Hi - My customer has had a NM-4E1-IMA working in a 2800 router fine;Cisco IOS Software, 2800 Software (C2800NM-ENTSERVICESK9-M), Version 12.4(4)T, RELEASE SOFTWARE (fc1)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2005 by Cis...