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120 Quality of Service
P0937663 02.0
If QoS levels of some or all routes fall short of being Good, evaluate options and costs for
upgrading the intranet. The evaluation often requires a link upgrade, a topology change, or
implementation of QoS in the network.
To maintain costs, you can accept a Fair QoS level for the time for a selected route. A calculated
trade-off in quality requires the installer or administrator monitor the QoS level, reset needs with
the end users, and respond to user feedback.
Implementing QoS in IP networks
Corporate intranets are developed to support data services. Accordingly, normal intranets are
designed to support a set of QoS objectives dictated by these data services.
When an intranet takes on a real-time service, users of that service set additional QoS objectives in
the intranet, Some of the targets can be less controlled compared with the targets set by current
services, while other targets are more controlled. For intranets not exposed to real-time services in
the past, but which but now need to deliver IP telephony traffic, QoS objectives for delay can set an
additional design restriction on the intranet.
One method is to subject all intranet traffic to additional QoS restrictions, and design the network
to the strictest QoS objectives. A exact plan to the design improves the quality of data services,
although most applications cannot identify a reduction of, say, 50 ms in delay. Improvement of the
network results in a network that is correctly planned for voice, but over planned for data services.
Another plan is to consider using QoS in the intranet. This provides a more cost-effective solution
to engineering the intranet for non-homogenous traffic types.
Traffic mix
This section describes QoS works with the IP telephony, and what new intranet-wide results can
occur.
Before putting into operation QoS in the network, determine the traffic mix of the network. QoS
depends on the process and ability to determine traffic (by class) so as to provide different services.
With an intranet designed only to deliver IP telephony traffic, where all traffic flows are equal
priority, there is no need to consider QoS. This network can have one class of traffic.
In most corporate environments, the intranet supports data and other services. When planning to
provide voice services over the intranet the installer determine the following:
• Is there existing QoS? What kind? IP telephony traffic must take advantage of established
mechanisms if possible.
• What is the traffic mix? If the IP telephony traffic is light compared to data traffic on the
intranet, then IP QoS can work. If IP telephony traffic is heavy, data services can be affected if
QoS is biased toward IP telephony traffic.
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Appendix A 5
- Before you begin 13
- Symbols used in this guide 14
- Text conventions 14
- Acronyms 15
- UDP User Datagram Protocol 16
- WAN Wide Area Network 16
- Related publications 17
- How to get help 18
- Chapter 1 19
- Introduction 19
- The IP telephony network 20
- Chapter 1 Introduction 21 21
- Figure 1 Network diagram 21
- Telephones 22
- IP Network 22
- Key IP Telephony Concepts 23
- Jitter Buffer 24
- QoS routing 24
- Chapter 1 Introduction 25 25
- 26 Chapter 1 Introduction 26
- Chapter 2 27
- Prerequisites checklist 27
- Network assessment 28
- Resource Assessment 28
- Keycodes 29
- IP Telephones 30
- Chapter 3 31
- Installing IP Telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 33
- Before Installing 34
- Manual Cfg DHCP(0 no, 1 yes) 35
- Configuring DHCP 38
- Figure 4 DHCP summary 39
- Figure 5 DHCP range 40
- Figure 6 IP Terminal status 41
- Figure 7 Configuration menu 42
- Figure 9 IP Terminal Status 43
- Download Pending 44
- Deregistering offline DNs 45
- Moving IP telephones 46
- H.323 devices 47
- 4 Click the Save button 49
- VoIP Trunk Configuration 51
- Configuring media parameters 53
- Configuring codecs 54
- Setting Silence Compression 54
- Setting Jitter Buffers 55
- Outgoing call configuration 56
- Figure 21 Trunk/Line data 57
- Figure 22 Line pool 58
- Configuring a remote gateway 59
- Configuring PSTN fallback 60
- Setting up a VoIP schedule 61
- Vo I P 62
- Configuring routes 63
- Figure 28 Route list 64
- Figure 29 Add route dialog 64
- Creating a destination code 65
- Figure 32 Normal schedule 66
- Configuring digits 67
- Activating the VoIP schedule 67
- Turning on QoS monitor 68
- Incoming call configuration 70
- Example configuration 71
- Making calls 74
- Connecting an i200X telephone 75
- Quality of Service Monitor 77
- Port settings 77
- Using firewalls 78
- Using a gatekeeper 80
- Gatekeeper call scenarios 82
- Typical applications 85
- MCDN functionality 86
- Networking 91
- Network Engineering 92
- Networking 93 93
- (64 kb/s) 93
- (5.3 kb/s) 93
- LAN Engineering Examples 95
- WAN engineering 96
- Setting Non-linear processing 96
- Networking 97 97
- Traceroute 97
- Enough link capacity 98
- Not enough link capacity 98
- Implementing the network 99
- Further network analysis 99
- Reduce link delay 100
- Reducing hop count 100
- Adjust the jitter buffer size 101
- Reduce packet errors 101
- Routing issues 102
- Silence compression 103
- Appendix B 103
- 104 Silence compression 104
- P0937663 02.0 104
- Silence compression 105 105
- 106 Silence compression 106
- Silence compression 107 107
- Comfort Noise 108
- Appendix C 109
- Network Performance Utilities 109
- Appendix D 111
- Interoperability 111
- Speech Path Setup Methods 112
- Media Path Redirection 112
- Gatekeeper 113
- Symbol Telephones 114
- Appendix E 115
- Quality of Service 115
- Measuring Intranet QoS 116
- Recording routes 117
- Adjustment for processing 118
- Late packets 118
- Quality of Service 119 119
- Traffic mix 120
- Network Quality of Service 121
- Packet loss 122
- Packet delay 122
- Delay variation (jitter) 123
- 124 Quality of Service 124
- Glossary 125
- 126 Glossary 126
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