asterisk users - Sep 2009 - unknown error ON DAHDI please help me...

dear all,

i have one issue in my DAHDI channel

while my incoming call connected it suddenly disconnected and got following
error

< Protocol Discriminator: Q.931 (8) len=9
< Call Ref: len= 2 (reference 357/0x165) (Originator)
< Message type: DISCONNECT (69)
< [08 02 82 90]
< Cause (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard (O) Spare: 0
Location: Public network serving the local user (2)
< Ext: 1 Cause: Normal Clearing (16), class = Normal Event (1) ]
-- Processing IE 8 (cs0, Cause)
q931.c:3784 q931_receive: call 357 on channel 1 enters state 12 (Disconnect
Indication)


can any one know following are my settings

system.conf

# Global data
loadzone        = us
defaultzone     = us

span = 1,0,0,ccs,hdb3
bchan = 1-15
dchan = 16
bchan = 17-31

span = 2,0,0,ccs,hdb3
bchan = 32-46
dchan = 47
bchan = 48-62


and chan_dahdi.conf

[channels]
   language=en
   context=from-pstn
   switchtype=euroisdn
   pridialplan=local
   prilocaldialplan=local
   signalling=pri_cpe
   usecallerid=yes
   hidecallerid=no
   callwaiting=yes
   usecallingpres=yes
   callwaitingcallerid=yes
   threewaycalling=yes
   transfer=yes
   cancallforward=yes
   callreturn=yes
   relaxdtmf=yes
   echocancel=no
   echocancelwhenbridged=no
   resetinterval=never
   rxgain=0.0
   txgain=0.0
   callgroup=1
   pickupgroup=1
   immediate=no
   dtmfmode=inband
   group = 0
   channel => 1-15
   channel => 17-31
   channel => 32-46
   channel => 48-62

please help

regards
Dhaval
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