Overview - Linksys SPA1001 Administrator User Manual

Configuring the PSTN Gateway (FXO)
This chapter describes how to configure the PSTN gateway provided by Analog Telephone Adapters
(ATAs) with one or more FXO ports, which includes the AG310 and SPA3102. It includes the following
sections:
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Througout this chapter, when references are made to the software configuration of the SPA3102, the
Note
information also applies to the AG310. The AG310 provides the same functionality as the SPA3102, as
well as an ADSL modem and a four-port Ethernet switch.

Overview

The SPA3102 and AG310 have the following ports for connection to telephony devices:
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Line 1 does not provide a gateway because it provides only VoIP service. The VoIP-To-PSTN calling
function is referred to as a PSTN gateway, and PSTN-To-VoIP calling function as a VoIP gateway. Note
the following definitions:
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Document Version 3.1
Overview, page 4-1
How VoIP-To-PSTN Calls Work, page 4-2
How PSTN-To-VoIP Calls Work, page 4-4
Configuring VoIP Failover to PSTN, page 4-7
Sharing One VoIP Account Between the FXS and PSTN Lines, page 4-7
Other Options, page 4-7
Call Scenarios, page 4-8
FXS port (Phone)—Connected to a standard analog telephone or fax machine, configured using the
Line tab
FXO port (Line)—Connected to a standard telephone wall jack for connectivity to the PSTN,
configured using the PSTN Line tab
VoIP caller—One who calls the AG310 via VoIP to obtain PSTN service
VoIP user—VoIP caller that has a user account (user-id and password) on the AG310
PSTN caller—One who calls the AG310 from the PSTN to obtain VoIP service
C H A P T E R
Linksys ATA Administrator Guide
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4-1