Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 97
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4-3
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 4 Gateway Selection
DTMF Relay
Note The VG200 supports only Foreign Exchange Station (FXS) and
Foreign Exchange Office (FXO) interfaces in MGCP mode. A wider
interface selection is offered when the VG200 is configured in
H.323v2. While the Cisco AS5300 supports MGCP, it is currently
incompatible with Cisco CallManager. Although the Cisco 3810,
2600, and 3600 products have MGCP for analog interfaces in
Cisco IOS Release 12.1(3)T, they will not be supported by
Cisco CallManager until a future release, when the MGCP
administrative interface is expanded to incorporate larger numbers
of analog interfaces.
DTMF Relay
DTMF uses specific pairs of frequencies within the voice band for signaling. Over
a 64-kbps pulse code modulation (PCM) voice channel, these signals can be
carried without difficulty. However, when using a low-bit-rate codec for voice
compression, the potential exists for DTMF signal loss or distortion. Using an
out-of-band signaling method for carrying DTMF tones across a VoIP
infrastructure provides an elegant solution for these codec-induced symptoms.
Cisco 2600 No Yes Future
Cisco 3600 No Yes Future
Cisco 7200 No Yes No
Cisco 7500 No Future No
Cisco AS5300 No Yes No
Table 4-1 Cisco IP Telephony Gateways and Supported Protocols (continued)
Gateway
Skinny Gateway
Protocol H.323 MGCP
- 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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