The Cisco Access Registrar 5.1 has been retired and is no longer supported.
End-of-Sale Date: 2013-11-28
End-of-Support Date: 2016-11-29
Cisco's End-of-Life Policy
You can view a listing of available Cloud and Systems Management offerings that best meet your specific needs
If you want support information for the Cisco Access Registrar 5.1 documentation, it may be available through Cisco.com Search or in the Cisco Community