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Chapter 3 Cisco CallManager Clusters
Intercluster Communication
3-16
Cisco IP Telephony Network Design Guide
78-11103-03
The use of gatekeepers provides both inbound and outbound call admission
control. With Cisco CallManager Release 3.0(5), a maximum of 100
Cisco CallManagers can register with a gatekeeper. This method of call admission
control is restricted to a single active gatekeeper per network. Redundancy can be
achieved using the Hot Standby Routing Protocol (HSRP) between two
gatekeepers.
Gatekeeper call admission control is a policy-based scheme. It requires static
configuration of available resources and is not aware of network topology. It is,
therefore, necessary to restrict gatekeeper call admission control schemes to
hub-and-spoke topologies with the redundant gatekeeper or gatekeepers (using
HSRP) located at the hub. The WAN must be provisioned accordingly, and the
voice priority queue must be dimensioned to support all admitted calls.
Figure 3-8 illustrates this deployment model.
Table 3-4 Recommended Bandwidth Configuration for Intercluster Calls Using G.729
Number of
Intercluster
Calls
Bandwidth Required
per Call
Bandwidth Required on
WAN Links (LLQ/CBWFQ
1
)
1. Low latency queuing/class based weighted fair queuing
Bandwidth Configured on
Gatekeeper
Without
cRTP
2
2. Compressed Real-time Transport Protocol
With cRTP
Without
cRTP With cRTP Without cRTP With cRTP
2 24 kbps 12 kbps 48 kbps 24 kbps 40 kbps 40 kbps
5 24 kbps 12 kbps 120 kbps 60 kbps 100 kbps 100 kbps
10 24 kbps 12 kbps 240 kbps 120 kbps 200 kbps 200 kbps
Table 3-5 Recommended Bandwidth Configuration for Intercluster Calls Using G.711
Number of
Intercluster
Calls
Bandwidth Required
per Call
Bandwidth Required on
WAN Links (LLQ/CBWFQ)
Bandwidth Configured on
Gatekeeper
2 80 kbps 160 kbps 256 kbps
5 80 kbps 400 kbps 640 kbps
10 80 kbps 800 kbps 1280 kbps
- Cisco IP Telephony 1
- Network Design Guide 1
- CONTENTS 3
- Contents 4
- 4 Gateway Selection 4-1 6
- 8 Quality of Service 8-1 8
- 11 Network Management 11-1 10
- Audience 12
- Organization 12
- Revision History 14
- Conventions 15
- Additional Information 17
- Obtaining Documentation 18
- Documentation Feedback 19
- Cisco.com 19
- Technical Assistance Center 20
- Contacting TAC by Telephone 21
- Introduction 23
- Chapter 1 Introduction 24
- General Design Models 24
- Single-Site Model 25
- Overview 36
- Power Protection Strategies 38
- Network Infrastructure 39
- High Availability 41
- Further Information 42
- Physical Connectivity Options 43
- Power to IP Phones 44
- Daughtercard 45
- Inline Power Configuration 47
- Power Consumption 49
- Error and Status Messages 50
- Dual Supervisors 50
- Power Protection 50
- External Patch Panel Power 51
- Summary of Recommendations 54
- Wall Power 54
- IP Addressing and Management 55
- CDP Enhancements 56
- Power Requirement Field 57
- Voice VLAN Configuration 58
- Connecting to the Network 59
- Trust Boundaries 63
- Untagged 802.3 64
- Tagged 802.1q 64
- QoS Commands 67
- Cisco CallManager Clusters 73
- Device Weights 75
- Intracluster Communication 77
- Cisco CallManager Redundancy 78
- Device Pool Configuration 81
- Campus Clustering Guidelines 84
- Intercluster Communication 86
- Gateway Selection 95
- Supported Protocols 96
- DTMF Relay 97
- Skinny Gateways 98
- Cisco IOS H.323 Gateways 98
- MGCP Gateway 100
- Supplementary Services 101
- IOS H.323 Gateways 102
- Chapter 4 Gateway Selection 104
- 78-11103-03 104
- Protocol 107
- Skinny Gateway 107
- Dial Plan Architecture and 109
- Configuration 109
- Route Pattern 114
- Route List 115
- Route Group 115
- Digit Translation Tables 117
- On-Net Route Pattern 119
- Restrictions 122
- Partitions 123
- Calling Search Space 123
- The Role of a Gatekeeper 129
- Processing 131
- Call Admission Control 133
- Operational Model 138
- Gatekeeper Configuration 139
- Dial Plan Considerations 145
- Conferencing 160
- Intercluster Calls 168
- Local PSTN Calls 168
- Design Example 168
- Quality of Service 175
- Traffic Classification 176
- Interface Queuing 176
- Chapter 8 Quality of Service 177
- Campus QoS Model 177
- WAN QoS Model 178
- WAN QoS Tools 179
- Link Efficiency Techniques 181
- Traffic Shaping 183
- Best Practices 184
- Catalyst DSP Provisioning 187
- Conferencing Design Details 190
- Conferencing Caveats 192
- Voice mail 194
- CallManager 194
- MTP Transcoding Caveats 198
- Catalyst 4000 Voice Services 199
- Catalyst 6000 Voice Services 201
- Network Models 203
- IP network 206
- Why is the DPA 7630 Needed? 223
- Can I Just Use SMDI? 223
- Choosing an Integration Mode 224
- Figure 10-12) 227
- Network Management 229
- Chapter 11 Network Management 230
- System Logging Components 231
- Syslog Collector 232
- SAenvProperties.ini 233
- Database 233
- CiscoWorks2000 236
- Campus Manager 239
- User Tracking 240
- Trace Path Analysis 241
- Resource Manager Essentials 243
- System Logging Management 244
- Syslog Message Filtering 246
- Glossary 250
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