- Overview of Dial Interfaces, Controllers, and Lines
- Configuring Asynchronous Lines and Interfaces
- Asynchronous Call Queueing by Role
- Configuring Asynchronous Serial Traffic Over UDP
- Configuring and Managing Integrated Modems
- 1- and 2-Port V.90 Modem WICs for Cisco 2600 and Cisco 3600 Series Multiservice Platforms
- Call Tracker show Commands Extensions
- Cisco NM-8AM-V2 and NM-16AM-V2 Analog Modem Network Modules with V.92
- MICA and NextPort Modem Tech-Support Command Additions
- PIAFS Wireless Data Protocol Version 2.1 for Cisco MICA Modems
- V.92 and V.44 Support for Digital Modems
- V.92 Modem on Hold for Cisco AS5300 and Cisco AS5800 Universal Access Servers
- V.92 Modem on Hold for Cisco AS5350, Cisco AS5400, and Cisco AS5850 Universal Gateways and Cisco AS5800 Universal Access Servers
- V.92 Quick Connect for Cisco AS5300 and Cisco AS5800 Universal Access Servers
- V.92 Quick Connect for Cisco AS5350, Cisco AS5400, and Cisco AS5850 Universal Gateways and Cisco AS5800 Universal Access Servers
- V.92 Reporting Using RADIUS Attribute v.92-info
- Configuring and Managing Cisco Access Servers and Dial Shelves
- Configuring and Managing External Modems
- Modem Signal and Line States
- Creating and Using Modem Chat Scripts
- Cisco Modem User Interface
- Modem Script and System Script Support in Large-Scale Dial-Out
- Leased and Switched BRI Interface for ETSI NET3
- ISDN BCAC and Round-Robin Channel Selection Enhancements
- Configuring Virtual Asynchronous Traffic over ISDN
- Configuring Modem Use over ISDN BRI
- Configuring X.25 on ISDN
- Configuring X.25 on ISDN Using AO/DI
- Configuring ISDN on Cisco 800 Series Routers
- Cisco IOS Software Feature Removal
- Configuring ISDN PRI
- Dialing Number Enhancement
- ISDN BCAC and Round-Robin Channel Selection Enhancements
- Configuring ISDN Special Signaling
- Configuring Network Side ISDN PRI Signaling, Trunking, and Switching
- Preparing to Configure DDR
- Configuring Legacy DDR Spokes
- Configuring Legacy DDR Hubs
- Configuring Peer-to-Peer DDR with Dialer Profiles
- Dialer Map VRF-Aware for an MPLS VPN
- Dialer Persistent
- PPPoE Client DDR Idle-Timer
- Redial Enhancements
- Rotating Through Dial Strings
- Configuring Dialer CEF
- CEF Support for Dialer Profiles on Cisco 7500 Routers
- Configuring Snapshot Routing
- Reliable Static Routing Backup Using Object Tracking
- Configuring Dial Backup for Serial Lines
- Configuring Dial Backup Using Dialer Watch
- Dialer Watch Connect Delay
- VRF Aware Dialer Watch
- Configuring Dial Backup with Dialer Profiles
- ISDN Backup in MPLS Core
- Configuring Cisco Easy IP ..
- Configuring Virtual Template Interfaces
- Multiclass Multilink PPP
- Configuring Asynchronous Callback
- Configuring PPP Callback
- Configuring ISDN Caller ID Callback
- Configuring BACP
- Configuring an IP Local Pools Holdback Timer
- Configuring per-User Configuration
- Configuring Resource Pool Management
- Configuring Wholesale Dial Performance Optimization
- Large-Scale Dial-Out
- Dial-Out DS0 Level Trunk Group
- L2TP Large-Scale Dial-Out
- L2TP Large-Scale Dial-Out per-User Attribute via AAA
- Modem Script and System Script Support in Large-Scale Dial-Out
- Large-Scale Dial-Out (LSDO) VRF Aware
- Peer Pool Backup
- Dial Networking Business Applications
- Enterprise Dial Scenarios and Configurations
- Telco and ISP Typical Dial Scenarios and Configurations
- Modem Initialization Strings
Configuring Modem Use over ISDN BRI
This chapter describes how to configure the Modem over ISDN BRI feature. It includes the following main sections:
- Modem over ISDN BRI Overview
- How to Configure Modem over ISDN BRI
- Verifying ISDN BRI Interface Configuration
- Configuration Examples for Modem over ISDN BRI
Before beginning the tasks in this chapter, check your system for the following hardware and software:
- At least one of the following digital modem network modules. The number in the model name indicates the number of digital modems that can be connected to the module.
These digital modem network modules do not have their own network connections, but instead handle analog calls passing through other router interfaces. BRI modules can provide their ISDN connectivity. Other modules, such as Ethernet, can provide connectivity to the LAN. The digital modem module acts as a pool of available modems that can be used for both incoming and outgoing calls. Digital modem network modules do not support BRI voice interface cards or wide-area network (WAN) interface cards.
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NM-4B-S/T: 4-port ISDN BRI network module, minimum version 800-01236-03
– NM-4B-U: 4-port ISDN BRI with integrated network termination 1 (NT-1) network module, minimum version 800-01238-06
– NM-8B-S/T: 8-port ISDN BRI network module, minimum version 800-01237-03
– NM-8B-U: 8-port ISDN BRI with integrated NT-1 network module, minimum version 800-01239-06
The version level is available from the show diag command, which displays the version number as the part number.
If your BRI network module is a version lower than those cited or you need more details, refer to the Cisco.com Field Notice titled Using Digital Modems with the Cisco 3600 Basic Rate Interface (BRI) Network Module Upgrade in the Access Products index. If your existing Cisco BRI network module is one of those listed and does not support the Modem over ISDN BRI feature, Cisco will upgrade the module at no charge.
- To support the Modem over ISDN BRI feature, V.90 modem portware—for instructions on downloading this software or obtaining it otherwise, refer to the Cisco 3600 Series Modem Portware Upgrade Configuration Note on Cisco.com.
Before you can configure a Cisco 3640 router to provide Modem over ISDN BRI connectivity, you must also perform the following tasks:
- Obtain BRI service from your telecommunications provider. The BRI line must be provisioned at the switch to support voice calls.
- Install a 4-port or 8-port BRI network module into your Cisco router. Depending on the type of network module and your BRI service, you might also need to install an external NT-1 for S/T interfaces.
- Install a supported digital modem network module into the Cisco 3640 router.
- After the system comes up, make sure enough buffers are in the free list of the buffer pool that matches the maximum transmission unit (MTU) of your BRI interface. If not, you must reconfigure buffers so the BRI interfaces function properly. To check the MTU of your interfaces, use the show interfaces bri command. The show buffers command displays the free buffer space. Use the buffers global configuration command to make adjustments to initial buffer pool settings and to the limits at which temporary buffers are created and destroyed.
For more information about the physical characteristics of the BRI network modules and their digital modem support, or instructions on how to install the network or modem modules, either refer to the Cisco 3600 series Network Module Hardware Installation Guide that came with your BRI network module or view the up-to-date information on CCO.
To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the “Identifying Supported Platforms” section in the “Using Cisco IOS Software” chapter.
For a complete description of the Modem over ISDN BRI commands in this chapter, refer to the Cisco IOS Dial Technologies Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.
Modem over ISDN BRI Overview
The Modem over ISDN BRI feature for the Cisco 3640 modular access router lowers the cost of remote access by offering high-speed modem and ISDN connectivity for mobile customers, offices, and other remote-access users. Branch offices and enterprises can support analog modem users who call over the Public Switched Telephone Network (PSTN) into BRI interfaces in Cisco 3640 routers.
The digital modem in the router accepts the modem calls at connection speeds as fast as 56 kbps, adhering to the V.90 standard. As shown in Figure 1, the Cisco 3640 router in this way provides rapid access to E-mail and other network services.
Figure 1 Modem over ISDN BRI Feature
The following are benefits of using the Modem over ISDN BRI feature:
How to Configure Modem over ISDN BRI
The Modem over ISDN BRI feature is part of interface configuration for BRI. You configure the BRI interface after you have configured the ISDN global characteristics, which are switch type and TEI negotiation timing. These characteristics can also be defined for each BRI interface, as shown in the following task table.
To set up the BRI interface characteristics, set the global parameters and then configure each interface separately by using the following commands beginning in global configuration mode:
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Configures the global ISDN switch type to match the service provider switch type. For a list of keywords, see Table 1 . |
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Configures when the ISDN TEI negotiation occurs. If this command is not used, negotiation occurs when the router is powered up. The first-call option is primarily used in European ISDN switch types, such as NET3 networks. The powerup option should be used in most other locations. |
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Begins interface configuration mode to configure parameters for the specified interface. slot is the location of the BRI module. Valid values are from 0 to 3. port is an interface number. Valid values are from 0 to 7 if the module is an 8-port BRI network module, or from 0 to 4 if the module is a 4-port BRI network module. |
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Specifies an IP address and subnet for the interface. You can also specify that there is no IP address. For information about IP addressing, see the Release 12.2 Cisco IOS IP Configuration Guide publication. |
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Enables PPP encapsulation on the BRI interface. PPP encapsulation is configured for most ISDN communication. If the router needs to communicate with devices that require a different encapsulation protocol, needs to detect encapsulation on incoming calls automatically, or needs to send traffic over a Frame Relay or X.25 network, see the chapter “Configuring X.25 on ISDN” later in this part, and the chapters in the Dial-on-Demand Routing Configuration part of this publication for information. |
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Router(config-if)# dialer map protocol next-hop-address name hostname speed 56 Router(config-if)# dialer map protocol next-hop-address name hostname spc |
(Most locations) Defines the remote protocol address of the recipient, host name, and dialing string; optionally, provide the ISDN subaddress; set the dialer speed to 56 or 64 kbps, as needed. (Germany) Use the spc keyword to enable ISDN semipermanent connections. |
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Assigns the interface to a dialer group to control access to the interface. |
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Router(config-if)# dialer-list dialer-group list access-list-number |
Associates the dialer group number with an access list number. |
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Router(config-if)# access-list access-list-number { deny | permit } protocol source address source-mask destination destination-mask |
Defines an access list permitting or denying access to specified protocols, sources, or destinations. Permitted packets cause the router to place a call to the destination protocol address. |
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(Optional) Disables the translation of directed broadcast to physical broadcasts. |
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(Optional) Configures the interface ISDN switch type to match the service provider switch type. The interface ISDN switch type overrides the global ISDN switch type on the interface. For a list of keywords, refer to Table 1 . |
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(Optional) Determines when ISDN TEI negotiation occurs for an individual interface. This overrides the global configuration command. |
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Specifies a service profile identifier (SPID) and local directory number for the B1 channel. Currently, only the DMS-100 and NI-1 switch types require SPIDs. Although the Lucent 5ESS switch type might support a SPID, we recommend that you set up that ISDN service without SPIDs. |
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Specifies a SPID and local directory number for the B2 channel. |
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Router(config-if)# isdn answer1 [ called-party-number ][ : subaddress ] |
(Optional) Configures called-party number verification for a called-party number or subaddress number in the incoming setup message. |
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(Optional) Configures the speed for incoming calls recognized as not ISDN end-to-end. |
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Routes incoming voice calls to the modem and treats them as analog data. This step is required for the Modem over ISDN BRI feature. |
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Router(config-if)# isdn disconnect-cause { cause - code - number | busy | not available} |
Overrides specific cause codes such as modem availability and resource pooling that are sent to the switch by ISDN applications. When the isdn disconnect-cause command is implemented, the configured cause codes are sent to the switch; otherwise, the default cause codes of the application are sent. The cause-code-number argument sends a cause code number (submitted as integer 1 through 127) to the switch. The busy keyword sends the USER BUSY code to the switch. The not available keyword sends the CHANNEL NOT AVAILABLE code to the switch. |
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(Optional) Configures the BRI interface to include the Sending Complete information element in the outgoing call Setup message. Used in some geographic locations, such as Hong Kong and Taiwan, where the sending complete information element is required in the outgoing call setup message. |
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See the section “Configuration Examples for Modem over ISDN BRI” at the end of this chapter for configuration examples.
Verifying ISDN BRI Interface Configuration
Use the show running-config command in EXEC mode to verify the current configuration that is running on the terminal.
Note The show startup-config shows the configuration stored in NVRAM or in a location specified by the CONFIG_FILE environment variable.
The following example shows some of the command output that is relevant to BRI configuration tasks. The bold text in the example are the results of configuration steps such as those shown in the section “How to Configure Modem over ISDN BRI” earlier in this chapter.
ip address 10.1.1.26 255.255.255.1
no ip directed-broadcast
encapsulation ppp
no ip route-cache
no ip mroute-cache
no keepalive
shutdown
dialer idle-timeout 180
dialer map ip 10.1.1.9 name MDial1 14085550715
dialer map ip 10.1.1.14 name MDial2 14085553775
dialer-group 1
isdn switch-type basic-5ess
isdn incoming-voice modem
isdn disconnect-cause busy
no fair-queue
no cdp enable
Use the show interfaces bri number command to verify information about the physical attributes of the ISDN BRI B and D channels. The number argument is the slot location of the BRI module. Valid values are from 0 to 3.
Internet address is 10.1.1.3/27
Encapsulation PPP, loopback not set, keepalive not set
LCP Closed
Configuration Examples for Modem over ISDN BRI
This section provides the following examples:
These examples show configuration of just the Modem over ISDN BRI feature using the interface configuration commands for each interface and a complete configuration showing global configuration, BRI interfaces, and modem configuration.
BRI Interface Configuration Example
The following example shows how to configure each BRI interface on a Cisco 3640 router for the Modem over ISDN BRI feature:
Complete Configuration Examples
The following example shows a complete configuration for a dial-in router, including a global command, BRI interface configuration, and modem configuration including group-async and dialer commands.
The following lines are used for PPP CHAP authentication. Each username and password is associated with one dialer interface.
The following example defines a group-async interface for grouping all the digital modems and configuring them together. Group-async configuration is much easier than configuring all 30 digital modems individually.
The following example defines dialer interfaces, associates IP addresses, and sets all the authentication parameters required during the call establishment.
The following lines define routes that send incoming packets out via specific interfaces:
The following example configures the lines associated with the digital modems:
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