Need Help Asterisk -> Gtalk with G723 Codec

Hello

I want to use asterisk to connect sip calls to google talk. I can use it very well with ilbs and ulaw codecs. but when I force to use G723, it doesnt work.
when I send a G723 call to google, the machine which is running google yalk client experience a crash on google talk, and gtalk terminates.

I’m using the latest asterisk stable version (Asterisk 1.4.15) , with G723 codec installed.
also using the latest google talk software from google.

any one has a solution ?

thanks

Reza Toghraee

… deleted …