Cisco SPA122 Administration Guide - Page 35
Understanding Voice Port Operations, ATA Voice Features, Configuring Voice, Supported Codecs - voip gateway
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Configuring Voice Getting Started with Voice Services 4 Understanding Voice Port Operations The ATA allows calls to be made from locally connected analog handsets or fax machines by using SIP-based Internet phone services. Telephone/fax VV Services Ready Platform Ethernet Voice Internet gateway Service Provider VoIP Infrastructure V PSTN IP SIP proxy Phone 236741 The ATA maintains the state of each call made through the PHONE port and makes the proper reaction to user input events (such as on/off hook or hook flash) Because the ATA uses the Session Initiation Protocol (SIP), it is compatible with most Internet Telephony Service Provider (ITSP) offerings. ATA Voice Features The ATA is equipped with fully featured, programmable voice ports that can be custom provisioned within a wide range of configuration parameters. The following sections describe the factors that contribute to voice quality: • Supported Codecs • SIP Proxy Redundancy • Other ATA Voice Features Cisco SPA100 Series Phone Adapters Administration Guide 35