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Quality of Service 155
IP Telephony Configuration Guide
When the QoS level of any remote gateway is below the fallback threshold, all new calls are
routed over the standard circuit-switched network, if fallback is enabled.
The computation is taken from the ITU-T G.107 Transmission Rating Model.
Measuring Intranet QoS
Measure the end-to-end delay and error characteristics of the current state of the intranet. These
measurements help to set accurate QoS needs when using the corporate intranet to carry voice
services.
This section provides information about:
• “Measuring end-to-end network delay” on page 155
• “Measuring end-to-end packet loss” on page 156
• “Recording routes” on page 156
• “Adjusting Ping measurements” on page 157
• “Measurement procedure” on page 158
• “Other measurement considerations” on page 158
Measuring end-to-end network delay
The basic tool used in IP networks to get delay measurements is the Ping program. Ping takes a
delay sample by sending a series of packets to a specified IP address and then returning to the
originating IP address. Ping then displays statistics for the packets. High packet times can indicate
network congestion. If the packets time out, then the remote device is unreachable.
The round trip time (rtt) is indicated by the time field
So that the delay sample results match what the gateway experiences, both the Ping host and target
must be on a functioning LAN segment on the intranet.
Set the size of the Ping probe packets to 60 bytes to approximate the size of probe packets sent by
IP telephony. This determines if new calls need to fall back on the circuit-switched voice facilities.
Notice from the Ping output the difference of rtt. The repeated sampling of rtt allows you to
receive a delay characteristic of the intranet. To get a delay distribution, include the Ping tool in a
script which controls the frequency of the Ping probes, which timestamps and stores the samples in
a raw data file.
The file can be analyzed by the administrator using spreadsheets and other statistics packages. The
installer can check if the intranet network management software has any delay measurement
modules which can cause a delay-distribution measurement for specific site pairs.
- 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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