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Planning and Installation Guide F – 1

PPENDIX

Session Initiated Protocol

This chapter provides detailed information about the Session Initiated Protocol (SIP).

You should refer to this chapter for help in planning a SIP deployment on your

ShoreTel system.

Overview

Session Initiation Protocol (SIP - RFC 3261) is a newer protocol that is still being fine

tuned by the IETF and that is regarded as having the potential to become the global

signaling standard that will enable all switches, gateways, and phones to talk to one

another.

The protocol, which works at the application layer, allows users to initiate interactive

sessions between any network devices that support the protocol. SIP is capable of

initiating or terminating Internet telephony calls and other multimedia applications

such as video or gaming.

The protocol is based on a client-server model. With support for redirection services,

networked users can initiate a call or receive a call, regardless of their physical location.

In its networking negotiations SIP takes into account the following pieces of

information:

• the address of the end system

• the physical media

• the call recipient's acceptance to the invitation

The protocol then configures the parameters for the session and handles the call setup

and tear-down.

SIP allows two discrete ShoreTel systems to be integrated with any IP connection,

without the need for physical tie trunking. (Note that care should be taken to make

sure that the extension numbering plans in the two systems do not overlap, and that if

they do overlap, translation tables need to be used to resolve conflicts.)

Further, the addition of SIP obviates the need to support other trunking standards,

such as BRI, through use of a SIP gateway.

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