Avaya IP Telephony Konfigurationsanleitung Seite 100
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100 Efficient Networking
P0937663 03.1
Some WAN links can exist on top of layer 2 services such as Frame Relay and Asynchronous
Transfer Mode (ATM). The router-to-router link is a virtual circuit, which is subject not only to a
physical capacity, but also to a logical capacity limit. The installer or administrator needs to obtain
the physical link capacity and the QoS parameters. The important QoS parameters are CIR
(committed information rate) for Frame Relay, and MCR (maximum cell rate) for Asynchronous
Transfer Mode (ATM).
The difference between the current capacity and the acceptable limit is the available capacity. For
example, a T1 link used at 48% during the peak hour with a planning limit of 85% has an available
capacity of approximately 568 kbit/s.
Network engineering
Engineer the network for worst-case numbers to indicate the spare bandwidth a LAN must have to
handle peak traffic. It is important to plan so that the LAN/WAN can handle the IP telephony
traffic using the defined codec without delay or packet loss. The installer or administrator must
select one configuration and then set up the LAN/WAN so there is more bandwidth than the IP
telephony output.
Table 12 provides bandwidth characteristics for the transmission of voice over IP for various link
types given codec type and payload sizes. The bandwidths provided in this table explain the
continuous transmission of a unidirectional media stream.
Table 12 VoIP Transmission Characteristics for unidirectional continuous media stream
Codec Type Payload Size IP Packet Ethernet B/W
2
PPP B/W FR B/W
ms Bytes Bytes kbit/s kbit/s kbit/s
G.711
(64 kb/s)
10 80 120 116.8 97.6 103.2
20 160 200 90.4 80.8 83.6
30 240 280 81.6 75.2 77.1
G.729
(8 kb/s)
10 10 50 60.8 41.6 47.2
20 20 60 34.4 24.8 27.6
30 30 70 25.6 19.2 21.1
G.723.1
(6.3 kb/s)
30 24 64 24.0 17.6 19.5
G.723.1
(5.3 kb/s)
30 20 60 22.9 16.5 18.4
Notes:
1) Gray background indicates payload sizes used by Business Communications Manager 2.5 for transmission. Other values
listed indicate payload sizes that the Business Communications Manager 2.5 can receive.
2) Ethernet bandwidth includes the 14 byte Ethernet frame overhead plus a 12-byte inter-frame gap.
- 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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