16 CHAPTER 1: VCX SYSTEM MAINTENANCE OVERVIEW
Network-based Telephony
The VCX IP Telephony Solution (referred to in this guide as the VCX
system) merges telephony with networking by delivering business
telephone service over a data network.
The VCX architecture provides a distributed call processing system using
the SIP signalling protocol to establish voice, video, and text sessions
between SIP phones and other SIP-compatible devices. The system can be
deployed across enterprises in any topology from single-site campuses to
highly distributed organizations with thousands of branches.
VCX servers run the VCX operating system and host software
components such as the Call Processor, VCX applications (such as IP
Messaging), and configuration databases. SIP-enabled endpoints include
VCX telephones and gateways which provide user access to the Public
Switched Telephone Network (PSTN)
VCX system components can be installed in different configurations
according to the features required and the number of subscribers that
must be supported. The system configuration determines the tasks you
must perform to enable communication between components.
VCX Software Components describes the VCX software components.
VCX Hardware Configurations, describes the two basic VCX
configurations, single-site and multi-site systems.
VCX Maintenance Tasks describes the general tasks required to add users,
assign phones to users, and enable communication between devices on
your VCX system.
VCX Software Components
This section describes the individual software components in a VCX
system.
A VCX system includes the following software services:
■Call Processor — Performs call processing functions and generates
Call Detail Records (CDRs).
■Authentication and Directory Service — Performs the following
tasks:
■Authentication: