Hi Reeja,
Sorry to say but Your problem is fixed becuase you passed MCoptions and some state data like HT_Query .
Its my perception your both calls were not in the conference thats why you did not get any voice from you other Number.
Conclusion ==>
Makecalloption you set Conference=true
set hairpin=true
and pass conferenceid=first call confeenceId
by this both call in Conference

passing null in From do nothing ,its useless else you wanna From number info in onmakecallcomplete.
Regards,
Brajesh