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 (2.6.2.2 or 2.6.2.3) 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,
wendy