Looking for a query to find first/last dates in overlapping dates...

Hi,
I'm looking for a query to find the first dates and last dates in a table conaining overlapping dates.
I have a subscription table which has for each Customer start and end date for different subscriptions.
I want to know the different ranges of date where there is subscriptions active.
so if the table has this:
CustID, Start date, end date
1, 2008-01-01, 2012-06-06
1 ,2009-01-01, 2011-01-01
1, 2011-01-01, 2013-02-02
1, 2013-01-01, 2013-08-08
1, 2014-01-01, 2014-04-04
I want to produce this result:
custid, range start, range end
1, 2008-01-01, 2013-08-08
1, 2014-01-01, 2014-04-04
the first row is the range identified from the 4 rows in my subscription table.
thanks :)

I think I found it...
http://stackoverflow.com/questions/5213484/eliminate-and-reduce-overlapping-date-ranges
let me try this method
Hi，
m writing to follow up with you on this post. Thanks for you posting a reply to share your workground. Was the problem resolved after performing the above link? If you are satisfied with the above solution, I’d like to mark this issue as "Answered".
Please also feel free to unmark the issue, with any new findings or concerns you may have.
Thanks,
Sofiya Li
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