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Table Of Contents
Supported Standards, MIBs, and RFCs
Configuring the Order of Dial Strings
Monitoring and Maintaining the Rotating Through Dial Strings Feature
Legacy Dialer with Multiple Dial Strings Example
Dialer Profile Configuration with Multiple Dial Strings Example
Rotating Through Dial Strings
Feature History
This document describes the Rotating Through Dial Strings feature in Cisco IOS Release 12.2(8)T and includes the following sections:
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Supported Standards, MIBs, and RFCs
Feature Overview
The Cisco IOS software allows multiple dial strings (telephone numbers) to be configured for outgoing calls. In previous releases of the Cisco IOS software, the dial string used for a particular outgoing call was always the first telephone number in the dial string list. It was not possible to customize the selection or otherwise participate in deciding which dial string should be used first. But in Cisco IOS Release 12.2(8)T, the Rotating Through Dial Strings feature allows the order in which dial strings should be dialed to be specified.
Benefits
The Rotating Through Dial Strings feature allows you to specify the dialing order when multiple dial strings are configured. Options for dialing order are as follows:
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This feature takes advantage of information available from a previous call attempt, such as the call was unsuccessful or the line was busy, and thereby increases the rate of successful calls.
Related Documents
Additional information about configuring networks that can take advantage of the Rotating Through Dial Strings feature can be found in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2. Refer to the chapter "Configuring Peer-to-Peer DDR with Dialer Profiles" in the part "Dial-on-Demand Routing Configuration." In the same manual, also refer to the chapter "Configuring ISDN Caller ID Callback," in the part "Callback and Bandwidth Allocation Configuration."
Supported Platforms
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Determining Platform Support Through Feature Navigator
Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.
Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Feature Navigator home page at the following URL:
Supported Standards, MIBs, and RFCs
Standards
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MIBs
None
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
None
Prerequisites
The Rotating Through Dial Strings feature is used in configurations that apply to both legacy dialers and dialer profiles. The dialing order you configure applies to dial strings configured on an interface by the dialer string and dialer map configuration commands. See the documents listed in the "Related Documents" section for more information about using these commands to configure dial strings.
Configuration Tasks
See the following sections for the configuration tasks for this feature. Each task in the list is identified as either required or optional.
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Configuring the Order of Dial Strings
To specify the order in which dial strings should be dialed, use the following command in interface configuration mode:
The dialer order command keywords can be configured on a per-interface basis. You can use this command in interface configurations that apply to both legacy dialers and dialer profiles. See the "Configuration Examples" section to see how this command is used with both these dialer types.
Verifying Dial String Order
To verify that the dial string order is configured correctly, perform the following step:
Step 1
Router# show running-config interface dialer 1Building configuration...Current configuration : 96 bytes!interface Dialer1no ip addressdialer pool 1dialer order round-robinno cdp enableendCheck that a dialer order command is listed in the configuration displayed. If no dialer order command is listed, that indicates the default sequential dial string order is configured.
Step 2
Router# show isdn history
Troubleshooting Tips
To troubleshoot the Rotating Through Dial Strings feature, use the debug dialer command in privileged EXEC mode.
Monitoring and Maintaining the Rotating Through Dial Strings Feature
To monitor and maintain the Rotating Through Dial Strings feature, use the EXEC commands included in the steps in the "Verifying Dial String Order" section.
Configuration Examples
This section provides the following configuration examples:
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Legacy Dialer with Multiple Dial Strings Example
The following example configures the dialing software to try the telephone number (dial string) of the last successful call when starting a new call, rather than the first telephone number in the list:
interface Serial0/0ip address 10.2.1.130 255.255.255.0encapsulation pppdialer in-banddialer map ip 10.2.1.131 name jones1 modem-script test 5554004dialer map ip 10.2.1.131 name jones1 modem-script test 5554005dialer map ip 10.2.1.131 name jones1 modem-script test 5554006dialer-group 1dialer order last-successfulDialer Profile Configuration with Multiple Dial Strings Example
The following example configures the dialing software to try the telephone number following the most recently used telephone number (dial string) when starting a new call, rather than the first telephone number in the list:
interface Dialer0ip address 10.1.1.130 255.255.255.0encapsulation pppdialer pool 1dialer string 1904dialer string 1905dialer-group 1dialer order round-robinCommand Reference
This section documents the new dialer order command. All other commands used with this feature are documented in the Cisco IOS Release 12.2 command reference publications.
dialer order
To specify the dialing order when multiple dial strings are configured, use the dialer order command in interface configuration mode. To change or remove the dialing order, use the no form of this command.
dialer order [sequential | round-robin | last-successful]
no dialer order [sequential | round-robin | last-successful]
Syntax Description
Defaults
Dial order is sequential.
Command Modes
Interface configuration
Command History
Usage Guidelines
The dialer order command keywords can be configured on a per-interface basis. The configuration rules are as follows:
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You can use the dialer order command in configurations that apply to both legacy dialers and dialer profiles. The command is also compatible with the following dialer features and protocols:
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Examples
The following legacy dialer configuration shows how to set the dialing software to try the telephone number of the last successful call when starting a new call, rather than the first telephone number in the list (555-4004):
interface Serial0/0ip address 10.2.1.130 255.255.255.0encapsulation pppdialer in-banddialer map ip 10.2.1.131 name jones1 modem-script scr-3 5554004dialer map ip 10.2.1.131 name jones1 modem-script scr-3 5554005dialer map ip 10.2.1.131 name jones1 modem-script scr-3 5554006dialer-group 1dialer order last-successfulIf in a previous attempt to dial network 10.2.1.131 the telephone number 555-4006 was successful, because the dial order is set to last-successful, the next attempt to dial network 10.2.1.131 will start again with the 555-4006 telephone number.
The following dialer profile configuration shows how to set the dialing software to try the telephone number that occurs after the most recently used dial string when starting a new call, rather than the first telephone number in the list (1904):
interface Dialer0ip address 10.1.1.130 255.255.255.0encapsulation pppdialer pool 1dialer string 1904dialer string 1905dialer string 1906dialer string 1907dialer-group 1dialer order round-robinIf in a previous attempt to dial network 10.1.1.130 the telephone number 1906 was successful, because the dial order is set to round-robin, the next attempt to dial network 10.1.1.130 will start with the 1907 telephone number.
Related Commands