[Freeswitch-users] How to let freeswitch make a transfer call without dialplan xml?

Hi, I want to make a transfer call on freeswitch. I use event socket to receive calls, do the calling invite logic in the program. Now I want to do the same things for transfering call. But the commands I found for transfer are all depending on dialplan xml. E.x., uuid_transfer, transfer, ..., etc. But what I want is do the transfer call without any xml, even the default. Is there any way to achieve that goal on freeswitch? Sincerely, Leo