[cisco-voip] Configuring dial-on-demand MLPP for remote site?

[Robert Kulagowski]

Is it possible to configure a 2821 or 2851 so that if the WAN link goes 
out, it steals 3 or 4 channels in a voice PRI to dial back to a RAS 
server and re-establish a data link?  The channels should only be 
allocated when necessary.

We'd like to avoid SRST as much as possible, and we haven't had the WAN 
_and_ the voice PRI go out at the same time, so it would be a nice bonus 
to get some redundancy without having to buy extra equipment / circuits.

If it's possible, then a config example would be nice.