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88 Chapter 5 Configuring VoIP trunks
P0937663 03.1
4 Change the port settings.
5 Click the Save button.
Port settings for legacy networks
Business Communications Manager 2.5 uses UDP port ranges to provide high priority to VoIP
packets in existing legacy IP networks. You must reserve these same port ranges and set them to
high priority on all routers that an administrator expects to have QoS support. You do not need to
reserve port ranges on DiffServ networks.
You can select any port ranges that are not used by well-known protocols or applications.
Each H.323 or VoIP Realtime Transfer Protocol (RTP) flow uses two ports for each direction. The
total number of UDP port numbers to be reserved depends on how many concurrent RTP flows are
expected to cross a router interface. In general:
• Backbone routers reserve more ports than edge routers.
• The port ranges on edge routers are a subset of the backbone router port ranges.
• Include port number UDP 5000 in the reserved port ranges, for the QoS monitor.
• The port ranges reserved in a Business Communications Manager 2.5 system are also reserved
by the remote router.
• You must reserve two ports for each voice call you expect to carry over the WAN link.
• You can reserve multiple discontinuous ranges. Business Communications Manager 2.5
requires that each range meet the following conditions:
— Each range must start with an even number.
— Each range must end with an odd number.
— You cannot have a total of more than 256 ports reserved.
Using a gatekeeper
The Business Communications Manager supports the use of an ITU-H323 gatekeeper. A
gatekeeper is a third-party software application residing somewhere on the network, which
provides services such as:
• address translation
• admission control (ARQ)
• bandwidth control
• zone management
H.323 endpoints such as the Business Communications Manager are configured with one or more
alias names that are registered with the gatekeeper. The gatekeeper stores the alias-IP mapping
internally and uses them to provide aliases to IP address translation services. Later, if an endpoint
IP address changes, that endpoint must re-register with the gatekeeper.
Refer to the gatekeeper software documentation for information about changing IP addresses.
- 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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