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Available voice codecs 664
SmartWare Software Configuration Guide E • Used IP ports & available voice codecs
Available voice codecs
Protocol Codec
Net Band-
width per
Call (kbps)
Min.
Compression
Delay (ms)
Used Band-
width per
Call (kbps,
incl. IP
header)
Usage
H.323
& SIP
G.711 A-law 64 10 96 Uncompressed, best voice qual-
ity, European audio-digitizing
G.711 U-law 64 10 96 Uncompressed, best voice qual-
ity, American audio-digitizing
G.723.1 6.3 30 17 Good voice quality at lowest
bandwidth, like analog phone,
acceptable delay
G.729/
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
G.726 16, 24, 32, 40 20 32, 40, 48, 56 The G.726 is an ADPCM based
codec, with small memory foot-
print but fairly high CPU time
requirements. Also available in
Cisco compatible mode.
G.727 16, 24, 32 20 32, 40, 48 Embedded ADPCM. See also
G.726.
T.38 Variable This is a fax codec, not a
voice codec.