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Chapter 5 Configuring VoIP trunks 69
IP Telephony Configuration Guide
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 70 and “Creating destination codes for fallback” on page 72.
For detailed information about inserting and absorbing digits, see the Business Communications
Manager 2.5 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.
Setting up the VoIP schedule
You can determine which telephones/lines will choose the VoIP route as the prime route by setting
up the VoIP schedule to allow you to manually activate the service from a control set. The PSTN
route gets assigned to the Normal schedule, which runs on all telephones when no other schedule
is activated.
Follow these steps to set up the VoIP schedule:
1 Open Services, Telephony Services, Scheduled Services, Routing Service, and click on
VoIP. The VoIP schedule screen appears in the right frame. Refer to Figure 23.
Figure 23 VoIP Routing Service
- 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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