Cisco WRP400-G1 Administration Guide - Page 31
ATA Software Features, Supported Codecs
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Configuring Voice Services ATA Software Features 3 Telephone/fax VV Ethernet WRP400 Internet Access Device Voice Internet gateway Service Provider VoIP Infrastructure V PSTN IP SIP proxy Phone 252075 The WRP400 maintains the state of each call it terminates and makes the proper reaction to user input events (such as on/off hook or hook flash). The WRP400 uses the Session Initiation Protocol (SIP) open standard, so there is little or no involvement by a "middle-man" server or media gateway controller. SIP allows interoperation with all ITSPs that support SIP. ATA Software Features The WRP400 is equipped with a full featured, fully programmable ATA 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," on page 29 • "SIP Proxy Redundancy," on page 30 • "Other ATA Software Features," on page 31 Supported Codecs The WRP400 supports the following codecs: • G.711u (configured by default) and G.711a G.711 (A-law and mμ-law) are very low complexity codecs that support uncompressed 64 kbps digitized voice transmissions at one through ten 5 ms voice frames per packet. This codec provides the highest voice quality and uses the most bandwidth of any of the available codecs. Cisco Small Business WRP400 Administration Guide 29