[cisco-nas] Modems not responding on cisco AS5300.

[Joseph Mays]

> From the debugs, it looks like this call into modem 2/51 simply failed
> to train.  It is possible that the DSP that handles 2/51 (and 2/50) has
> gone into some bad state; can't tell from the debugs alone.

Yeah. If you're calling it on the phone when this issue occurs, you see that 
in the debug logs but what you hear on the phone is just dead air. No modem, 
nothing.

Thanks for the suggestions, I'll try them and report what happens.