Cisco SPA2102-SF Administration Guide - Page 16

1 Introducing Cisco Small Business Analog Telephone Adapters This guide describes the administration and use of Cisco Small Business analog telephone adapters (ATAs). These ATA devices are a key element in the end-toend IP Telephony solution. An ATA device provides user access to Internet phone services through one or more standard telephone RJ-11 phone ports using standard analog telephone equipment. The ATA device connects to a wide area IP network, such as the Internet, through a broadband (DSL or cable) modem or router. The ATA can be used with an onsite call-control system such as the SPA9000 Voice System or legacy PBX, or with an Internet-based call-control system. Figure 1 ATA Deployment without Onsite Call Control Telephone/fax V Ethernet Broadband Linksys ATA Broadband CPE (DSL, cable, fixed wireless) Layer 3 IP infrastructure Voice gateway V PSTN SIP proxy 187254 Cisco Small Business ATA Administration Guide 16