>> Seems like my best long term solution will be to find a way to upgrade 
>> one of the lines (maybe by switching ISPs) and then once that line is 
>> redone, discontinue use on the line that is currently run by the 675.  
>> I could try for a 678 on ebay, but would rather not bother since the 
>> devices are EOL anyway.  Only problem will be convincing my parents 
>> who are the ones actually paying for the lines as a change of ISP 
>> would mean a change of email addresses.
> 
> 
> Actually, when changing ISPs, Qwest will not change out your CAP circuit 
> for a DMT circuit at the Central Office.  They will simply reroute your 
> DSL virtual circuit to the new ISP.  Qwest should be able to replace 
> your circuit with DMT without changing your ISP, but be prepared to pay 
> for it.  Your best bet is to contact your ISP.  They will have more 
> influence and contacts at Qwest to get it done.  Good luck.

I already have one CAP and one DMT circuit.  So, the DMT circuit gets a new ISP 
and the CAP circuit gets turned off.