Inter-Tel AXXESS Manual page 165

7.13 The CodecBW and VoiceFrameSize values for each of the supported vocoders are listed
in the following table.
Voice Over IP
(EthHeadSize + IP/UDPHeadSize + RTPHeadSize) x 8 bits/byte
Bandwidth
=
in each direction AudioFramesPerIPPacket x VoiceFrameSize (10ms for G.729)
Voice Over IP Across Frame Relay
(FrameHeadSize + IP/UDPHeadSize + RTPHeadSize) x 8 bits/byte
Bandwidth
=
in each direction AudioFramesPerIPPacket x VoiceFrameSize (10ms for G.729)
7.14 For example, using the default settings (G.729, three audio frames per packet, and Inter-
Tel RTP) and including Ethernet overhead, the bandwidth for 32 concurrent voice over IP calls
would result in the following:
(18 + 28 + 4) bytes x 8 bits/byte
Bandwidth Utilization
®
INTER-TEL AXXESS
Table 2-21.
Codes Bandwidth and Voice Frame Size
Voice Codec
Codec Bandwidth
G.729 8 kbps
G.711 64 kbps
+ (CodecBW + BurstDataPerCall)
+ (8 kbps + 10 kbps) x 32 calls = 1002.7 kbps
3 x 10 ms
®
MANUAL VERSION 11.0 – May 2008
Voice Frame
Size
10 ms
10 ms
x #Calls + BurstDataDB
+ (CodecBW + BurstDataPerCall) x #Calls + BurstDataDB
Specifications
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