asterisk users - Sep 2010 - Calls stuck in the queue even when ext's are available

Hi..

We are facing a problem that is making the channel to be stuck. we are using
asterisk 1.4.22.1 version, and we have a direct sip trunk...We have 2 queues
and one has 2 agents and the other 5 agents, from last week the second
queue's channel is getting stuck, it happened 3 times till now and the
problem is calls come into the queue and just the calls will be in the queue
and will not ring any agents (static) even when are available......so when i
went to the CLI and saw few channels were stuck:

SIP/5060-b6517170    8002 at ext-queues:11   Up      Queue(8002|t||)
SIP/5060-b6511070    8002 at ext-queues:11   Up      Queue(8002|t||)
SIP/5060-b6515be0    8002 at ext-queues:11   Up      Queue(8002|t||)
SIP/5060-0854ba80    8002 at ext-queues:11   Up      Queue(8002|t||)
SIP/5060-08584ad0    8002 at ext-queues:11   Up      Queue(8002|t||)

Even when i did "soft hangup" it did not hangup....so i had to kill
the
asterisk process and had to restart it......i was researching and found that
there is "autofill=yes" option that i am going to try it.....please
share if
you have any thoughts in regards to the queue problem.......

Thank you very much

Regards
Sandesh
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