[Freeswitch-users] call transfer question

I have a call scenario that involves transferring the call and dropping out of the SIP/RTP stream. I need to accept the SIP call, play a prompt, and retrieve a pin code. After a database lookup, I need to transfer the call to another FS server and drop out of the SIP path. I have done this with the RTP media stream previously. I am not sure what I need to do to drop out of the SIP path. Is this possible on FS? Jonathan