Callcounter problem in asterisk-1.8.7.1

Hello,

I am running inbound callcenter using queue with dynamic members when i set callcounter=yes in sip.conf its running perfectly but after some time it does not change status of queue it make all queue member status busy.

My Sip.conf users is.

[1112]
type=friend
defaultuser=1112
secret=1234
host=dynamic
disallow=all
allow=alaw
allow=ulaw
directmedia=no
canreinvite=no
callcounter=yes
context=default