Difference Between An RPO And Consultancy

Dear Seniors,
I would like to know, "what is the difference between a Recruitment Process Outsourcing(RPO) firm and a Recruitment Consultancy firm?"
Is it true that RPO firm has to get a different set of permissions from Govt. to do business when compared with Recruitment consultancy firm?
Please let me know as I am told that I cannot be given incentive for each placement i am doing becoz we're a RPO firm not a recruitment firm. How true is this?
Regards
Vijaya

Dear seniors,
Please respond back as I need to take a decision about my job.
Regards
Vijaya

Sorry friend.I really dont have any clue on he same..Pls share the info with me if you come across.
Regds/Rathish