Avaya BCM 2.5 IP Telephony Guía de configuración Pagina 116
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116 Quality of Service
P0937663 02.0
The settings in Table 18 on page 116 indicate the quality of voice service. IP telephony
periodically calculates the prevailing QoS level per site pair based on the measurement of the
following:
• one-way delay
• packet loss
• codec
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.
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 return 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.
Table 18 Quality of voice service
MOS Range Qualitative Scale
4.86 to 5.00 Excellent
3.00 to 4.85 Good
2.00 to 2.99 Fair
1.00 to 1.99 Poor
- 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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