Linksys SPA922 Cisco Small Business IP Phone SPA9X1 Administration Guide - Page 17
Codec Voice Compression, Algorithm, Description, Table 1-3, Codecs Supported by Linksys IP Phones
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Feature Descriptions Chapter 1 Introducing Linksys IP Phones The administrator can select the low-bit-rate codec used for each line. G.711a and G.711u are always enabled. Table 1-3 describes the codecs supported by the Linksys IP phones. Table 1-3 Codecs Supported by Linksys IP Phones Codec (Voice Compression Algorithm) G.711 (A-law and mµ-law) G.726 G.729A G.723.1 Description 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. 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. The ITU G.729 voice coding algorithm is used to compress digitized speech. Linksys 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. Linksys IP phones support 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. When no static payload value is assigned per RFC 1890, Linksys IP phones can support dynamic payloads for G.726. Linksys IP Phone Administrator Guide 1-6 Firmware Version 5.1