Yealink SIP-T48G Administrator's Manual

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Yealink SIP-T48G Administrator's Manual Manual pdf 205 page image

Configuring Audio Features193CODEC is an abbreviation of COmpress-DECompress, capable of coding or decoding adigital data stream or signal by implementing an algorithm. The object of the algorithmis to represent the high-fidelity audio signal with minimum number of bits while retainingthe quality. This can effectively reduce the frame size and the bandwidth required foraudio transmission.The following table lists the audio codecs supported by each phone model:Phone Model Supported Audio Codecs Default Audio CodecsSIP-T48GG722, PCMU, PCMA, G729, G726-16,G726-24, G726-32, G726-40, iLBC,G723_53, G723_63, GSMG722, PCMU, PCMA,G729SIP-T22(P)G722, PCMU, PCMA, G729, G726-16,G726-24, G726-32, G726-40, iLBC,G723_53, G723_63G722, PCMU, PCMA,G729The following table summarizes the supported audio codecs on IP phones:Codec Algorithm Reference Bit Rate Sample RateG722 G.722 RFC 3551 64 Kbps 16 KspsPCMU G.711u-lawRFC 3551 64 Kbps 8 KspsPCMA G.711a-lawRFC 3551 64 Kbps 8 KspsG729 G.729 RFC 3551 8 Kbps 8 KspsG726-16 G.726 RFC 3551 16 Kbps 8 KspsG726-24 G.726 RFC 3551 24 Kbps 8 KspsG726-32 G.726 RFC 3551 32 Kbps 8 KspsG726-40 G.726 RFC 3551 40 Kbps 8 KspsG723_53/G723_63 G.723.1 RFC 39515.3 Kbps6.3 Kbps8 KspsiLBC iLBC RFC 395213.33 Kbps15.2 Kbps8 KspsGSM GSM RFC 3551 13 Kbps 8 KspsCodecs and priorities of these codecs are configurable on a per-line basis. The attribute“rtpmap” is used to define a mapping from RTP payload codes to a codec, clock rateand other encoding parameters.