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VoIP Bandwidth Utilization

When you are using Voice over IP, the used VoIP phones and PBX can use different so called codecs. The consumption of bandwidth depends on which codec you use.  The following table gives you a short overview of the bandwidth consumption of the different codecs.   VentureTel uses G.711 a/u-law as the default for ISDN quality calls, other codecs can be set as the primary if bandwidth is an issue.

codec
name
bandwidth (incl. overhead)
bandwidth for 5 concurrent calls
quality
G.711 a/u-law
PCM
80 kBit/s
512 kBit/s
ISDN
G.729
CSA-CELP
32 kbit/s
200 kBit/s
good
iLBC
iLBC
32 kBit/s
200 kBit/s
good
G.723.1
MP-MLQ
21 kbit/s
110 kBit/s
average
G.723
A-CELP
15 kbit/s
80 kBit/s
average
GSM fullrate
GSM
13 kBit/s
80 kBit/s
average
G.726
AD-PCM
55 kbit/s
386 kBit/s
GSM
SpeeX
SpeeX
4 - 15 kBit/s
25 - 80kBit/s
variable
 
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  1. Joel Eskelsen

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