MP-1xx SIP User’s Manual 1. Overview
Version 4.4 17 March 2005
The layout diagram (Figure 1-5), illustrates a typical MP-108 and MP-104 or MP-102 VoIP
application.
Figure
1-5: Typical MP-1xx VoIP Application
1.3 SIP Overview
SIP (Session Initialization Protocol) is an application-layer control (signaling) protocol used on the
MP-1xx 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 MP-1xx, complies with the IETF (Internet Engineering Task
Force) RFC 3261 (refer to http://www.ietf.org
).
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