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IP Telephony Configuration Guide
Appendix B
Silence compression
This section describes using silence compression on half duplex and full duplex links:
• “Silence Compression on Half Duplex Links” on page 136
• “Silence compression on Full Duplex Links” on page 138
• “Comfort noise” on page 140
Silence compression reduces bandwidth requirements by as much as 50 per cent. This section
explains how silence compression functions on a Business Communications Manager network.
For information about enabling silence compression in VoIP gateways, refer to “Configuring
media parameters” on page 74.
G.723.1 and G.729, Annex B support Silence compression.
A key to VoIP Gateways in business applications is reducing WAN bandwidth use. Beyond
speech compression, the best bandwidth-reducing technology is silence compression, also known
as Voice Activity Detection (VAD). Silence compression technology identifies the periods of
silence in a conversation, and stops sending IP speech packets during those periods. Telco studies
show that in a typical telephone conversation, only about 36% to 40% of a full-duplex
conversation is active. When one person talks, the other listens. This is half-duplex. There are
important periods of silence during speaker pauses between words and phrases. By applying
silence compression, average bandwidth use is reduced by the same amount. This reduction in
average bandwidth requirements develops over a 20-to-30-second period as the conversation
switches from one direction to another.
When a voice is being transmitted, it uses the full rate or continuous transmission rate.
The effects of silence compression on peak bandwidth requirements differ, depending on whether
the link is half-duplex or full duplex.
- Business Communications 1
- Manager 3.0 1
- IP Telephony Configuration 1
- Trademarks 2
- Table of Contents 3
- Chapter 4 5
- Chapter 5 5
- 12 Tables 12
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 14
- Preface 15 15
- Related publications 16
- How to get help 16
- APAC (Asia Pacific) 17
- Technical Support - CTAS 17
- 18 Preface 18
- Chapter 1 19
- Introduction 19
- IP telephones and VoIP trunks 20
- Figure 1 Network diagram 22
- Telephones 23
- Gatekeepers on the network 24
- IP network 24
- Key IP telephony concepts 25
- Jitter Buffer 26
- QoS routing 27
- Chapter 2 29
- Prerequisites checklist 29
- Network devices 30
- Network assessment 30
- Resource assessment 31
- Keycodes 33
- Defining published IP address 35
- NetVision wireless telephones 37
- IP telephones 37
- Chapter 3 39
- Installing IP telephones 39
- 2 Select the General tab 41
- Choosing a codec 42
- Choosing a Jitter Buffer 43
- Before installing 43
- Using a 3-port switch 43
- to move forward 46
- Other troubleshooting tips 48
- Configuring DHCP 49
- IP telephony DHCP notes 50
- Checking IP server status 52
- Figure 7 IP Terminal status 53
- Using the Hot Desking feature 57
- Notes about Hot Desking 58
- Customizing feature labels 59
- Moving IP telephones 63
- Figure 15 i2050 Switch type 65
- Configuring NetVision records 68
- <http:/ 69
- /symbol.com> 69
- Testing the handset functions 71
- Changing a handset Name 72
- Configuring VoIP trunks 73
- Configuring media parameters 74
- Field Value Description 75
- Outgoing call configuration 76
- Figure 18 Trunk/Line data 77
- Configuring a remote gateway 78
- Configuring PSTN fallback 80
- Enabling PSTN fallback 81
- Setting up the VoIP schedule 82
- Configuring routes 82
- Figure 23 Add route dialog 83
- Figure 24 VoIP schedule 85
- Activating the VoIP schedule 87
- Turning on QoS monitor 87
- PSTN fallback metrics 88
- Incoming call configuration 89
- Making calls 95
- Connecting an i200X telephone 96
- Quality of Service Monitor 100
- Port settings 101
- P0993474 03 102
- Figure 33 Port Ranges 102
- Using a gatekeeper 103
- Notes about NPI-TON aliases 107
- Gatekeeper call scenarios 113
- Chapter 6 115
- WarehouseHead Office 116
- Appendix A 121
- Efficient Networking 121
- Network engineering 122
- LAN engineering examples 126
- WAN engineering 126
- (8 kb/s) 127
- Setting Non-linear processing 128
- Enough link capacity 130
- Not enough link capacity 130
- Further network analysis 131
- Reduce link delay 132
- Reducing hop count 132
- Adjust the jitter buffer size 133
- Reduce packet errors 133
- Routing issues 134
- Appendix B 135
- Silence compression 135
- Time -> 137
- Bandwidth -> 137
- Channel/Link Max 137
- Comfort noise 140
- Appendix C 141
- Network performance utilities 141
- Appendix D 143
- Interoperability 143
- Speech path setup methods 144
- Media path redirection 144
- Gatekeeper 145
- No feedback busy station 146
- Interoperability 147 147
- Using VLAN on the network 148
- Interoperability 149 149
- Symbol NetVision telephones 150
- Interoperability 151 151
- 152 Interoperability 152
- Appendix E 153
- Quality of Service 153
- 154 Quality of Service 154
- Measuring Intranet QoS 155
- Recording routes 156
- Adjusting Ping measurements 157
- Measurement procedure 158
- Quality of Service 159 159
- Traffic mix 160
- TCP traffic behavior 160
- Network Quality of Service 161
- Network monitoring 162
- Quality of Service parameters 162
- Fallback to PSTN 163
- 164 Quality of Service 164
- Glossary 165
- 166 Glossary 166
- Glossary 167 167
- 168 Glossary 168
- Glossary 169 169
- 170 Glossary 170
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