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IP Telephony Configuration Guide
Gatekeeper call scenarios
This section explains what must be set up, and how a call would be processed for the two types of
gatekeeper configurations. The following figure shows a network with three Business
Communications Managers and a gatekeeper.
Figure 46 Business Communications Manager systems with a gatekeeper
This example explains how a call from DN 321 in Ottawa would be made to DN 421 in Santa
Clara. It assumes that call signaling is set to Gatekeeper Resolved and no pre-granted
AdmissionRequest (ARQ) has been issued:
1 Business Communications Manager Ottawa sends an ARQ to the gatekeeper for DN 421.
2 The gatekeeper resolves DN 421 to 10.10.10.19 and returns this IP in an AdmissionConfirm to
the Business Communications Manager Ottawa.
3 Business Communications Manager Ottawa sends the call Setup message for DN 421 to the
gateway at 10.10.10.19, and the call is established.
If call signaling is set to Gatekeeper Routed and no pre-granted ARQ has been issued:
1 Business Communications Manager Ottawa sends an ARQ to the gatekeeper for DN 421.
2 The gatekeeper resolves DN 421 to 10.10.10.17.
3 Business Communications Manager Ottawa sends the call Setup message for DN 421 to the
gatekeeper (10.10.10.17), which forwards it to the gateway at 10.10.10.19.
4 The call is established.
gatekeeper
IP:10.10.10.17
Business Communications Manager Ottawa
IP:10:10:10:18
Business Communications Manager Santa Clara
IP:10:10:10:19
Business Communications Manager Calgary
IP:10:10:10:20
DN 521
DN 421
DN 321
IP network
- Business Communications 1
- Manager 3.6 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 3 4
- Chapter 4 4
- Chapter 5 5
- 10 Contents 10
- P0609327 02 10
- Before you begin 15
- Symbols used in this guide 15
- Text conventions 16
- Acronyms 17
- Related publications 18
- How to get help 19
- 20 Preface 20
- Chapter 1 21
- Introduction 21
- IP telephones and VoIP trunks 22
- Figure 1 Network diagram 24
- Telephones 25
- Gatekeepers on the network 25
- IP network 26
- Key IP telephony concepts 27
- Jitter Buffer 28
- QoS routing 29
- Chapter 2 31
- Prerequisites checklist 31
- Network devices 32
- Network assessment 33
- Resource assessment 33
- Keycodes 34
- Option Description 35
- VoIP trunks 39
- IP telephone records 40
- Installing IP telephones 41
- Choosing a codec 45
- Choosing a Jitter Buffer 46
- Before installing 46
- Using a 3-port switch 46
- Display buttons 48
- Troubleshooting IP telephones 51
- Operation issues 52
- Configuring DHCP 53
- IP telephony DHCP notes 54
- Checking IP server status 56
- Figure 7 IP Terminal status 57
- Notes about Hot Desking 62
- Customizing feature labels 63
- Moving IP telephones 69
- Figure 16 i2050 Switch type 72
- Handset and call functions 74
- Configuring NetVision records 75
- Assigning general settings 76
- Changing a handset Name 82
- Deregistering a telephone 83
- Configuring local VoIP trunks 85
- Published IP address 86
- Counting IP trunks 87
- Configuring media parameters 89
- Setting up the local gateway 91
- How to use target lines 98
- Configuring target lines 99
- Chapter 6 101
- Field Value Description 104
- 6 Click the Save button 105
- Outgoing call configuration 107
- H.323 trunks 108
- SIP trunks 108
- Keycodes: 2 108
- PSTN call to remote node 109
- Call process 110
- Describing a fallback network 113
- Adding routes for fallback 114
- Figure 35 Route XXX screen 115
- Figure 36 VoIP schedule 117
- How fallback routing works 120
- Settings for 124
- Santa Clara 124
- Connecting an i200X telephone 125
- PSTN fallback metrics 126
- Quality of Service Monitor 127
- Updating the QoS monitor data 128
- Chapter 7 129
- 3 Enter the port settings 130
- Modifying PortRanges 131
- Using a gatekeeper 133
- 8 Click Submit 140
- Gatekeeper call scenarios 141
- Faxing over VoIP lines 142
- Chapter 8 147
- WarehouseHead Office 148
- Appendix A 153
- Efficient Networking 153
- Network engineering 154
- LAN engineering examples 157
- WAN engineering 158
- Setting Non-linear processing 159
- Enough link capacity 161
- Further network analysis 162
- Components of delay 163
- Reduce link delay 163
- Reducing hop count 164
- Adjust the jitter buffer size 164
- Reduce packet errors 164
- Routing issues 165
- Appendix B 167
- Silence compression 167
- Time -> 169
- Bandwidth -> 169
- Channel/Link Max 169
- Comfort noise 172
- Appendix C 173
- Network performance utilities 173
- Appendix D 175
- Interoperability 175
- Speech path setup methods 176
- Media path redirection 177
- Gatekeeper 177
- No feedback busy station 178
- Interoperability 179 179
- 180 Interoperability 180
- Using VLAN on the network 181
- 182 Interoperability 182
- Symbol NetVision telephones 183
- 184 Interoperability 184
- Interoperability 185 185
- 186 Interoperability 186
- Interoperability 187 187
- 188 Interoperability 188
- Interoperability 189 189
- 190 Interoperability 190
- Appendix E 191
- Quality of Service 191
- 192 Quality of Service 192
- Measuring Intranet QoS 193
- Recording routes 194
- Adjusting Ping measurements 195
- Measurement procedure 196
- Quality of Service 197 197
- Traffic mix 198
- TCP traffic behavior 199
- Network Quality of Service 200
- Quality of Service parameters 201
- Fallback to PSTN 201
- 202 Quality of Service 202
- Glossary 203
- 204 Glossary 204
- Glossary 205 205
- 206 Glossary 206
- Glossary 207 207
- 208 Glossary 208
- Glossary 209 209
- 210 Glossary 210
- 222 Index 222
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