Avaya IP Telephony Konfigurationsanleitung Seite 146
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146 Efficient Networking
P0604630 03
organizations the thresholds can be lower than those used in this example. In the event of link
failures, spare capacity for rerouting traffic is required.
Some WAN links can exist on top of layer 2 services, such as Frame Relay and Asynchronous
Transfer Mode (ATM). The router-to-router link is a virtual circuit, which is subject not only to a
physical capacity limits, but also to a logical capacity limit. The installer or administrator needs to
obtain the physical link capacity and the QoS parameters. The important QoS parameters are CIR
(committed information rate) for Frame Relay, and MCR (maximum cell rate) for Asynchronous
Transfer Mode (ATM).
The difference between the current capacity and the acceptable limit is the available capacity. For
example, a T1 link used at 48% during the peak hour with a planning limit of 85% has an available
capacity of approximately 568 kbit/s.
Network engineering
This section describes some network engineering criteria that you need to consider for your
system:
• “Bandwidth requirements on half duplex links” on page 148
• “Bandwidth requirements on full duplex links” on page 149
• “LAN engineering examples” on page 150
• “WAN engineering” on page 150
• “QoS Monitoring Bandwidth Requirement” on page 151
Engineer the network for worst-case numbers to indicate the spare bandwidth a LAN must have to
handle peak traffic. It is important to plan so that the LAN/WAN can handle the IP telephony
traffic using the defined codec without delay or packet loss. The installer or administrator must
select one configuration and then set up the LAN/WAN so there is more bandwidth than the IP
telephony output.
The following table provides bandwidth characteristics for the transmission of voice over IP for
various link types given codec type and payload sizes. The bandwidths provided in this table
explain the continuous transmission of a unidirectional media stream.
Table 38 VoIP Transmission Characteristics for unidirectional continuous media stream
Codec Type Payload Size IP Packet Ethernet B/W
2
PPP B/W FR B/W
ms Bytes Bytes kbit/s kbit/s kbit/s
G. 7 11
(64 kb/s)
10 80 120 116.8 97.6 103.2
20* 160* 200* 90.4* 80.8* 83.6*
30 240 280 81.6 75.2 77.1
G. 7 29
(8 kb/s)
10 10 50 60.8 41.6 47.2
20* 20* 60* 34.4* 24.8* 27.6*
30 30 70 25.6 19.2 21.1
- Business Communications 1
- Manager 3.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Chapter 6 5
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 15
- Related publications 16
- How to get help 17
- APAC (Asia Pacific) 18
- Technical Support - CTAS 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 31
- Figure 2 Global IP settings 33
- VoIP trunks 36
- IP telephone records 37
- Chapter 3 39
- Installing IP telephones 39
- Choosing a codec 43
- Choosing a Jitter Buffer 43
- Before installing 44
- Using a 3-port switch 44
- Other troubleshooting tips 49
- Configuring DHCP 50
- IP telephony DHCP notes 51
- Checking IP server status 53
- Figure 7 IP Terminal status 54
- 6 Click the Save button 55
- Using the Hot Desking feature 58
- Notes about Hot Desking 59
- Customizing feature labels 60
- Moving IP telephones 65
- Figure 16 i2050 Switch type 68
- Access points 70
- Handset and call functions 70
- Configuring NetVision records 71
- Assigning general settings 72
- Testing the handset functions 76
- Changing a handset Name 78
- Deregistering a telephone 79
- Configuring local VoIP trunks 81
- Published IP address 82
- Configuring media parameters 85
- Setting up the local gateway 87
- P0604630 03 100
- Outgoing call configuration 101
- PSTN call to remote node 103
- Call process 104
- Describing a fallback network 106
- Figure 34 Route XXX screen 108
- Figure 35 VoIP schedule 110
- How it works 112
- Setting up the VoIP schedule 114
- Connecting an i200X telephone 119
- Quality of Service Monitor 120
- PSTN fallback metrics 121
- Chapter 7 123
- Modifying PortRanges 125
- Using a gatekeeper 127
- Gatekeeper call scenarios 133
- Faxing over VoIP lines 134
- Chapter 8 139
- WarehouseHead Office 140
- Appendix A 145
- Efficient Networking 145
- Network engineering 146
- LAN engineering examples 150
- WAN engineering 150
- (8 kb/s) 151
- Setting Non-linear processing 152
- Enough link capacity 155
- Not enough link capacity 155
- Further network analysis 156
- Reduce link delay 157
- Reducing hop count 157
- Routing issues 158
- Appendix B 161
- Silence compression 161
- Time -> 163
- Bandwidth -> 163
- Channel/Link Max 163
- Comfort noise 166
- Appendix C 167
- Network performance utilities 167
- Appendix D 169
- Interoperability 169
- Speech path setup methods 170
- Media path redirection 171
- Gatekeeper 171
- No feedback busy station 172
- Interoperability 173 173
- 174 Interoperability 174
- Using VLAN on the network 175
- 176 Interoperability 176
- Symbol NetVision telephones 177
- 178 Interoperability 178
- Interoperability 179 179
- 180 Interoperability 180
- Interoperability 181 181
- 182 Interoperability 182
- Appendix E 183
- Quality of Service 183
- 184 Quality of Service 184
- Measuring Intranet QoS 185
- Recording routes 186
- Adjusting Ping measurements 187
- Measurement procedure 188
- Quality of Service 189 189
- Traffic mix 190
- TCP traffic behavior 190
- Network Quality of Service 191
- Network monitoring 192
- Quality of Service parameters 192
- Fallback to PSTN 193
- 194 Quality of Service 194
- Glossary 195
- 196 Glossary 196
- Glossary 197 197
- 198 Glossary 198
- Glossary 199 199
- 200 Glossary 200
- Glossary 201 201
- 202 Glossary 202
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