Appendix C
357
Software Configuration Guide Release 2.10, Revision 1.00
36.2 Available Voice Codecs in SmartWare 2.10
Protocol Codec
Net Band-
width per
Call (kbps)
Min. Com-
pression
Delay
(ms)
Used Band-
width per
Call (kbps,
incl. IP
header)
Usage
ISoIP G.711
A-
Law
64
10
96
Uncompressed, best voice
quality, European audio-
digitizing
G.711
u-
Law
64
10
96
Uncompressed, best voice
quality, American audio-
digitizing
G.726
16, 24, 32,
40
20
32, 40, 48,
56
The G.726 is an ADPCM
based codec, with small
memory footprint but fairly
high CPU time
requirements.
G.727
16, 24, 32
20
32, 40, 48
Embedded ADPCM. See
also G.726
G.723.1
5.3, 6.3
30
16, 17
Good voice quality at lowest
bandwidth, like analog
phone, acceptable delay
G.729a
8
10
40
Best relationship between
voice quality and used
bandwidth, low delay
Netcoder
6.4, 9.6
20
22.4, 25.6
License free low bandwidth
codec comparable to G.723
Transparent 64
10
96
Transparent ISDN data, no
echo cancellation
H.323
G.711 A-law 64
10
96
Uncompressed, best voice
quality, European audio-
digitizing
G.711 U-law 64
10
96
Uncompressed, best voice
quality, American audio-
digitizing
G.723.1
6.3
30
17
Good voice quality at lowest
bandwidth, like analog
phone, acceptable delay
G.729a
8
10
40
Best relationship between
voice quality and used
bandwidth, low delay
Transparent 64
10
96
Transparent ISDN data, no
echo cancellation
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