connection from phone A to B is fine(when the asterisk is in between them).
i am pressing the FLASH button and getting again a dial tone in A , and music on B.
then i am dialing to C which is ringing .
when picking up C the transfer fails.
in the trace i can see that the last MDCX fails:
o=root 2374 2374 IN ipv4 0.0.0.0 \r\n
and of course my problem is because the asterisk sets the ip to 0.0.0.0.