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Cisco Small Business ATA Administration Guide 87
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 87
How VoIP-To-PSTN Calls Work section on page 88
How PSTN-To-VoIP Calls Work section on page 90
Configuring VoIP Failover to PSTN section on page 93
Sharing One VoIP Account Between the FXS and PSTN Lines (SPA3102)
section on page 93
Other Options section on page 94
Call Scenarios section on page 95
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 , as well as a
PSTN-To-VoIP calling function, which is referred to as a .
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.
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