Cisco Systems 1.3.0 manual Core System Features, Set-Based Features

Features

Features

Introduction	This section describes the types of feature supported by the VOCAL system.
Overview
	The VOCAL system supports two types of features— core system features
	and set-based features.
	Core System Features
	Core system features are those that involve rerouting calls under certain
	conditions, such as the called party is busy, or the phone number being
	called is forbidden.
	Set-Based Features
	Set-based features are those that require functions to built into the phone
	sets to interpret information coming from the SIP messages. For example,
	SIP messages contain Caller ID information, but the phone cannot make use
	of it unless it has a Caller ID Display.

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