modem question?

From: zheng jiang gu (zjgu@xxxxxxxxxx)
Date: Wed May 31 2000 - 11:59:19 GMT-3


   
   hi everyone:
      when I use 3com u.s.robotics modem ,I found a strange question:
   I config a 3640 with 30DM.
   when I user a telephone line ,it never works.
   when I user another telephone line ,it always work well.
   I dial isp number .
   Both works well.
   
   help me



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