Avaya BCM 2.5 IP Telephony Guia de Configuração Página 105
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Silence compression 105
IP Telephony Configuration Guide
The affect of silence compression on half-duplex links is therefore to reduce the peak and average
bandwidth requirements by approximately 50% of the full transmission rate. Because the sender
and receiver are sharing the same bandwidth, this affect can be aggregated for a number of calls.
Figure 50 on page 105 below shows the peak bandwidth requirements for two calls on a
half-duplex link with silence compression enabled. The peak bandwidth for all calls is equal to the
sum of the peak bandwidth for each individual call. In this case, that is twice the full transmission
rate for the two calls.
Figure 50 Two Calls on a Half Duplex Link With Silence compression
Silence compression on Full Duplex Links
On full duplex links, the transmit path and the receive path are separate channels with bandwidths
usually quoted in terms of individual channels. Figure 51 on page 106 shows the peak bandwidth
requirements for one call on a full duplex link without silence compression. Because voice packets
are transmitted, even when a speaker is silent, the peak bandwidth and the average bandwidth used
is equal to the full transmission rate for both the transmit and the receive channel.
Time ->
Conversations
Bandwidth Used
Rx
Tx
Fred Here.
Hello Fred. This is Susan. Do you have a minute?
Sure!Hi!
Rx
Tx
Fred Here.
Hello Fred. This is Susan. Do you have a minute?
Sure!Hi!
Bandwidth ->
Tx + Rx Chan
Bandwidth shared by
“half-duplex” calls.
Rx
Tx
Hola Isabella!
Buenos noches Juan. Muy bien, y tu?
Como estas?
Rx
Tx
Hola Isabella!
Buenos noches Juan. Muy bien, y tu?
Como estas?
Peek channel bandwidth is
n * average bandwidth per call.
Channel/Link Max
Hello Fred. This is Susan.
Do you have a minute?
Conversation
Fred here.
Hi!
Sure!
Bandwidth used
Peak channel bandwidth is n * average
bandwidth per call.
Time
Channel/Link max
Tx + Rx Chan
Bandwidth
Tx
Rx
Tx
Rx
Buenos noches Juan
Muy bien, y tu?
Hola Isabella
Com o estas?
Bandwidth shared by half-duplex calls
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Appendix A 5
- Before you begin 13
- Symbols used in this guide 14
- Text conventions 14
- Acronyms 15
- UDP User Datagram Protocol 16
- WAN Wide Area Network 16
- Related publications 17
- How to get help 18
- Chapter 1 19
- Introduction 19
- The IP telephony network 20
- Chapter 1 Introduction 21 21
- Figure 1 Network diagram 21
- Telephones 22
- IP Network 22
- Key IP Telephony Concepts 23
- Jitter Buffer 24
- QoS routing 24
- Chapter 1 Introduction 25 25
- 26 Chapter 1 Introduction 26
- Chapter 2 27
- Prerequisites checklist 27
- Network assessment 28
- Resource Assessment 28
- Keycodes 29
- IP Telephones 30
- Chapter 3 31
- Installing IP Telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 33
- Before Installing 34
- Manual Cfg DHCP(0 no, 1 yes) 35
- Configuring DHCP 38
- Figure 4 DHCP summary 39
- Figure 5 DHCP range 40
- Figure 6 IP Terminal status 41
- Figure 7 Configuration menu 42
- Figure 9 IP Terminal Status 43
- Download Pending 44
- Deregistering offline DNs 45
- Moving IP telephones 46
- H.323 devices 47
- 4 Click the Save button 49
- VoIP Trunk Configuration 51
- Configuring media parameters 53
- Configuring codecs 54
- Setting Silence Compression 54
- Setting Jitter Buffers 55
- Outgoing call configuration 56
- Figure 21 Trunk/Line data 57
- Figure 22 Line pool 58
- Configuring a remote gateway 59
- Configuring PSTN fallback 60
- Setting up a VoIP schedule 61
- Vo I P 62
- Configuring routes 63
- Figure 28 Route list 64
- Figure 29 Add route dialog 64
- Creating a destination code 65
- Figure 32 Normal schedule 66
- Configuring digits 67
- Activating the VoIP schedule 67
- Turning on QoS monitor 68
- Incoming call configuration 70
- Example configuration 71
- Making calls 74
- Connecting an i200X telephone 75
- Quality of Service Monitor 77
- Port settings 77
- Using firewalls 78
- Using a gatekeeper 80
- Gatekeeper call scenarios 82
- Typical applications 85
- MCDN functionality 86
- Networking 91
- Network Engineering 92
- Networking 93 93
- (64 kb/s) 93
- (5.3 kb/s) 93
- LAN Engineering Examples 95
- WAN engineering 96
- Setting Non-linear processing 96
- Networking 97 97
- Traceroute 97
- Enough link capacity 98
- Not enough link capacity 98
- Implementing the network 99
- Further network analysis 99
- Reduce link delay 100
- Reducing hop count 100
- Adjust the jitter buffer size 101
- Reduce packet errors 101
- Routing issues 102
- Silence compression 103
- Appendix B 103
- 104 Silence compression 104
- P0937663 02.0 104
- Silence compression 105 105
- 106 Silence compression 106
- Silence compression 107 107
- Comfort Noise 108
- Appendix C 109
- Network Performance Utilities 109
- Appendix D 111
- Interoperability 111
- Speech Path Setup Methods 112
- Media Path Redirection 112
- Gatekeeper 113
- Symbol Telephones 114
- Appendix E 115
- Quality of Service 115
- Measuring Intranet QoS 116
- Recording routes 117
- Adjustment for processing 118
- Late packets 118
- Quality of Service 119 119
- Traffic mix 120
- Network Quality of Service 121
- Packet loss 122
- Packet delay 122
- Delay variation (jitter) 123
- 124 Quality of Service 124
- Glossary 125
- 126 Glossary 126
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