Cisco SPA2102-SF Administration Guide - Page 92

6 Configuring the PSTN (FXO) Gateway on the SPA3102 This chapter describes how to configure the PSTN gateway on the SPA3102 and the SPA8800. • "Connecting to PSTN and VoIP Services" section on page 92 • "How VoIP-To-PSTN Calls Work" section on page 93 • "How PSTN-To-VoIP Calls Work" section on page 95 • "Configuring VoIP Failover to PSTN" section on page 98 • "Sharing One VoIP Account Between the FXS and PSTN Lines (SPA3102)" section on page 98 • "Other Options" section on page 99 • "Call Scenarios" section on page 100 Connecting to PSTN and VoIP Services Both the SPA3102 and the SPA8800 allow your analog and IP phones to participate in calls over the VoIP network and the PSTN. Both devices provide a VoIP-To-PSTN calling function, which is referred to as a PSTN gateway, as well as a PSTN-To-VoIP calling function, which is referred to as a VoIP gateway. These ATAs function somewhat differently because they are designed to meet different business needs. • The SPA3102 is designed to work independently as a PSTN gateway and VoIP gateway, without relying on a PBX for call control. - FXS Port: The SPA3102 has 1 FXS port that you can connect to a standard analog telephone or fax machine. Configure the FXS settings by using the SPA3102 Line page. Cisco Small Business ATA Administration Guide 92