateways
performing as Network Address Port Translators (NAPT) between their
IP realms to identify when border gateways can be bypassed for more
efficient media flow. This extension can be used by networks based
on a protocol using the SDP offer/answer model, such as the IP
Multimedia Subsystem (IMS) of the Third Generation Partnership
Project (3GPP), which is based on the Session Initiation Protocol
(SIP). ALGs using this extension can determine within a single SDP
offer/answer transaction when the insertion of a new border gateway
would cause the media path to re-enter an IP realm visited elsewhere within the media path, and to bypass one or more border gateways
that would otherwise be included in the media path. This extension
also works with hosted NAPT traversal schemes to establish a direct
media path between endpoints within the same IP realm. Optional
procedures provide additional means to improve media flow.
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