Asterisk Transfer Event

Dear All,
Now, i’m facing the problem with transfer event.
I can’t call the transfer event of Asterisk Manager API (1.4) from my program.
I would like to know, Asterisk Server ( or whether support or not the transfer event and also would like to know how to catch server transfer event from my program.
I’ve already made ‘allowtransfer=yes’ option in sip.conf [general] section.But still can’t catch.
Is there anyone who know about that please reply to me.

Thanks and Regards,