asterisk users - Oct 2005 - Disconnecting after 1 min while Communicating Clarent class 5 call manager

Hi List
I installed asterisk server and tried to transfer calls from asterisk to
Clarent class 5 call manager.
The calls are passing through with out any problem but after 60 seconds the
call get disconnected automatically.
Please help me to sort out this problem. Attaching here with my sip
configuration file

Sip.conf.............................
[general]
rtpholdtimeout=300
rtptimeout=300
defaultexpirey=20
context=default
port=5060
bindaddr=0.0.0.0 <http://0.0.0.0>
srvlookup=yes

[clarent]
register => test:testing@192.168.10.150/123456
type=friend
secret=1234
username=testuser
host=192.168.10.150 <http://192.168.10.150>
fromuser=test1234
insecure=very
fromdomain=192.168.10.150 <http://192.168.10.150>
canreinvite=no
nat=no
disallow=all
allow=g723
context=default


Thanks in advance.

Anil
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