User`s manual

Table Of Contents
Mediant 2000 & TP-1610 & TP-260
SIP User's Manual 22 Document #: LTRT-68805
Figure 1-1 below illustrates typical Mediant 2000 / TP-1610 / TP-260 gateway applications
over VoIP network.
Figure 1-1: Typical Mediant 2000 / TP-1610 / TP-260 Gateway Application
1.5 SIP Overview
SIP is an application-layer control (signaling) protocol used on the gateway 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 gateway, complies with the IETF (Internet
Engineering Task Force) RFC 3261 (refer to www.ietf.org/rfc/rfc3261.txt?number=3261
).