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Max,Nope, no chance with 12.3 mainline. New hardware is supported in the 12.3XD and T trains first and not in mainline 12.3. You will need 12.3XD or 12.3T or if you want to run mainline you will need 12.4.Personally I don't have experience on 12.4 ma...
Hi Max,you must be running an IOS that is too old for the NM-8AM card. If it is new it probably is the NM-8AM-V2 card (with V.92 support). This one is only supported on IOS versions 12.3(4)XD or 12.3(7)T and upwards. See document in http://www.cisco....