Asterisk 1.8.3 100% cpu in Segate dockstar during gtalk call

I have successfully installed Asterisk 1.8.3.2 on segate Dockstat. Asterisk is stable for past 5 days.
But one thing which concerns me is , while on call using Gtalk channel, the cpu utilization is 100%.
Is there are way way to optimize the CPU utilization ?

ipkg.nslu2-linux.org/feeds/optwa … -1_arm.ipk

Any help, pointer is much appreciated.