Page 302 of 910 Codecs
553-3001-365 Standard 4.00 August 2005
• Find the first codec in the far-end list that is also in the near-end list (same
type, same payload size). Call this codec C2.
• The C1 and C2 codec that is selected is considered to be the BB codec
type. To determine which codec type is Best Bandwidth, the following
rules are used:
— a G.729AB codec is considered BB compared to G.729A, G.723.1,
G.711_mu-Law, and G.711_a-Law codecs
— a G.729A codec is considered BB compared to
G.723.1,G.711_muLaw, and G.711_aLaw codecs
— a G.723.1 codec is considered BB compared to a G.711_mu-Law
and G.711_a-Law codec
— a G.711_mu-Law codec is considered BB compared to a
G.711_a-Law codec
Table 56 shows the codec that would be selected between any two codecs. For
example, if the two codecs are the G.729A and G.723.1, the selected codec is
the G.729A.
Table 56
Best Bandwidth codec Selection between any two codecs types
Codec type G.711_a-Law G.711_mu-Law G.729A G.729AB G.723.1
G.711_a-Law G.711_a-Law G.711_muLaw G.729A G.729AB G.723.1
G.711_mu-Law G.711_mu-Law G.711_mu-Law G.729A G.729AB G.723.1
G.729A G.729A G.729A G.729A G.729AB G.729A
G.729AB G.729AB G.729AB G.729AB G.729AB G.729AB
G.723.1 G.723.1 G.723.1 G.729A G.729AB G.723.1