User`s manual

MediaPack
SIP User's Manual 20 Document #: LTRT-65408
The layout diagram (Figure 1-1), illustrates a typical MediaPack VoIP application.
Figure 1-1: Typical MediaPack VoIP Application
1.2 SIP Overview
SIP (Session Initialization Protocol) is an application-layer control (signaling) protocol used
on the MediaPack for creating, modifying, and terminating sessions with one or more
participants. These sessions can include Internet telephone calls, media announcements
and conferences.
SIP invitations are used to create sessions and carry session descriptions that enable
participants to agree on a set of compatible media types. SIP uses elements called Proxy
servers to help route requests to the user's current location, authenticate and authorize
users for services, implement provider call-routing policies and provide features to users.
SIP also provides a registration function that enables users to upload their current locations
for use by Proxy servers. SIP, on the MediaPack, complies with the IETF (Internet
Engineering Task Force) RFC 3261 (refer to http://www.ietf.org
).