Cisco SPA2102-SF Administration Guide - Page 27

Introducing Cisco Small Business Analog Telephone Adapters ATA Software Features 1 You can configure your preferred codec in Configuration Utility. See "SDP Payload Types section," on page 134 and "Audio Configuration section," on page 174. See also "Supported Codecs," on page 54 for a list of which codecs are supported on each ATA device. Codec (Voice Compression Description Algorithm) G.711 (A-law and mμ-law) This very low complexity codec supports uncompressed 64 kbps digitized voice transmission 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. G.726 This low complexity codec supports compressed 16, 24, 32, and 40 kbps digitized voice transmission at one through ten 10 ms voice frames per packet. This codec provides high voice quality. G.729a The ITU G.729 voice coding algorithm is used to compress digitized speech. Cisco supports G.729. G.729a is a reduced complexity version of G.729. It requires about half the processing power to code G.729. The G.729 and G.729a bit streams are compatible and interoperable, but not identical. G.723.1 The ATA device supports the use of ITU G.723.1 audio codec at 6.4 kbps. Up to two channels of G.723.1 can be used simultaneously. For example, Line 1 and Line 2 can be using G.723.1 simultaneously, or Line 1 or Line 2 can initiate a three-way conference with both call legs using G.723.1. NOTE When no static payload value is assigned per RFC 1890, the ATA device can support dynamic payloads for G.726. Cisco Small Business ATA Administration Guide 27