Avaya IP Telephony Konfigurationsanleitung Seite 81
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Chapter 5 Configuring VoIP trunks 81
IP Telephony Configuration Guide
In a network configured for PSTN fallback, there are two connections between a Business
Communications Manager and a remote system.
One connection is a VoIP trunk connection through the IP network.
The fallback line is a PSTN line, which can be the public lines or a dedicated T1, BRI, PRI or
analog line (E&M), to the other system.
When a user dials the destination code, the system checks first to see if the connection between the
two systems can support an appropriate level of QoS. If it can, the call proceeds as normal over the
VoIP trunk. If the minimum acceptable level of QoS is not met, the call is routed over the second
route, through the PSTN line.
For PSTN fallback to work, you must ensure that the digits the user dials will be the same
regardless of whether the call is going over the VoIP trunk or the PSTN. In many cases, this
involves configuring the system to add and/or absorb digits. This process is explained during the
steps in “Configuring routes” on page 82 and “Creating destination codes for fallback” on page 84.
For detailed information about inserting and absorbing digits, see the Business Communications
Manager 3.0 Programming Operations Guide.
Setting up PSTN fallback includes:
• Enabling PSTN fallback
• Setting up the VoIP schedule
• Configuring routes and dialing digits
• Creating destination codes for fallback
• Activating the VoIP schedule
• Turning on QoS monitor
Enabling PSTN fallback
To enable PSTN fallback:
1 Open Services, IP Telephony and click on H.323 trunks.
2 Click the Fallback to Circuit-Switched menu and select Enabled-All or
Enabled-TDM-only. Enabled-TDM-only enables fallback for calls originating on digital
telephones. This is useful if your IP telephones are connected remotely, on the public side of
the Business Communications Manager network, because PSTN fallback is unlikely to result
in better quality of service in that scenario.
- Business Communications 1
- Manager 3.0 1
- IP Telephony Configuration 1
- Trademarks 2
- Table of Contents 3
- Chapter 4 5
- Chapter 5 5
- 12 Tables 12
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 14
- Preface 15 15
- Related publications 16
- How to get help 16
- APAC (Asia Pacific) 17
- Technical Support - CTAS 17
- 18 Preface 18
- Chapter 1 19
- Introduction 19
- IP telephones and VoIP trunks 20
- Figure 1 Network diagram 22
- Telephones 23
- Gatekeepers on the network 24
- IP network 24
- Key IP telephony concepts 25
- Jitter Buffer 26
- QoS routing 27
- Chapter 2 29
- Prerequisites checklist 29
- Network devices 30
- Network assessment 30
- Resource assessment 31
- Keycodes 33
- Defining published IP address 35
- NetVision wireless telephones 37
- IP telephones 37
- Chapter 3 39
- Installing IP telephones 39
- 2 Select the General tab 41
- Choosing a codec 42
- Choosing a Jitter Buffer 43
- Before installing 43
- Using a 3-port switch 43
- to move forward 46
- Other troubleshooting tips 48
- Configuring DHCP 49
- IP telephony DHCP notes 50
- Checking IP server status 52
- Figure 7 IP Terminal status 53
- Using the Hot Desking feature 57
- Notes about Hot Desking 58
- Customizing feature labels 59
- Moving IP telephones 63
- Figure 15 i2050 Switch type 65
- Configuring NetVision records 68
- <http:/ 69
- /symbol.com> 69
- Testing the handset functions 71
- Changing a handset Name 72
- Configuring VoIP trunks 73
- Configuring media parameters 74
- Field Value Description 75
- Outgoing call configuration 76
- Figure 18 Trunk/Line data 77
- Configuring a remote gateway 78
- Configuring PSTN fallback 80
- Enabling PSTN fallback 81
- Setting up the VoIP schedule 82
- Configuring routes 82
- Figure 23 Add route dialog 83
- Figure 24 VoIP schedule 85
- Activating the VoIP schedule 87
- Turning on QoS monitor 87
- PSTN fallback metrics 88
- Incoming call configuration 89
- Making calls 95
- Connecting an i200X telephone 96
- Quality of Service Monitor 100
- Port settings 101
- P0993474 03 102
- Figure 33 Port Ranges 102
- Using a gatekeeper 103
- Notes about NPI-TON aliases 107
- Gatekeeper call scenarios 113
- Chapter 6 115
- WarehouseHead Office 116
- Appendix A 121
- Efficient Networking 121
- Network engineering 122
- LAN engineering examples 126
- WAN engineering 126
- (8 kb/s) 127
- Setting Non-linear processing 128
- Enough link capacity 130
- Not enough link capacity 130
- Further network analysis 131
- Reduce link delay 132
- Reducing hop count 132
- Adjust the jitter buffer size 133
- Reduce packet errors 133
- Routing issues 134
- Appendix B 135
- Silence compression 135
- Time -> 137
- Bandwidth -> 137
- Channel/Link Max 137
- Comfort noise 140
- Appendix C 141
- Network performance utilities 141
- Appendix D 143
- Interoperability 143
- Speech path setup methods 144
- Media path redirection 144
- Gatekeeper 145
- No feedback busy station 146
- Interoperability 147 147
- Using VLAN on the network 148
- Interoperability 149 149
- Symbol NetVision telephones 150
- Interoperability 151 151
- 152 Interoperability 152
- Appendix E 153
- Quality of Service 153
- 154 Quality of Service 154
- Measuring Intranet QoS 155
- Recording routes 156
- Adjusting Ping measurements 157
- Measurement procedure 158
- Quality of Service 159 159
- Traffic mix 160
- TCP traffic behavior 160
- Network Quality of Service 161
- Network monitoring 162
- Quality of Service parameters 162
- Fallback to PSTN 163
- 164 Quality of Service 164
- Glossary 165
- 166 Glossary 166
- Glossary 167 167
- 168 Glossary 168
- Glossary 169 169
- 170 Glossary 170
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