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116 Silence compression
P0937663 03.1
When several calls are made over a full duplex link, all calls share the same transmit path and they
share the same receive path. Since the calls are independent, the peak bandwidth must account for
the possibility that all speakers at one end of the link may talk at the same time. Therefore the peak
bandwidth for n calls is n * the full transmission rate. Figure 49 shows the peak bandwidth
requirements for two calls on a full duplex link with silence compression. Note that the peak
bandwidth is twice the full transmission rate even though the average bandwidth is considerably
less.
The spare bandwidth made available by silence compression is available for lower priority data
applications that can tolerate increased delay and jitter.
Figure 49 Two Calls on a Full Duplex Link With Silence compression
Comfort noise
To provide a more natural sound during periods of silence, comfort noise is added at the
destination gateway when silence compression is active. The source gateway sends information
packets to the destination gateway informing it that silence compression is active and describing
the background comfort noise to insert. The source gateway only sends the information packets
when it detects a significant change in background noise.
Time ->
Bandwidth ->
Bandwidth Used
Time ->
Bandwidth ->
Tx ChanRx Chan
Independent Tx and Rx bandwidth
not shared by “half-duplex” calls.
Peek channel bandwidth is
n * peek bandwidth per call.
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!
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?
Channel Max
Channel Max
Hello Fred. This is Susan.
Do you have a minute?
Fred here.
Hi!
Sure!
Conversation
Bandwidth used
Peak channel bandwidth is n * peak
bandwidth per call
Time
Channel/Link max
Tx
Rx
Tx
Rx
Buenos noches Juan
Muy bien, y tu?
Hola Isabella
Com o estas?
Independent Tx and Rx bandwidth not
shared by half-duplex calls
Time
Channel/Link max
Tx channel
Bandwidth
Rx channel
Bandwidth
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Chapter 6 6
- Appendix A 6
- 12 Tables 12
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 14
- Related publications 15
- How to get help 16
- Chapter 1 17
- Introduction 17
- IP telephones and VoIP trunks 18
- Figure 1 Network diagram 19
- Telephones 20
- IP network 21
- Key IP telephony concepts 22
- Jitter Buffer 23
- QoS routing 23
- Chapter 2 25
- Prerequisites checklist 25
- Network assessment 26
- Resource assessment 27
- Keycodes 27
- Defining published IP address 28
- IP telephones 30
- NetVision wireless telephones 30
- Chapter 3 31
- Installing IP telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 34
- Before installing 34
- Using a 3-port switch 35
- NORTEL NETWORKS 36
- Manual Cfg DHCP(0 no, 1 yes) 36
- Field Value Description 37
- Slow connection 40
- One-way or no speech paths 40
- Dropped voice packets 40
- Changing the contrast level 40
- Configuring DHCP 41
- Figure 5 IP Terminal status 42
- Figure 6 Configuration menu 42
- Figure 8 Configuration menu 44
- Download Pending 44
- Customizing feature labels 46
- Moving IP telephones 47
- Keep DN alive 48
- Figure 12 i2050 Switch type 49
- 7 Click on the BCM option 50
- Configuring NetVision records 52
- /symbol.com> 53
- <http:/ 53
- Testing the handset functions 55
- Changing a handset Name 57
- Configuring VoIP trunks 59
- Configuring media parameters 60
- Setting silence compression 61
- Setting jitter buffers 62
- Outgoing call configuration 63
- Figure 18 Trunk/Line data 64
- Configuring a remote gateway 66
- Configuring PSTN fallback 68
- Enabling PSTN fallback 69
- Setting up the VoIP schedule 69
- Configuring routes 70
- Figure 26 VoIP schedule 73
- Activating the VoIP schedule 74
- Turning on QoS monitor 75
- Incoming call configuration 76
- Example configuration 78
- Making calls 82
- Connecting an i200X telephone 83
- Quality of Service Monitor 86
- Port settings 86
- Using firewalls 87
- Using a gatekeeper 88
- The call signaling method 89
- Gatekeeper call scenarios 91
- Typical applications 93
- Setting up the system 95
- Efficient Networking 99
- Network engineering 100
- LAN engineering examples 103
- WAN engineering 104
- Setting Non-linear processing 105
- (8 kb/s) 106
- P0937663 03.1 106
- Traceroute 106
- Enough link capacity 107
- Not enough link capacity 107
- Further network analysis 108
- Reduce link delay 109
- Reducing hop count 109
- Adjust the jitter buffer size 110
- Reduce packet errors 110
- Routing issues 111
- Appendix B 113
- Silence compression 113
- Comfort noise 116
- Appendix C 117
- Network performance utilities 117
- Appendix D 119
- Interoperability 119
- Speech path setup methods 120
- Media path redirection 120
- Gatekeeper 120
- Symbol NetVision telephones 121
- 122 Interoperability 122
- Appendix E 123
- Quality of Service 123
- Measuring Intranet QoS 124
- Recording routes 125
- Adjusting Ping measurements 126
- Measurement procedure 127
- 128 Quality of Service 128
- Traffic mix 129
- TCP traffic behavior 129
- Network Quality of Service 130
- Quality of Service parameters 131
- Fallback to PSTN 132
- Glossary 133
- 134 Glossary 134
- Glossary 135 135
- 136 Glossary 136
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