Help - merging calls topic

hello everybody,
so i spent alot of time trying to find a solution to my problem:
how to automaticlly merge two calls ?
caller A - called to my phone - i am still talking to him,
caller B - called to my phone .
i would like to make conference call without touching the screen !
hoo and it is very important, i wish it to be done on not routed devices (if possible)

i was trying to call PhoneUtils.jave etc .
simulate touch event on the "merge" button.

none of those method worked for me,
so before i'll go to the final method (banging my head against the wall),
i thought- if only there was a place with smart helpful pepole-
maybe they figure it up ...

thanks alot,
roy po