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Dial Solutions Command Reference
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About the Cisco IOS Software Documentation
- Part 1: Dial-In Port Setup
- Part 2: Dial-In Terminal Service and Remote Node Configuration
- Part 3: Dial-On Demand Routing
- Part 4: Dial Backup
- Part 5: Dial-Out Modem Pooling
- Part 6: Large-Scale Dial Solutions
- Part 7: Cost-Control Solutions
- Part 8: Virtual Private Dialup Networks
- Part 9: Other Network Traffic on ISDN Channels
- Part 10: Dial-Related Addressing Services
- Part 11: Appendixes
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Table Of Contents
Asynchronous Callback Commands
Asynchronous Callback Commands
This chapter describes the commands used to configure the Cisco IOS software to call back an asynchronous device that dials in and requests a callback from the router, then disconnects.
For configuration tasks and examples, refer to the chapter "Configuring Asynchronous Callback" in the Dial Solutions Configuration Guide.
arap callback
To enable an ARA client to request a callback, use the arap callback global configuration command.
arap callback
Syntax Description
This command has no arguments or keywords.
Default
Callback requests are not accepted on lines configured for ARA.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
This command enables the router to accept callback requests from ARA clients. You first have to enable AppleTalk routing on the router and then enable automatic ARA startup on the line. You can use this command with either local username authentication or TACACS+ authentication.
Example
The following example accepts a callback request from an ARA client:
arap callbackRelated Commands
You can use the master indexes or search online to find documentation of related commands.
arap authentication
autoselect ara
callback forced-wait
ppp authentication
ppp callback
service exec-callback
usernamecallback forced-wait
To force the Cisco IOS software to wait before initiating a callback to a requesting client, use the callback forced-wait global configuration command.
callback forced-wait
Syntax Description
This command has no arguments or keywords.
Default
The forced waiting period is not set.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
Use this command when the router is calling back a modem that initiated a call, then dropped the connection, but requires a rest period before subsequent input is accepted.
Example
The following example sets a waiting period during which a callback chat script is delayed from being sent on an outgoing target line:
callback-forced-waitRelated Commands
You can use the master indexes or search online to find documentation of related commands.
arap callback
chat-script
debug callback
ppp callback
service exec-callback
usernameppp callback
To enable a PPP client to dial into an asynchronous interface and request a callback, use the ppp callback interface configuration command.
ppp callback {accept | initiate}
Syntax Description
accept
Accept callback requests from RFC1570-compliant PPP clients on the interface.
initiate
Initiate a callback to non-RFC1570-compliant PPP clients dialing in to an asynchronous interface.
Default
Callback requests are not accepted on asynchronous interfaces.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.0.
This command enables the Cisco IOS software to accept callback requests entering asynchronous interfaces configured for PPP callback. PPP callback can only be initiated if the interface is configured for authentication using CHAP or PAP.
Examples
The following example accepts a callback request from an RFC-compliant PPP client:
ppp callback acceptThe following example accepts a callback request from a non-RFC-compliant PPP client:
ppp callback initiateRelated Commands
You can use the master indexes or search online to find documentation of related commands.
arap callback
autoselect ppp
callback-forced-wait
ppp authentication
usernamescript arap-callback
To specify that a chat script start on a line any time an AppleTalk Remote Access (ARA) client requests a callback, use the script arap-callback line configuration command. Use the no form of this command to disable this feature.
script arap-callback regexp
no script arap-callbackSyntax Description
regexp
Regular expression that specifies the set of modem scripts that might be executed. The first script name that matches the argument regexp is used.
Default
Not assigned to terminal lines
Command Mode
Line configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
This command specifies that if an originating ARA client requests callback, the device will be disconnected and the chat script defined by the argument regexp will be executed to call back the client. The first available line specified for callback, and for which a chat script has been applied, will be used for the callback.
Create a chat script using the chat script command.
The script arap-callback command functions only on physical terminal (TTY) lines. It does not function on virtual terminal (VTY) lines.
Example
The following example specifies that a chat script with a name that includes usr4 will be activated whenever a client requests a callback on line 4:
line 4 script arap-callback usr4Related Commands
You can use the master indexes or search online to find documentation of related commands.
chat-script
script activation
script callback
script connection
script dialer
script reset
script startup
start-chatscript callback
To specify that a chat script start on a line any time a client requests a callback, use the script callback line configuration command. Use the no form of this command to disable this feature.
script callback regexp
no script callbackSyntax Description
regexp
Regular expression that specifies the set of modem scripts that might be executed. The first script name that matches the argument regexp is used.
Default
Not assigned to terminal lines
Command Mode
Line configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
This command specifies that if an originating client requests callback, the device will be disconnected and the chat script defined by the argument regexp will be executed to call back the client. The first available line specified for callback, and for which a chat script has been applied, will be used for the callback.
Create a chat script using the chat script command.
The script callback command functions only on physical terminal (tty) lines. It does not function on virtual terminal (vty) lines.
Example
The following example specifies that the chat script with a name that includes supra4 will be activated whenever a client requests a callback on line 4:
line 4 script callback supra4Related Commands
You can use the master indexes or search online to find documentation of related commands.
chat-script
script activation
script connection
script dialer
script reset
script startup
start-chatservice exec-callback
To enable the Cisco IOS software to call back clients who request a callback from the EXEC level, use the service exec-callback global configuration command.
service exec-callback
Syntax Description
This command has no arguments or keywords.
Default
Callback is not enabled.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
This command enables the Cisco IOS software to return a call to a device that dials in, connects to the EXEC, and requests callback.
Example
The following example enables EXEC level callback:
service exec-callbackRelated Commands
You can use the master indexes or search online to find documentation of related commands.
arap callback
callback forced-wait
debug callback
debug confmodem
ppp callback
username