Avaya Nortel Communication Server 1000 Manual page 227

The "Best Bandwidth" codec selection is based on the codec type only; it
does not take into account the fact that some codecs, while generally using
less bandwidth, consume more bandwidth than others at certain payload
sizes.
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•
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Table 69 "Best Bandwidth codec Selection between any two codecs types"
(page 227)
codecs. For example, if the two codecs are the G.729A and G.723.1, the
selected codec is the G.729A.
Table 69
Best Bandwidth codec Selection between any two codecs types
Codec type G.711_a-Law
G.711_a-Law G.711_a-Law
G.711_mu-Law G.711_mu-Law
G.729A G.729A
G.729AB G.729AB
G.723.1 G.723.1
Copyright © 2003–2008, Nortel Networks
.
The Best Bandwidth Codec Selection algorithm finds the first codec in
the near-end list that is also in far-end list (codec is the same type and
has the same payload size). Call the selected codec C1.
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_mu-
Law, 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
shows the codec that would be selected between any two
G.711_mu-Law
G.711_muLaw
G.711_mu-Law
G.729A
G.729AB
G.723.1
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
Codec selection 227
G.729A G.729AB
G.729A G.729AB
G.729A G.729AB
G.729A G.729AB
G.729A G.729AB
B
G.729A G.729AB
G.723.1
G.723.1
G.723.1
G.729A
G.729AB
G.723.1