A-2
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.