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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.
To enable an ARA client to request a callback, use the arap callback global configuration command.
arap callbackThis command has no arguments or keywords.
Callback requests are not accepted on lines configured for ARA.
Global configuration
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.
The following example accepts a callback request from an ARA client:
arap callback
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
username
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-waitThis command has no arguments or keywords.
The forced waiting period is not set.
Global configuration
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.
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-wait
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
username
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}| 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. |
Callback requests are not accepted on asynchronous interfaces.
Interface configuration
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.
The following example accepts a callback request from an RFC-compliant PPP client:
ppp callback accept
The following example accepts a callback request from a non-RFC-compliant PPP client:
ppp callback initiate
You can use the master indexes or search online to find documentation of related commands.
arap callback
autoselect ppp
callback-forced-wait
ppp authentication
username
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| 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. |
Not assigned to terminal lines
Line configuration
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.
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 usr4
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-chat
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| 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. |
Not assigned to terminal lines
Line configuration
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.
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 supra4
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-chat
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-callbackThis command has no arguments or keywords.
Callback is not enabled.
Global configuration
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.
The following example enables EXEC level callback:
service exec-callback
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
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