I think you should check the chapter on dialing solutions of the IOS configuration guide:

http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/prod_configuration_guide09186a008017d8e6.html

Hope this helps you out.

Regards,

Leo

Hi Majesh

DCD - This signal is output by the DCE to indicate that a valid carrier has been detected.

DTR - This signal is output by the DTE to indicate that it is ready for communication.

DSR - This signal is output by the DCE (in response to DTR) to indicate that it has been switched on and connected to the communications channel.

RTS - This signal is output by the DTE to indicate that it is ready to send data.

CTS - This signal is output by the DCE to acknowledge RTS and to indicate that it is ready for data transmission.

For troubleshooting this might help:

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a758d.shtml