Avaya IPO R9 3RD PARTY TTS ADI LIC 275616 Manuel D’Utilisation
Codes de produits
275616
Product Description
IP Office 9.0
IP Office 9.0
© 2014 AVAYA All rights reserved.
Page 291
Issue 27.02.0 (Monday, January 06, 2014)
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.
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.
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.
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
RTP Voice
Data Payload
Packets
per
Second
LAN
(bps)
% Overhead
LAN
WAN
(bps)
% Overhead
WAN
Algorithmi
c Delay
(milli-
seconds)
G.723.1 (6.3K)
24 Bytes
33.33
20,800
225%
9,867
54%
80
G.729a
20 Bytes
50
29,600
270%
13,200
65%
40
G.711 (64K)
160 Bytes
50
85,600
34%
69,200
8%
20
G.722 (64K)
160 Bytes
50
85,600
34%
69,200
8%
20
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
Pixels
Typical Net Video
Bandwidth Requirement
Bandwidth Requirement
H.263
H.264
Low
176 x 144 (QCIF)
64 kbps
45 kbps
Standard
320 x 200 (QVGA)
162 kbps
114 kbps
High
640 x 480 (VGA)
776 kbps
545 kps
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.
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.
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.