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Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note
OL-3008-01
Chapter 8 Configuring the DSP Farm
About the DSP Farm
• Up to 24 channels or voice streams
Partitioning the 24 channels into a set of conferences is done at the Cisco CallManager.
• A maximum of six participants per conference
• A maximum of eight simultaneous conferences
• G.711 a-Law or u-Law encoding only
Transcoding Service
The transcoding service allows an external Cisco CallManager to use the DSP farm to compress or
decompress WAN packets of voice streams between G.723.1 or G.729a to or from G.711. G.711 is the
uncompressed format for LANs.
Transcoding is required when a remote device compresses its voice stream to save WAN bandwidth and
the local device does not support the coding scheme.The transcoding service compresses and
decompresses voice streams to match the end-point device capabilities. A transcoding node can convert
a G.711 voice stream into a low bit-rate (LBR) compressed voice stream such as G.729a. to enable
applications such as integrated voice response (IVR), uOne messaging, and conference calls over IP
WANs.
Figure 8-4 shows the IP telephony transcoding service, where party A calls party B and party B diverts
the call to voice mail.
Figure 8-4 IP Telephony Transcoding Service—Party A Calls B
In this example, the initial call is reserved and compressed by the end stations. When the call is diverted
to voicemail, DSP resources are needed to decompress the call. The compressed WAN call leg and
reservation are moved to the DSP farm and held intact.
When a user on an IP Phone at a remote location calls a user located at a central location, the Cisco
CallManager instructs the remote IP Phone to use compressed voice, or G.729a, for the WAN call. If the
called user at the central site is unavailable, the call rolls to the uOne messaging system, which only
supports G.711. In this case, a packet-to-packet gateway transcodes the G.729a voice stream to G.711
to leave a message with the uOne messaging server.
The transcoding service supports:
• Up to 16 full-duplex channels on 8 DSPs
• G.711 a-Law or u-Law to or from either G.729a or G.723.1
• Capability to revert to one of several backup Cisco CallManagers in case the main one fails
IP
IP
IP
IP
IP WAN
Voice
mail
Voice
mail
CallManager CallManager
Access Gateway Access Gateway
B A
44358
V V
DSPDSP
- Cisco Catalyst 4000 1
- Access Gateway Module 1
- CONTENTS 3
- Contents 4
- Audience 9
- Organization 9
- Conventions 10
- Safety Overview 11
- Related Documentation 12
- Obtaining Documentation 13
- Documentation Feedback 14
- Cisco.com 14
- Technical Assistance Center 15
- Overview 17
- IP Telephony Campus 18
- Large Branch Office 18
- • the console port on the AGM 19
- Hardware Features 20
- Cisco Catalyst 4000 DSP Set 21
- Data Interface Modules 21
- Voice Interface Modules 22
- Signaling Support on AGM 23
- Switch-Type Support on AGM 23
- Software Features 24
- Security 25
- Resiliency 25
- Network Management Support 26
- Preparing to Install the AGM 27
- Installing the AGM 29
- Hot-Swapping Features 31
- Checking the AGM Operation 32
- Power Supply 1 34
- Power Supply 2 34
- WAN Interface Modules 35
- SEE MANUAL 36
- INSTALLATION 36
- Straight-through 41
- RJ-11-to-RJ-11 cable 41
- RJ-11 ports 41
- RJ-11 wall jack 41
- RJ-21 Connectors 42
- Velcro strap 43
- ConfigurableNot used 45
- RJ-48S ports 47
- RJ-48S wall jack 47
- RJ-48C ports 48
- NT1 device 48
- RJ-45-to-RJ-45 cable 48
- S/T port 48
- RJ-48C-to-RJ-48C cable 50
- RJ-48C wall jack 50
- Booting the AGM 53
- Accessing the AGM 54
- Configuring the Console Port 55
- Connecting a Terminal 56
- Connecting a Modem 56
- Using the Cisco IOS CLI 57
- Getting Help 58
- Command Modes 58
- Gateway(config-if)# 59
- (config 59
- Gateway(config-dial-peer)# 59
- Saving Configuration Changes 60
- Table 4-2 ISDN Switch Types 68
- Configuring T1 Interfaces 69
- Configuring E1 Interfaces 71
- Preparing to Configure VoIP 75
- Configuring Voice Interfaces 76
- MGCP Configuration 77
- Enabling MGCP 78
- • E&M Wink Start 81
- • E&M Delay Start 81
- H.323 Gateway Configuration 86
- FXS Emulation Example 90
- FXO Emulation Example 90
- E&M Emulation Example 91
- Configuring ISDN BRI Lines 92
- Gateway 1 Configuration 95
- T1/E1 Configuration (H.323) 96
- T1/PRI Configuration Example 97
- E1/PRI Configuration Example 98
- Configuration for AGM AGLB-1 99
- Configuration for AGM AGLB-2 100
- FXO Connection to PSTN 101
- San Jose Salt Lake City 102
- AGM SLC Configuration 103
- OL-3008-01 104
- Configuring FXS Voice Ports 106
- Validating the Configuration 107
- Fine-Tuning FXS Voice Ports 108
- Activating the Voice Port 110
- Sample Configuration 110
- Verifying the Configuration 120
- Sample Configurations 121
- Configuration File for Peer 1 124
- Configuration File for Peer 2 126
- Configuring the DSP Farm 129
- IP Telephony Gateway Mode 130
- Conferencing Service 131
- Transcoding Service 132
- Troubleshooting the AGM 137
- Troubleshooting Controller 138
- Troubleshooting Hardware 141
- Troubleshooting TDM 141
- Troubleshooting DSP 142
- SIMM 3 DSP 12–17 143
- SIMM 4 DSP 18–23 143
- Entering ROM Monitor Mode 145
- Configuring for Autoboot 146
- ROM Monitor Commands 147
- Debugging Commands 150
- Cookie Commands 151
- Upgrading the ROM Monitor 157
- Using Loss Plan Defaults 159
- Transmission Loss Plan 160
- Console Connector Pinouts 161
- Management Port Pinouts 161
- Identifying a Rollover Cable 163
- Connecting to a PC 164
- Connecting to a Terminal 164
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