Cisco SPA1001 Administration Guide - Page 73

CH A P T E R 4 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: • 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 Note Througout this chapter, when references are made to the software configuration of the SPA3102, the 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: • 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 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: • 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 Document Version 3.1 Linksys ATA Administrator Guide 4-1