Understanding Voice Service Operations; Ata Voice Features - Cisco SPA232D Administration Manual

Getting Started
Feature Overview
Cisco SPA232D Administration Guide

Understanding Voice Service Operations

The ATA allows calls to be made by using SIP-based Voice-over-IP (VoIP) services
and traditional telephone Public Switched Telephone Network (PSTN) services.
Calls can be placed and received by using an analog phone or fax machine and
Cisco SPA302D handsets.
SPA232D typical topology
Analogue
Phone
IP
(FXS port)
or
Cordless
Phone
(DECT)
or
Fax Machine
(FXS port)
The ATA maintains the state of each call and makes the proper reaction to user
input events (such as on/off hook or hook flash). Because the ATA uses the Session
Initiation Protocol (SIP), it is compatible with most Internet Telephony Service
Provider (ITSP) offerings.

ATA Voice Features

The ATA can be custom provisioned within a wide range of configuration
parameters. The following sections describe the factors that contribute to voice
quality:
• Supported Codecs
• SIP Proxy Redundancy
• Other ATA Voice Features
Internet Service Provider
Internet (ADSL/Cable
Modem)
WAN
FXS/DECT
Cisco SPA232D
LAN
PC
1
FXO
Active PSTN L
6