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Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 4 Gateway Selection
Site-Specific Gateway Requirements
4. Cisco CallManager issues a request to IP phone 2, using the Skinny Station
Protocol, to set up an RTP connection to the Cisco IOS gateway. At the same
time, Cisco CallManager issues an OpenLogicalChannel request to the
Cisco IOS gateway with the new destination parameters, but using the same
SessionID.
5. After the Cisco IOS gateway acknowledges the request, an RTP voice bearer
channel is set between IP phone 2 and the Cisco IOS gateway.
MGCP Gateway
The VG200 provides full support for the hold, transfer, and conference features
using MGCP. Because MGCP is fundamentally a master-slave protocol, with
Cisco CallManager controlling all session intelligence, it can easily manipulate
VG200 voice connections. If a Cisco AVVID endpoint needs to modify the
session (for example, transfer the call to another Cisco AVVID endpoint), the
endpoint would notify Cisco CallManager through the Skinny Station Protocol.
Cisco CallManager would then inform the VG200, using the MGCP UDP control
connection, to terminate the current RTP stream associated with the SessionID
and start a new media session with the new endpoint information.
Site-Specific Gateway Requirements
Besides the requirements for DMTF relay and supplementary services, each
Cisco IP telephony implementation has its own gateway requirements. The
following is a sample list of questions regarding required features that should be
asked prior to selecting a Cisco IP telephony gateway.
• Is an analog or digital gateway required?
• What is the required capacity of the gateway?
• What type of connection is the gateway going to use (for example, FXO
ground-start, E1-R2, network-side or user-side PRI)?
• What types of supplementary services are desired?
• Is voice compression a part of the design? If so, which types?
- 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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