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TODO - ISPutil package to-do list.
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As of version 0.2, the Credit Limit stuff has been commented out and callers 
cannot create their own accounts (salespeople do that for them). The 
Credit Limit stuff should be gotten back in as a make option, and perhaps 
also the ability for callers to create their own accounts should also be 
such an option.

Kayhay now wants to be able to sell people extra blocks of time for only 
some of their extra months, such as a person having 12 months prepaid but 
only getting an extra block per month for first three months. There had 
been some reason (unable to change things when a subscription is in 
effect?) why we had not been using DIal-Up_Utils subscription facility 
for this sort of thing; should we look again at possibility of using that 
facility?

