Avaya BCM 2.5 IP Telephony Guía de configuración Pagina 122
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122 Quality of Service
P0937663 02.0
The model is the reason for compression characteristics of the codecs. Each codec delivers a
different MOS for the same network quality.
Network Monitoring
The VoIP Gateway network monitoring function measures the quality of service between the local
and all remote gateways on a continuous basis. The network monitoring function exchanges UDP
probe packets between all monitored gateways to collect the network statistics for each remote
location. All the packets make a round trip from the Sender to Receiver and back to the Sender.
From this information, you can calculate the latency and loss in the network for a distinct location.
Note 1: Quality of Service monitoring is supported only on Business Communications Manager,
M1 with ITG card, and i20xx.
Note 2: The Quality of Service threshold is configurable per remote gateway.
Note 3: Fallback starts for all new originating calls if the QoS of any monitored gateway is below
its threshold.
Note 4: The fallback decision is made only at the originating gateway using the QoS thresholds
monitored at the originating gateway for the destination gateway.
VoIP Gateway allows for manual configuration of QoS thresholds, depending on the customer
preference between cost and voice quality.
Quality of Service parameters
Quality of Service depends on end-to-end network performance and available bandwidth. A
number of parameters determine the VoIP Gateway QoS over the data network. The VoIP Gateway
monitoring function can take about three minutes to respond to marginal changes in the network
condition.
Packet loss
Packet loss is the percentage of packets that do not arrive at their destination. Transmission
equipment problems, and high delay and congestion can cause packet loss. In a voice conversation,
gaps in the conversation represent packet losses. Some packet loss, less than 5%, can be acceptable
without audible degradation in voice quality.
Packet delay
Packet delay is the period between when a packet leaves and when a packet arrives at the
destination. The total packet delay time includes fixed and variable delay. Variable delay is the
more manageable delay, while fixed delay depends on the network technology. The distinct
network routing of packets are the cause of variable delays. To minimize packet delay and increase
voice quality, the gateway must be as close as possible to the network backbone (WAN) with a
minimum number of hops.
- 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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