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Quality of Service 125
IP Telephony Configuration Guide
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.
Delay characteristics vary depending on the site pair and the time of day. The evaluation of the
intranet includes taking delay measurements for each site pair. If there are important changes of
traffic in the intranet, include some Ping samples during the peak hour. For a more complete
evaluation of the intranet delay characteristics, get Ping measurements over a period of at least a
week.
Measuring end-to-end packet loss
The
Ping
program also reports if the packet made its round trip correctly. Use the same
Ping
host
setup to measure end-to-end errors. Use the same packet size.
Sampling error rate, require taking multiple
Ping
samples (at least 30). An accurate error
distribution requires data collection over a greater period of time. The error rate statistic from
multiple
Ping
samples is the packet loss rate.
Recording routes
As part of the network evaluation, record routing information for all source destination pairs. Use
the Traceroute tool to record routing information. A sample of the output of the Traceroute tool
follows:
C:\WINDOWS>tracert 10.10.10.15
Tracing route to 10.10.10.15 over a maximum of 30 hops:
1 3 ms 1 ms <10 ms tftzraf1.ca.nortel.com [10.10.10.1]
2 1 ms 1 ms 1 ms 10.10.10.57
3 7 ms 2 ms 3 ms tcarrbf0.ca.nortel.com [10.10.10.2]
4 8 ms 7 ms 5 ms bcarha56.ca.nortel.com [10.10.10.15]
Trace complete.
- 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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