[nsp] dial in disconnection

[arun yadav yadav]

Hi All,
  I m having a CISCO 3640 dial up remote access router in my 
office.I m facing a problem in that.
  Users dial into this router & remain connected only for 15-20 
minutes & after that they are getting disconnected automatically & 
have to dial in again.This disconnection is happening after every 
15-20 minutes.
  Authentication is being done through RADIUS.
  Kindly suggest some solution to this problem or some document 
which might help in the same.

Thanks & Regards
Arun
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