asterisk users - Sep 2010 - ISDN BRI call disconnection issue

Hi,

 I have a Netmod ISDN BRI router and from the router I have connected the
analog port in Asterisk via FXO card. Two analog lines I have connected to
asterisk machine. When both the lines are established, after 31 minutes the
call is automatically disconnected.

While checking the log it shows as busy tone is detected because of this
existing call is disconnected.

Did anybody faced this kind of issue. Also some assistance would be much
appreciated.

-- 
Thank you  with regards,
Gopalakrishnan A.N,
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