Avaya IP Office 8.1 Product Description page 273

When a call is connected:
If the IP devices use the same audio codec no voice compression channel is used.
·
If the devices use differing audio codecs, a voice compression channel is required for each.
·
"Direct Media" is a VoIP concept that circumvents resources (TDM bus, Gateway) within the system and
improves the voice quality. If two IP devices are connected on the same system, a direct LAN connection
between them will be established once the call has been set up (as long as they use the same Codecs). Direct
media is supported between Avaya IP telephones and SIP telephones.
It is possible for an IP device to be physically located at one site while being registered at a different site. In
this case, even for VoIP across the WAN the VCM would not be used, as long as the two IP devices involved in a
phone call are registered on the same system.
Bandwidth Required For Each Voice Call?
The bandwidth used varies depending on the compression method chosen. IP Office supports standards listed
below. These will occupy approximately 10K and 13K of bandwidth respectively.
Use the following chart to choose the most appropriate compression algorithm for your available bandwidth.
Audio Codec
G.723.1 (6.3K)
G.729a
G.711 (64K)
G.722 (64K)
Typical Bandwidth Required For Video Calls
This is for Video transmit only. To the Video part, the audio channel needs to be added.
· Video bandwidth needed per call (transmit and receive, Audio bandwidth not included) as sample for the
Avaya 1010-1040 for HD-Video:
· 1010/1020: 1 Mbps for 720p/30fps
Typical Bandwidth for standard Video quality, for example with IP Office Video Softphone.
Resolution
Low
Standard
High
Acceptable Delay?
End-to-end delay should be 150 milliseconds or below.
How Many Simultaneous Calls Can I Get Down My Link?
The following chart illustrates the theoretical maximum number of simultaneous voice calls that can be
delivered over a WAN for a given link speed. This does not take into account any bandwidth that may be
required for data traffic between sites or the physical limit of VoIP calls for the specific version of IP Office in
use.
The number of simultaneous voice calls can be in excess of the capabilities of the individual platform, where the
calls transit the switch as data traffic. In this situation compression resources are not used but obviously must
be catered for in the overall bandwidth provision.
Product Description
IP Office 8.1
Packets
RTP Voice
per
Data Payload
Second
24 Bytes 33.33
20 Bytes 50
160 Bytes 50
160 Bytes 50
Pixels
176 x 144 (QCIF)
320 x 200 (QVGA)
640 x 480 (VGA)
© 2012 AVAYA All rights reserved.
LAN % Overhead
(bps) LAN
20,800 225%
29,600 270%
85,600 34%
85,600 34%
Typical Net Video Bandwidth
Requirement
H.263 H.264
64 kbps 45 kbps
162 kbps 114 kbps
776 kbps 545 kps
Algorithmic
WAN % Overhead
(bps) WAN
seconds)
9,867 54%
13,200 65%
69,200 8%
69,200 8%
Issue 26.k.- (16 August 2012)
Delay
(milli-
80
40
20
20
Page 273