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Chapter 4 Gateway Selection
Supported Protocols
4-2
Cisco IP Telephony Network Design Guide
78-11103-03
Supported Protocols
Using Cisco CallManager Release 3.0(5), three types of gateway protocols are
supported:
• Skinny Gateway Protocol—used by the digital gateways, including the
Cisco Access Digital Trunk Gateway DT-24+ and DE-30+, as well as the
Cisco Catalyst 6000 Voice Gateway module.
• Media Gateway Control Protocol (MGCP)—used by Cisco CallManager to
control the new Cisco Voice Gateway 200 (VG200) standalone analog
gateway.
• H.323—used by the Cisco IOS integrated router gateways to communicate
with Cisco CallManager.
Of these three types, only the Cisco IOS H.323 gateways can today provide
full-featured routing capabilities as well as VoIP gateway functions. Both the
gateways based on the Skinny Gateway Protocol and the VG200 MGCP gateway
act as standalone, application-specific gateways.
Table 4-1 shows which protocols are supported on each gateway. The following
sections discuss how each of these protocols provides support for the three core
gateway features.
Table 4-1 Cisco IP Telephony Gateways and Supported Protocols
Gateway
Skinny Gateway
Protocol H.323 MGCP
VG200 No Yes Yes
DT-24+ and DE-30+ Yes No No
Catalyst 4000
WS-X4604-GWY
gateway module
Yes, for conferencing
and MTP transcoding
services
Yes, for PSTN
interfaces
Future
Catalyst 6000
WS-X6608-T1 and
WS-X6608-E1 gateway
modules
Yes No Future
Cisco 1750 No Yes No
Cisco 3810 V3 No Yes Future
- 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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