Difference between Cisco 2800 and 2900 series of routers

I have a bunch of 2811's in my MPLS network.  At one site where I have 3 bonded T1's I have a 2821.  At the site where I have one T1 currently I have a brand new 1841.  I'd like to add another T1 to that site for a total of 2.  When I got my quote from Sprint they wanted me to get a 2901 router.  Why?  
It's just a data T1, no break out of voice on those.

Does anyone know the exact differences and maybe their logic behind this?
LVL 12
atrevidoAsked:
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WissamSenior Network EngineerCommented:
The 1841 supports two WIC Cards as you can see in the below datasheet

http://www.cisco.com/en/US/prod/collateral/routers/ps5853/prod_qas0900aecd80181208.html

do you already have both of the WIC slots used ?
if not, you can buy a second wic card and use it
The 2900 series is the replacement for 2800 series
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meko72Commented:
There is really not much diffierance other the Support and protection
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