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OOB modem can't be dialin

Answered Question
Jul 29th, 2009
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I have a problem in connecting dial-up modem to AUX port of router C2821. The customer said he have connected the modem

to the AUX and connected the phone line. However, I cannot dialin via the modem and have the following message. Could

someone can help how to troubleshoot the connection ?


Router#sh line aux 0

Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int

* 1 1 AUX 115200/115200- inout - - - 0 0 0/0 -

Line 1, Location: "", Type: ""

Length: 24 lines, Width: 80 columns

Baud rate (TX/RX) is 115200/115200, no parity, 2 stopbits, 8 databits

Status: Ready, Active, No Exit Banner, CTS Raised, Modem Configuring

Modem Speed Locked, Modem Signals Polled, Autoconfig Running

Capabilities: Modem Callout, Modem RI is CD, Modem Discovery

Modem state: Ready

Modem hardware state: CTS* noDSR DTR RTS

Special Chars: Escape Hold Stop Start Disconnect Activation

^^x none - - none

Timeouts: Idle EXEC Idle Session Modem Answer Session Dispatch

00:10:00 never none not set

Idle Session Disconnect Warning


Login-sequence User Response


Autoselect Initial Wait

not set

Modem type is unknown.

Session limit is not set.

Time since activation: never

Editing is enabled.

History is enabled, history size is 20.

DNS resolution in show commands is enabled

Full user help is disabled

Allowed input transports are none.

Allowed output transports are none.

Preferred transport is telnet.

No output characters are padded

No special data dispatching characters



line aux 0

login local

modem InOut

modem autoconfigure discovery

transport output none

speed 2400


Thanks a lot

Man Leung

Correct Answer by slmansfield about 8 years 2 weeks ago

Based on the modem hardware state settings it looks like the modem is connected to the aux port.

Here's an example of how to configure the router to be used for dialin to an exec via the aux port of the router. HTH


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