[Ata] Analog Telephone Overview - AT&T SB67030 Administrator's Manual

Synapse Administrator's Guide

[ATA] Analog Telephone Overview

The FXS ports can provide plain old telephone service (POTS) support for up to two analog phones. Even though ATA extensions
do not appear in the Deskset extension list, these extensions can be directly dialed. A connected analog phone can pick up
incoming calls and make outgoing calls. Caller ID should work on analog sets that support it.
Advanced system features such as Hold, Call Forward, and Transfer are not supported on analog phones.
System Configuration 161