Inter-Tel AXXESS - Page 165

Page 2-97
Specifications
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Bandwidth Utilization
SPECIFICATIONS
2
7.13 The CodecBW and VoiceFrameSize values for each of the supported vocoders are listed
in the following table.
Voice Over IP
Voice Over IP Across Frame Relay
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:
Table 2-21. Codes Bandwidth and Voice Frame Size
Voice
Codec
Codec
Bandwidth
Voice Frame
Size
G.729 8 kbps 10 ms
G.711 64 kbps 10 ms
Bandwidth
(EthHeadSize + IP/UDPHeadSize + RTPHeadSize) x 8 bits/byte
AudioFramesPerIPPacket x VoiceFrameSize (10ms for G.729)
+ (CodecBW + BurstDataPerCall)
in each direction
=
x #Calls + BurstDataDB
Bandwidth
(FrameHeadSize + IP/UDPHeadSize + RTPHeadSize) x 8 bits/byte
AudioFramesPerIPPacket x VoiceFrameSize (10ms for G.729)
+ (CodecBW + BurstDataPerCall)
in each direction
=
x #Calls + BurstDataDB
(18 + 28 + 4) bytes x 8 bits/byte
3 x 10 ms
+ (8 kbps + 10 kbps) x 32 calls = 1002.7 kbps