These situations are often in the VoIP billing world. If the rate
changes during a call there is little
you can do in a prepaid billing system (in a postpaid situation this is
not a problem). You have to choose
either to bill your customer with the rate that is valid at the
beginning of the call or at the end of it. Most of the
implemantations choose to bill the customer with the rate that is valid
at the end of the call. I know
this is somewhat inconsistent because if you calculate the remaining
time with a low rate and the rate changes
during the call then you might end up with a negative credit on your
prepaid customer's balance. There is little
you can do to about that. You just have to choose one of the options
above and notify your customers
about your decision. The thing is that all this - although scary at
first sight - is somewhat balanced in the end
(fair-wise) because the probabilities that your customer can make a call
during a low-to-high rate change are
equal with the probabilities that the call follows a high-to-low rate
change. So in the end nobody really loses or wins.
You don't have to be a perl expert to use the rlm_perl module. But I can
tell you from my experience that it
gives you control of all different scenarios that may arise. Your
back-end could (usually a DB in these situations)
be as complex as you like (pricelists per customer, per time-slice, per
type, per u-name-it), and your code could
be as complex as you like (and as dynamic as you like) using a 3rd
generation language that gives the flexibility to
do whatever you want.
Alan DeKok wrote:
Saeed Akhtar wrote:
Yes I know that freeradius doesn't know whether we are charging $ 1 or
2. But the purpose of asking question was that If a user has 3 hrs left
@ $1/hr and after an hour the rate changes to 0.5/hr then technically
freeradius should reply Session-Timeout = 5hrs as (1hr @ $1/hr + 4hrs @
$0.5/hr). So may be we can create some condition to do so.
See the "expr" module. It has limited support for some math expressions.
Alan DeKok.
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