Avaya BCM 2.5 IP Telephony Konfigurationsanleitung Seite 109
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IP Telephony Configuration Guide
Appendix C
Network Performance Utilities
There are two common network utilities, Ping and Traceroute. These utilities provide a method to
measure quality of service parameters. Other utilities used also find more information about VoIP
Gateway network performance.
Ping
Ping (Packet InterNet Groper) sends an ICMP (Internet Control Message Protocol) echo request
message to a host. It also expects an ICMP echo reply, which allows for the measurement of a
round trip time to a selected host. By sending repeated ICMP echo request messages, percent
packet loss for a route can be measured.
Traceroute
Traceroute uses the IP TTL (time-to-live) field to determine router hops to a specific IP address. A
router must not forward an IP packet with a TTL field of 0 or 1. Instead, a router discards the
packet and returns to the originating IP address an ICMP “time exceeded” message.
Traceroute sends an IP datagram with a TTL of 1 to the selected destination host. The first router
to handle the datagram sends back a “time exceeded” message. This message identifies the first
router on the route. Then Traceroute transmits a datagram with a TTL of 2.
Following, the second router on the route returns a “time exceeded” message until all hops are
identified. The Traceroute IP datagram has a UDP Port number not likely to be in use at the
destination (normally > 30,000). The destination returns a “port unreachable” ICMP packet. The
destination host is identified.
Traceroute
is used to measure round trip times to all hops along a route, identifying bottlenecks
in the network.
Sniffer
Sniffer is not provided with the Business Communications Manager, but it is a useful tool for
diagnosing network functionality. It provides origin, destination, and header information of all
packets on the data network.
Note: Because data network conditions can vary at different times, collect
performance data over at least a 24 hour time period.
- 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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