[reSIProcate] how to add custom field to refer message

["maodonghu" <hhmmdd@xxxxxxx>]

resip

I wanna add some associate data in refer message to do transfer call, how can I 
do to add these data to refer message?

Resip seems only provide a interface refer(...) in InviteSession


I hope you can understand me
                                

　　　　　　　　maodonghu
　　　　　　　　hhmmdd@xxxxxxx
　　　　　　　　　　2006-09-19