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Chapter 5 Configuring VoIP trunks 89
IP Telephony Configuration Guide
The call signaling method
The call signaling method defines how the Business Communications Manager prefers call
signaling information to be directed. Call signaling establishes and disconnects a call. The
Business Communications Manager can use three types of call signaling:
• Direct: Under the direct call signaling method, call signaling information is passed directly
between endpoints. The remote gateway table in the Unified Manager contains a mapping of
phone numbers which the Business Communications Manager uses to perform DN-to-IP
address resolution.
• Gatekeeper Resolved: Gatekeeper Resolved signaling uses a gatekeeper for call permission
and address resolution. All call signaling occurs directly between H.323 endpoints. In effect,
the gateway requests that the gatekeeper resolve the phone numbers into IP addresses, but the
gatekeeper is not involved in call signaling.
• Gatekeeper Routed: Gatekeeper Routed signaling uses a gatekeeper for call permission and
address resolution. In this method, call signaling is directed through the gatekeeper.
For information about changing the call signaling method, see “Modifying the call signaling
method” on page 90.
Alias names
One or more alias names may be configured for a Business Communications Manager. Alias
names are comma delimited, and may be one of the following types:
• E.164 — numeric identifier containing a digit in the range 0-9 (commonly used since it fits
into dialing plans). Identified by the keyword
TEL:
• H323Identifier
—
alphanumeric strings representing names, e-mail addresses, etc. Identified
by the keyword
NAME:
• Transport Address — IP Address. Identified by the keyword
TA:
In the following example the Business Communications Manager is assigned an E.164 and an
H323 Identifier alias:
Alias Names: tel:76, name:bcm10.nortel.com
Note: The Business Communications Manager can request a method for call signaling,
but whether this request is granted depends on the configuration of the gatekeeper.
Ultimately, the gatekeeper decides which call signaling method to use.
- 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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