Session hangup issues - IAX

Hi ,

i see around 600 entries of this type. not sure why they are not getting cleared once the call is over. if i stop asterisk & restart they disapper temporarly. i am running 1.4.21.2 version. Please suggest.

=========================================
CLI> iax2 show netstats

                            -------- LOCAL ---------------------  -------- REMOTE --------------------

Channel RTT Jit Del Lost % Drop OOO Kpkts Jit Del Lost % Drop OOO Kpkts
(None) 5 -1 0 -1 -1 0 -1 13 0 40 0 0 0 0 0
(None) 237 -1 0 -1 -1 0 -1 0 0 40 0 0 0 0 0
(None) 243 -1 0 -1 -1 0 -1 4 0 40 0 0 0 0 0
(None) 11 -1 0 -1 -1 0 -1 7 0 40 0 0 0 0 0

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i have autokill=yes in my iax.conf

[general]
bindport=4569
trunk=yes
autokill=yes
tos=ef
disallow=all
allow=gsm
allow=g729

please suggest.

thanks
ldp